1 using earth's resources, pot. water 2 2 14 8 114 9 haber ... · 1 using earth's...

1 Using Earth's resources, pot. water 2

2 14

3 Life cycle assessment + recycling 32

4 48

5 68

6 Using materials 76

7 98

8 114

9 Haber process + use of NPK fertilizers 122

10 141

11 161

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Page 1

Using Earth’s resources; pot. water

Question Paper

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA

Topic 4.10 Using resources

Sub Topic Using Earth’s resources; pot. water

Difficulty level Bronze Level

Booklet Question Paper

Time Allowed: 28 minutes

Score: /28

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%

http://www.savemyexams.co.uk/?utm_source=PDF&utm_medium=PDF


Page 2

Q1.This question is about water.

River water needs to be treated before it is safe to drink.

(a) The diagram shows two stages of the treatment of river water.

(i) What is the name of the process used to remove solid particles in Stage 1?

Tick ( ) one box.

Crystallisation

Fermentation

Filtration

(1)

(ii) What is added in Stage 2 to sterilise the water?

Tick ( ) one box.

Chlorine

Fluoride

Potassium

(1)



Page 3

(b) Toxic substances in river water are removed by adding very small amounts of iron oxide nanoparticles.

(i) How is the size of nanoparticles different from normal-sized particles?

...............................................................................................................

............................................................................................................... (1)

(ii) Nanoparticles are needed in only very small amounts.

Suggest why.

...............................................................................................................

............................................................................................................... (1)

(c) In certain areas of the UK, tap water contains aluminium ions.

What would you see when sodium hydroxide solution is added drop by drop to tap water containing aluminium ions?

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(Total 6 marks)



Page 4

Q2.This question is about drinking water.

(a) The flow diagram below shows how water is made suitable for drinking.

(i) What is removed when the water is filtered?

Tick ( ) one box.

Gases

Liquids

Solids

(1)



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(ii) What is used to sterilise the water?

Tick ( ) one box.

Carbon

Chlorine

Sodium chloride

(1)

(iii) Why is the water sterilised?

...............................................................................................................

............................................................................................................... (1)

(b) Water can be purified by distillation.

Drinking water is not usually purified by distillation because distillation is expensive.

Complete the sentence.

Distillation is expensive because it requires a lot of

........................................................................................................................ (1)

(c) Why do some water companies add fluoride to drinking water?

........................................................................................................................

........................................................................................................................ (1)

(Total 5 marks)



Page 6

Q3.The diagram shows three stages in the treatment of reservoir water.

(a) (i) What is separated from the reservoir water during filtration?

Tick (✔) one box.

Bacteria

Dissolved nitrates

Solids

(1)

(ii) What is added to sterilise the water?

Tick (✔) one box.

Calcium

Chlorine

Magnesium

(1)



Page 7

(iii) State one advantage of adding fluoride to drinking water.

...............................................................................................................

............................................................................................................... (1)

(b) The diagram shows a water filter used in the home.

Water in

A student collected a sample of water from the filter.

The student could show that the filtered water contains dissolved salts without using a chemical test.

Describe how.

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

......................................................................................................................... (2)



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(c) Seawater is forced through a membrane to make drinking water.

Seawater

Drinking water

Suggest why water molecules can pass through the membrane, but sodium ions and chloride ions cannot.

.........................................................................................................................

......................................................................................................................... (1)

(Total 6 marks)



Page 9

Q4.Where copper ore has been mined there are areas of land that contain very low percentages of copper compounds.

One way to extract the copper is to grow plants on the land.

The plants absorb copper compounds through their roots.

The plants are burned to produce copper oxide.

The copper oxide produced from plants can be reacted to produce copper or copper sulfate solution, as shown in Figure 1.

Figure 1

(a) Draw a ring around the correct answer to complete each sentence.

(i) Copper ores contain enough copper to make extraction of the metal

carbon neutral.

economical.

reversible.

(1)

(ii) Using plants to extract metals is called

photosynthesis.

phytomining.

polymerisation.

(1)



Page 10

(iii) Copper oxide reacts with carbon to produce copper and

carbon dioxide.

oxygen.

sulfur dioxide.

(1)

(b) Copper is produced from copper sulfate solution by displacement using iron or by electrolysis.

(i) Complete the word equation.

copper sulfate + iron ...................... + ...................... (2)

(ii) Figure 2 shows the electrolysis of copper sulfate solution.

Figure 2

Why do copper ions go to the negative electrode?

...............................................................................................................

............................................................................................................... (1)

(c) Suggest two reasons why copper should not be disposed of in landfill sites.

........................................................................................................................



Page 11

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(Total 8 marks)



Page 12

Q5. Good quality water is needed for a healthy life.

In the United Kingdom, obtaining safe water for drinking is as simple as turning on a tap. The water is made safe to drink by water companies.

However, in many parts of Africa and Asia, water used for drinking is contaminated and untreated. It is estimated that 2.2 million people die each year as a result of drinking contaminated water.

DADA DANESHANANDA, Man with filtered water from the Mafi-Zongo water project. www.amurt.net/africa/ghana/2005

(a) Sea water is not used as drinking water.

Suggest why.

....................................................................................................................................

.................................................................................................................................... (1)

(b) Explain why water for drinking is filtered and then treated with chlorine.

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

.................................................................................................................................... (2)

(Total 3 marks)



Page 1

Using Earth’s resources; pot. water

Question Paper 1

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA


Sub Topic Using Earth’s resources; pot. water

Difficulty level Silver Level

Booklet Question Paper - 1


Score: /55

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1.Water from a lake in the UK is used to produce drinking water.

(a) What are the two main steps used to treat water from lakes?

Give a reason for each step.

Step 1 ................................................................................................................

Reason .............................................................................................................

Step 2 ...............................................................................................................

Reason ............................................................................................................. (2)

(b) Explain why it is more difficult to produce drinking water from waste water than from water in lakes.

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

............................................................................................................................. (3)

(c) Some countries make drinking water from sea water.

Complete the figure below to show how you can distil salt solution to produce and collect pure water.

Label the following: • pure water • salt solution



Page 3

(3)

(d) How could the water be tested to show it is pure?

Give the expected result of the test for pure water.

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

............................................................................................................................. (2)

(e) Why is producing drinking water from sea water expensive?

.............................................................................................................................

............................................................................................................................. (1)

(Total 11 marks)



Page 4

Q2.Water in Britain is taken from reservoirs to use as drinking water.

© KatieJonesPhotography/iStock/Thinkstock

(a) What are the two main steps used to treat water from reservoirs?

Give one reason for each step.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (4)

(b) Some people use water filters to treat water before drinking it.

(i) Water filters remove hardness from hard water.

What is in water filters that removes hardness from water?

...............................................................................................................

...............................................................................................................



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(1)

(ii) Suggest why water filters used in the home contain particles of silver.

...............................................................................................................

............................................................................................................... (1)

(c) Pure water can be produced by distillation.

Why is distillation not usually an economic method of treating water for drinking?

........................................................................................................................

........................................................................................................................ (1)

(d) Drinking hard water has health benefits.

State one health benefit of drinking hard water.

........................................................................................................................

........................................................................................................................ (1)

(Total 8 marks)



Page 6

Q3.Most water contains dissolved compounds.

The concentrations of these dissolved compounds are higher in sea water than in drinking water.

(a) (i) Draw a ring around the correct answer to complete the sentence.

Pure water can be obtained from sea water by

distillation.

filtration.

neutralisation.

(1)

(ii) What is the boiling point of pure water? ................................... °C (1)

(b) A student wanted to find out how much solid was dissolved in sea water.

This is the method the student used:

• measure the mass of an empty evaporating basin • measure 25 cm3 of sea water and pour it into the evaporating basin • heat the evaporating basin gently until all of the water has evaporated • measure the mass of the evaporating basin containing the solid residue.

(i) What piece of apparatus would be suitable for measuring 25 cm3 of sea water?

............................................................................................................... (1)

(ii) How could the student check that all of the water had evaporated?

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)



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(iii) The results the student obtained using 25 cm3 of sea water are:

mass of empty evaporating basin = 23.21 g mass of evaporating basin and dry solid residue = 24.04 g

Calculate the mass of solid dissolved in 1000 cm3 of the sea water.

...............................................................................................................

...............................................................................................................

...............................................................................................................

Mass dissolved in 1000 cm3 = ............................ g (2)

(c) In many countries chlorine is added to drinking water supplies.

Why is chlorine added to drinking water?

.........................................................................................................................

......................................................................................................................... (1)

(d) In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate.

Compounds containing fluoride ions are added to some drinking water supplies.

Many scientists have done research into the effects of fluoride ions in drinking water.

Graphs 1, 2 and 3 show some of the results obtained.



Page 8



Page 9

Evaluate the advantages and disadvantages of adding fluoride ions to drinking water.

You should support your answer with evidence from all three graphs.

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................

.........................................................................................................................



Page 10

.........................................................................................................................

......................................................................................................................... (6)

(Total 14 marks)



Page 11

Q4.Metals are extracted from their ores.

Many copper ores contain only 2% of copper compounds.

(a) Copper is now extracted from ores containing a low percentage of copper compounds.

Suggest two reasons why.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(b) Chalcocite, an ore of copper, contains copper sulfide.

The flow diagram shows how copper metal is extracted from chalcocite.

(i) Suggest one reason why it is difficult to dispose of the waste rock.



Page 12

...............................................................................................................

............................................................................................................... (1)

(ii) The reaction in the furnace could cause environmental pollution. Explain how.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(iii) The extraction of pure copper is expensive. Give one reason why.

...............................................................................................................

............................................................................................................... (1)

(iv) Pure copper is produced by electrolysis of copper sulfate solution.

Which electrode do the copper ions move towards? Give a reason for your answer.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(v) Large areas of land are contaminated with copper compounds. Phytomining can be used to remove these copper compounds from the land.



Page 13

What is used in phytomining to remove copper compounds from the land?

...............................................................................................................

............................................................................................................... (1)

(Total 9 marks)



Page 14

Q5. Good quality water is essential for life.

(a) In the United Kingdom, water is filtered and treated with chlorine to make it safe to drink.

Explain why the water is:

filtered ............................................................................................................

........................................................................................................................

treated with chlorine. .....................................................................................

........................................................................................................................ (2)

(b) Millions of people in Bangladesh drink water from wells that contain high levels of arsenic. Arsenic is poisonous.

The World Health Organisation recommends that there should be no more than 0.01 mg of arsenic per litre in drinking water.

The table gives some information about two instrumental methods of testing for arsenic.

Factor to consider Laboratory Instrumental Method

Portable Instrumental Method

Cost of equipment £10 000 £50

Skill level of technician

Highly skilled where test is done

Little training needed

Laboratory only Anywhere

Time to prepare the instrument for the test

5 minutes 10 seconds



Page 15

Sensitivity of the instrument

0.000001 mg of arsenic per litre of water

0.1 mg of arsenic per litre of water

(i) Use the information in the table to give two advantages and one disadvantage of using the Portable Instrumental Method compared with the Laboratory Instrumental Method.

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (3)

(ii) The information about these two instrumental methods was provided by the Professional Institute of Water Engineers (PIWE). The Institute has no connection with the companies that make these instruments.

Suggest why many people would accept the views of PIWE rather than the views of the companies that make the instruments.

...............................................................................................................

............................................................................................................... (1)

(Total 6 marks)



Page 16

Q6. Read the following information and then answer the questions.

Chlorine – for better, for worse?

Chlorine is used to make bleaches, plastics and medicines. Swimming pool water is often treated with chlorine.

Chlorine is used to make water safe to drink. It is relatively cheap and easy to use. People who drink untreated water risk dying from typhoid and cholera.

However, chlorine is a poisonous chemical. It causes breathing difficulties and can kill people. Some people are also allergic to chlorine.

(a) How does chlorine make water safe to drink?

........................................................................................................................

........................................................................................................................ (1)

(b) The amount of chlorine in swimming pool water should be carefully monitored and controlled.

Explain why.

........................................................................................................................

........................................................................................................................

........................................................................................................................



Page 17

........................................................................................................................ (2)

(c) Developing countries are likely to choose chlorination as their method of making water safe to drink.

Suggest why.

........................................................................................................................

........................................................................................................................

........................................................................................................................ (1)

(d) A government is setting up an enquiry into the safety of using chlorine.

(i) Suggest why people from all political parties should be represented.

...............................................................................................................

...............................................................................................................

............................................................................................................... (1)

(ii) Suggest why the opinion of a well-respected scientist might change the outcome of any discussion.

...............................................................................................................

...............................................................................................................

............................................................................................................... (1)

(iii) The decision taken about the safety of using chlorine should be based on evidence and data rather than on hearsay and opinion.

Suggest why.



Page 18

...............................................................................................................

...............................................................................................................

............................................................................................................... (1)

(Total 7 marks)



Page 1

Life cycle assessment + recycling Question Paper

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA


Sub Topic Life cycle assessment + recycling




Score: /42

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1.Copper is a transition metal.

(a) (i) Where is copper in the periodic table?

Tick ( ) one box.

in the central block

in Group 1

in the noble gas group

(1)

(ii) What is a property of copper?

Tick ( ) one box.

breaks easily

conducts electricity

does not conduct heat

(1)

(b) Copper ores are quarried by digging large holes in the ground, as shown in Figure 1.



Page 3

© photllurg/iStock/Thinkstock

Give two reasons why quarrying is bad for the environment.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(c) Some copper ores contain only 2% copper.

Most of the ore is rock that is not needed.

In one ore, the main compound is copper carbonate (CuCO3).

Figure 2 shows the stages used in the extraction of copper from this ore.



Page 4

(i) Why is Stage 2 important?

...............................................................................................................

............................................................................................................... (1)

(ii) The equation for the reaction in Stage 3 is:

2 CuCO3 + C 2 Cu + 3 CO2

From the symbol equation, a company calculated that 247 tonnes of copper carbonate are needed to produce 127 tonnes of copper and 132 tonnes of carbon dioxide are released.

Calculate the mass of carbon needed to make 127 tonnes of copper.

...............................................................................................................

............................................................................................................... (2)

(iii) Suggest one reason why it is important for the company to calculate the mass of



Page 5

reactants in Stage 3.

...............................................................................................................

............................................................................................................... (1)

(Total 8 marks)



Page 6

Q2. Iron is the main structural metal used in the world.

(a) The diagram represents the particles in iron, Fe.

Draw a ring around the correct word in the box to complete the sentence.

Iron is described as an element because all the

atoms

compounds

metals

are the same.

(1)

(b) Stainless steel is mostly iron.

The diagram represents the particles in stainless steel.

Use the correct words from the box to complete the sentences about alloys.

metal mixture molecule polymer smart structure

Stainless steel is an alloy because it is a ........................................................................... of iron, chromium and nickel.

An alloy is made up of more than one type of ................................................................ .



Page 7

Stainless steel alloys are harder than iron because the different sized atoms added change

the ............................................................................... .

An alloy that can return to its original shape after being deformed is called a

..................................................................... alloy. (4)

(c) In the UK, we use about 1.8 billion steel cans every year but only 25% are recycled. Used steel cans are worth about £100 per tonne.

Recycling saves raw materials and reduces waste that would end up in landfill. Producing steel by recycling used cans saves 75% of the energy that would be needed to produce steel from iron ore. This also reduces carbon dioxide emissions.

(i) Give two reasons, from the information above, to explain why recycling used steel cans is a good idea.

1 ........................................................................................................................

...........................................................................................................................

2 ........................................................................................................................

........................................................................................................................... (2)

(ii) Suggest how the local council could increase the percentage of used steel cans that are recycled.

...........................................................................................................................

........................................................................................................................... (1)

(Total 8 marks)



Page 8

Q3. Crude oil is used to make useful substances such as alkenes and plastics.

(a) The alkene shown is ethene.

(i) Tick ( ) the correct formula for ethene.

Formula ( )

CH4

C2H4

C2H6

(1)

(ii) Tick ( ) the name of the plastic formed when many ethene molecules join together.

Name of plastic ( )

Poly(ethene)

Poly(ethanol)

Poly(propene)

(1)

(b) Read the article about plastics and then answer the questions.

THE PROBLEM WITH PLASTIC WASTE



Page 9

The UK produces about 3 million tonnes of plastics from crude oil every year.

Most of the litter found on UK beaches is plastic waste.

80% of the plastics produced end up in landfill sites.

The UK recycles only 7% of plastic waste.

(i) Draw a ring around the correct answer in the box to complete the sentence.

Litter that is plastic waste needs to be removed from beaches

because it

decomposes

is flammable

is not biodegradable

.

(1)

(ii) Suggest a problem caused by 80% of the plastics going to landfill sites.

...........................................................................................................................

........................................................................................................................... (1)

(iii) The UK government has set a target to recycle 30% of plastic waste.

How are resources saved by recycling more plastics?

...........................................................................................................................

........................................................................................................................... (1)

(Total 5 marks)



Page 10

Q4. Plastics are used to make many everyday items, such as the body of the kettle.

(a) Complete the sentences by drawing a ring around the correct words.

(i) The plastic is made from many small molecules called

catalysts

monomers

polymers

(1)

(ii) Propene is produced by cracking some of the fractions that are

separated from

crude oil

limestone

metal ores

(1)

(b) After a few years the kettle no longer worked.

• Some parts of the kettle are made of plastic.



Page 11

• Some parts of the kettle are made of stainless steel. • The owner of the kettle disposed of it in a landfill site.

Consider these statements.

Suggest three reasons why the kettle should not be disposed of in a landfill site.

1 .................................................................................................................................

....................................................................................................................................

2 .................................................................................................................................

....................................................................................................................................

3 .................................................................................................................................

.................................................................................................................................... (3)

(Total 5 marks)



Page 12

Q5. Tablet containers are often made from two different polymers.

(a) Ethene, C2H4, and propene, C3H6, can be made from crude oil.

(i) Complete the following sentence.

Ethene and propene are called hydrocarbons because they are made up of carbon

and ..................................................... atoms only. (1)

(ii) Ethene molecules are used to form poly(ethene) molecules.

Complete the diagram to show the poly(ethene) molecule.

Ethene molecules Poly(ethene) molecule

(2)

(b) The tablet containers could be disposed of in a landfill site or could be recycled.

(i) Suggest two reasons why disposing of the tablet containers in a landfill site could cause problems.



Page 13

1 .......................................................................................................................

..........................................................................................................................

2 .......................................................................................................................

.......................................................................................................................... (2)

(ii) Suggest one reason why recycling the tablet containers would be difficult.

.......................................................................................................................

....................................................................................................................... (1)

(Total 6 marks)



Page 14

Q6. Polymers are used to make many materials that people need.

(a) Plastic bags are used to carry, protect and store food. Plastic bags are made from polymers.

(i) Ethene is the small molecule (the monomer) used to make the polymer for this plastic bag.

Name the polymer that is made from ethene.

........................................................................................................................... (1)

(ii) Use the correct word from the box to complete the sentence about ethene.

condensing corroding cracking

Ethene is made by breaking down large hydrocarbon molecules into smaller

hydrocarbon molecules by a process called ..................................................... (1)

(iii) The hydrocarbon ethene has the formula C2H4



Page 15

Complete the sentence about ethene.

Ethene is a hydrocarbon made up of carbon and .......................................... atoms. (1)

(b) The hydrocarbons used to make ethene come from crude oil. The properties of hydrocarbons are linked to the number of carbon atoms in their molecules.

Number of carbon atoms 5 6 7 8 9

Boiling point in °C 36 69 99 125 151

(i) Use the data in the table to complete the bar chart.

(2)

(ii) What happens to the boiling point of a hydrocarbon as the number of carbon atoms increases?

........................................................................................................................... (1)



Page 16

(iii) All the hydrocarbons in the table are found in petrol. Petrol is one of the fractions separated from crude oil.

Describe how the fractions are separated from crude oil.

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................

........................................................................................................................... (2)

(c) Most plastic bags that are made of hydrocarbons are not biodegradable.

Used plastic bags can be:

• dumped into large holes, which is called landfill

• burned to give out heat energy, which would produce large amounts of gases.

Would burning used plastic bags be better for the environment than dumping them in landfill?

Explain your answer.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (2)

(Total 10 marks)



Page 1

Life cycle assessment + recycling Question Paper 1

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA






Score: /56

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1.Plastic and glass can be used to make milk bottles.

The figure below shows the percentage of milk bottles made from glass between 1975 and 2010.

(a) Plot the points and draw a line on the figure above to show the percentage of milk bottles made from materials other than glass between 1975 and 2010.

(3)

(b) The table below gives information about milk bottles.

Glass milk bottle Plastic milk bottle

Raw materials Sand, limestone, salt Crude oil

Bottle material Soda-lime glass HD poly(ethene)

Initial stage in production of bottle material

Limestone and salt used to produce

sodium carbonate.

Production of naphtha fraction.

Maximum temperature in production process

1600 °C 850 °C

Number of times bottle can be used for

25 1



Page 3

milk

Size(s) of bottle 0.5 dm3 0.5 dm3, 1 dm3, 2 dm3, 3 dm3

Percentage (%) of recycled material used in new bottles

50 % 10 %

Evaluate the production and use of bottles made from soda-lime glass and those made from HD poly(ethene).

Use the information given and your knowledge and understanding to justify your choice of material for milk bottles.

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

............................................................................................................................. (6)

(Total 9 marks)



Page 4

Q2.Cans for food and drinks are made from steel or aluminium.The main metal in steel is iron.

By Sun Ladder (Own work) [CC-BY-SA-3.0 or GFDL], via Wikimedia Commons

(a) Iron is extracted by heating a mixture of iron oxide and carbon in a blast furnace.

(i) Name this type of reaction.

............................................................................................................... (1)

(ii) Balance the symbol equation for this reaction.

2Fe2O3 + ........... C → ........... Fe + ........... CO2 (1)

(b) Aluminium ore, bauxite, contains aluminium oxide, iron oxide and silicon dioxide. Aluminium is extracted by electrolysis of aluminium oxide.



Page 5

The 'red mud' which is dumped in very large ponds contains:

Name of solid Percentage (%)

Aluminium oxide 10

Iron oxide 65

Silicon dioxide 25

(i) 100 tonnes of bauxite produced 50 tonnes of pure aluminium oxide and 50 tonnes of 'red mud'.

What percentage of aluminium oxide did the bauxite contain?

...............................................................................................................

Answer = .......................................... %



Page 6

(1)

(ii) Apart from the solids shown in the table, name one other substance that would be in the 'red mud'.

............................................................................................................... (1)

(iii) The purification of the aluminium oxide is usually done near to the bauxite quarries.

Suggest one reason why.

............................................................................................................... (1)

(c) Aluminium is used to make many things including cans.

During one year in the USA:

• 100 billion aluminium cans were sold

• 55 billion aluminium cans were recycled.

Give one environmental impact of recycling aluminium cans and one ethical or social impact of recycling aluminium cans.

Environmental ...............................................................................................

........................................................................................................................

Ethical or social .............................................................................................

........................................................................................................................ (2)

(Total 7 marks)



Page 7

Q3. The flow diagram shows the main stages used to extract a metal from its ore.

mining the ore → purifying the ore → extracting the metal

The table shows some information about three metals.

Metal Metal ore Purified ore % of metal in the ore

% of metal in the Earth’s crust

aluminium bauxite aluminium oxide, Al2O3 28.0 8.0

copper chalcocite copper sulfide, Cu2S 0.5 0.001

iron haematite iron oxide, Fe2O3 29.0 5.0

(a) Use the information in the table and your knowledge and understanding to help you to answer the questions.

(i) Suggest why purifying the copper ore produces large quantities of waste.

...............................................................................................................

...............................................................................................................

............................................................................................................... (1)

(ii) Suggest why the annual world production of iron is forty times greater than that of aluminium.

...............................................................................................................

...............................................................................................................

............................................................................................................... (1)

(b) Aluminium is used for drinks cans. Aluminium is extracted from its purified ore by electrolysis.



Page 8

(i) Suggest why the aluminium produced in the electrolysis cell is a liquid.

...............................................................................................................

............................................................................................................... (1)

(ii) In this electrolysis, aluminium and oxygen gas are produced from the aluminium oxide.

Use the information in the diagram to suggest why most of the waste gas is carbon dioxide and not oxygen.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(iii) Aluminium is the most abundant metal in the Earth’s crust.

Suggest two reasons why we should recycle aluminium drinks cans.

1 .............................................................................................................

...............................................................................................................

2 ............................................................................................................



Page 9

............................................................................................................... (2)

(Total 7 marks)



Page 10

Q4. Iron is produced by reacting a mixture of haematite and coke in a blast furnace. Haematite is an ore of iron containing iron oxide (Fe2O3). Coke is made from coal and is almost pure carbon.

(a) (i) The coke burns in air. This reaction heats the furnace to above 1300 °C.

Complete the chemical equation for carbon reacting with oxygen to form carbon dioxide.

........................ + O2 → CO2

(1)

(ii) Carbon monoxide is also formed in the furnace. Carbon monoxide reacts with iron oxide to produce iron and carbon dioxide.

iron oxide + carbon monoxide → iron + carbon dioxide

Complete and balance the chemical equation for the production of iron.

Fe2O3 + 3CO → ............................ + ............................ (2)

(iii) Iron from a blast furnace is called cast iron and contains about 4% carbon.



Page 11

Why is pure iron softer than cast iron?

...............................................................................................................

............................................................................................................... (1)

(b) Steel is made by reducing the percentage of carbon in cast iron and then adding different metals to form the type of steel required.

In the UK we use about 1.8 billion steel cans every year but only 30% of these are recycled. Recycling reduces waste. Producing steel from recycled cans requires only 25% of the energy needed to make steel from iron ore.

Give three environmental benefits of recycling a higher percentage of used steel cans.

1 .....................................................................................................................

........................................................................................................................

2 .....................................................................................................................

........................................................................................................................

3 .....................................................................................................................

........................................................................................................................ (3)

(Total 7 marks)



Page 12

Q5. Water sold in plastic bottles has a high ‘carbon cost’.

The ‘carbon cost’ depends on the amount of carbon dioxide emitted in making and transporting the product.

The more carbon dioxide emitted, the higher the ‘carbon cost’.

(a) Plastic water bottles are made from a polymer. The polymer is made from ethene. Ethene is made by cracking hydrocarbons.

(i) Name the polymer made from ethene.

........................................................................................................................... (1)

(ii) Ethene can be made by cracking the hydrocarbon pentane, C5H12.

C5H12 → C2H4 + C3H8

Explain why there is a ‘carbon cost’ for the process of cracking a hydrocarbon.

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................

........................................................................................................................... (2)

(b) The diagram shows information about water sold in plastic bottles in the UK. The diagram also shows the average distances that water and plastic bottles are transported.



Page 13

Suggest how the high ‘carbon cost’ of water sold in plastic bottles could be reduced.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (3)

(Total 6 marks)



Page 14

Q6. The demand for iron and steel is high.

(a) Iron that is extracted from its oxide by carbon reduction in a blast furnace is called cast iron. Cast iron contains about 4% carbon. This carbon makes cast iron very brittle.

Carbon steels can be made by the following processes.

• Blowing oxygen into molten cast iron to remove most of the carbon. • Adding a calculated amount of carbon.

Sometimes different metals may also be added to the molten carbon steels.

(i) Suggest how blowing oxygen into molten cast iron removes most of the carbon.

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................

........................................................................................................................... (2)

(ii) Why are different metals sometimes added to molten carbon steels?

...........................................................................................................................

........................................................................................................................... (1)



Page 15

(b) The percentage of iron and steel recycled in the UK has been increasing.

Year %iron and steel recycled

1998 25

2000 35

2002 42

2004 46

2006 57

The UK government has set targets for the percentage of iron and steel to be recycled. In 2006 the target was exceeded.

Suggest two reasons why the UK government wants to encourage recycling of iron and steel.

1 ..................................................................................................................................

.....................................................................................................................................

2 ..................................................................................................................................

..................................................................................................................................... (2)

(Total 5 marks)



Page 16

Q7. Aluminium has many uses because of its low density, good electrical conductivity, flexibility and resistance to corrosion.

The main steps in the extraction of aluminium are shown in the flow chart.

(a) Use the information in the flow chart to suggest the benefits of recycling aluminium.

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

.................................................................................................................................... (3)

(b) Pure aluminium is rarely used for the construction of large objects. Small amounts of other metals are usually mixed with aluminium.

Explain why.

....................................................................................................................................

....................................................................................................................................



Page 17

....................................................................................................................................

.................................................................................................................................... (2)

(Total 5 marks)



Page 18

Q8. Many everyday items are made from iron.

(a) Haematite is an ore of iron. Haematite contains iron oxide, Fe2O3.

(i) What is the meaning of the term ore?

...........................................................................................................................

........................................................................................................................... (1)

(ii) Iron can be produced by reacting iron oxide with carbon in a blast furnace.

What type of reaction produces the iron?

...........................................................................................................................

........................................................................................................................... (1)

(iii) The word equation for this reaction is:

iron oxide + carbon → iron + carbon dioxide

Complete and balance the symbol equation for this reaction.

.....Fe2O3 + .....C → ................... + ................... (2)

(b) Pure iron is relatively soft and not very strong.

The iron from the blast furnace is very hard and brittle. It contains about 4% carbon and is used as cast iron.



Page 19

Explain the differences in the properties of pure iron and cast iron by referring to the diagrams.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (3)

(c) The diagram shows the way in which iron is extracted, used and recycled.

Explain why the recycling of iron is necessary for sustainable development.



Page 20

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (3)

(Total 10 marks)



Page 1

Life cycle assessment + recycling Question Paper

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA



Difficulty level Gold Level



Score: /23

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1. Read the article and then answer the questions.

Supermarkets launch eco-friendly plastic milk bags. Could this be the end of the milk bottle?

Milk bottles are made from glass or from plastic.

Glass milk bottles contain 0.5 litres of milk. When the milk is used up the empty bottles are returned to be re-used. Glass milk bottles are re-used 24 times on average. The glass to make new milk bottles is produced when a mixture of sand, limestone, soda and recycled glass is heated to about 1600 °C in a furnace. There are almost unlimited amounts of the raw materials needed to produce this glass. About 35% of used glass is recycled.

The most common plastic milk bottles contain 2 litres of milk. When the milk is used up the empty bottles are discarded as waste. The plastic used to make these milk bottles is poly(ethene). Poly(ethene) is produced from crude oil by first using fractional distillation, then cracking the naphtha fraction and finally polymerising the ethene. About 5% of used poly(ethene) is recycled.

The new plastic milk bags contain 2 litres of milk. The milk bags are also made from poly(ethene). A milk bag uses 75% less poly(ethene) than is used to make the poly(ethene) milk bottles. When the milk is used up the empty bags are discarded as waste.

(a) Describe what happens in fractional distillation so that fractions, such as naphtha, are separated from crude oil.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................



Page 3

........................................................................................................................

........................................................................................................................ (3)

(b) Supermarkets claim that using milk bags instead of milk bottles would have less environmental impact.

Do you agree with this claim?

Use the information in the article and your knowledge and understanding to make appropriate comparisons to justify your answer.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (4)

(Total 7 marks)



Page 4

Q2. Supermarkets in the UK have been advised by the Government to stop giving plastic bags to customers. The Government states that this is because plastic bags use up resources that are not renewable and that the manufacture of plastic bags produces carbon dioxide. Most of these plastic bags are made from poly(ethene). The table shows methods to deal with large numbers of used plastic bags.

Method Description of what happens to the plastic bag

Reused used again by the customer

Recycled collected, transported, washed and melted to make new plastic items

Burned collected, transported and burnt to release heat energy

Dumped mixed with other household waste, collected, transported and disposed of at a landfill site

Use the information and your knowledge and understanding to briefly give one advantage and one disadvantage for each of these methods.

Reused ...................................................................................................................

.................................................................................................................................

.................................................................................................................................

Recycled .................................................................................................................

.................................................................................................................................

.................................................................................................................................

Burned ....................................................................................................................

.................................................................................................................................

.................................................................................................................................

Dumped ..................................................................................................................

.................................................................................................................................

................................................................................................................................. (4)

(Total 4 marks)



Page 5

Q3. Crude oil is the source of many useful materials. Crude oil is separated into fractions by fractional distillation.

(a) Describe how the naphtha fraction separates from the other fractions.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (2)

(b) The naphtha fraction is often used to make other useful materials.

This involves the cracking of hydrocarbons in the naphtha fraction.

For example:

decane → hexane + ethene

C10H22 → C6H14 + C2H4

(i) Balance the symbol equation given above. (1)

(ii) Describe how cracking is carried out.



Page 6

...........................................................................................................................

...........................................................................................................................

........................................................................................................................... (2)

(iii) Why does ethene have different chemical properties from decane and hexane?

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................

........................................................................................................................... (2)

(c) Ethene is used as the starting material for many polymers. The most common polymer is poly(ethene). One hydrocarbon molecule in poly(ethene) will contain thousands of carbon atoms.

Complete the diagram to show the bonds in ethene.

H H

C C

H H (1)

(d) Read the following information.

Landfill, Incineration, Recycling and Re-use of Poly(ethene)



Page 7

People could be encouraged to re-use their poly(ethene) bags and containers.

Recycling poly(ethene) saves raw materials and energy needed to make new plastic. When polymers are recycled the plastics must be collected, transported, sorted into different types by hand and washed. This requires the use of fossil fuels and is expensive.

Poly(ethene) can be burnt in an incinerator with other household waste. The heat released could be used to make steam to drive an electric generator. Surplus heat could be used to heat greenhouses used for growing vegetables. Incineration at too low a temperature can produce harmful substances. The residue (ash) has to go to landfill.

Landfill is probably the easiest way to dispose of polymers and it is cheap. Polymers are often mixed in with other household rubbish. Household waste does not get sorted into different materials because it is disposed of in the same hole in the ground. When the hole is eventually full, the waste is covered by a layer of soil to stop it smelling. The waste gets compressed under its own weight. Most polymers, such as poly(ethene), are not biodegradable so will remain in the ground forever.

You are asked to decide which option for the disposal of poly(ethene) will be put forward in your area. You decide that recycling is the best option.

Suggest one economic argument and one environmental argument that will be made against recycling.

For each argument made, how will you persuade those making the argument to accept your option?

(You must use only one sentence for each argument made against your decision and only one sentence for your response to it.)

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................



Page 8

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (4)

(Total 12 marks)



Page 1

Using materials Question Paper 1

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA


Sub Topic Using materials




Score: /58

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1.This question is about mixtures and analysis.

(a) Which two substances are mixtures?

Tick two boxes.

Air

Carbon dioxide

Graphite

Sodium Chloride

Steel

(2)

(b) Draw one line from each context to the correct meaning.

Context Meaning

A substance that has had nothing added to it

Pure substance in chemistry

A single element or a single compound

A substance containing only atoms which have different numbers of protons

Pure substance in everyday life

A substance that can be separated by filtration

A useful product made by mixing substances

(2)



Page 3

(c) What is the test for chlorine gas?

Tick one box.

A glowing splint relights

A lighted splint gives a pop

Damp litmus paper turns white

Limewater turns milky

(1)

(d) A student tested a metal chloride solution with sodium hydroxide solution.

A brown precipitate formed.

What was the metal ion in the metal chloride solution?

Tick one box.

Calcium

Copper(II)

Iron(II)

Iron(III)

(1) (Total 6 marks)



Page 4

Q2.Gold is mixed with other metals to make jewellery.

The figure below shows the composition of different carat values of gold.

(a) What is the percentage of gold in 12 carat gold?

Tick one box.

12 %

30 %

50 %

80 %

(1)

(b) Give the percentage of silver in 18 carat gold.

Use the figure above to answer this question.

Percentage = ......................................................... % (1)



Page 5

(c) Suggest two reasons why 9 carat gold is often used instead of pure gold to make jewellery.

1 .....................................................................................................................

........................................................................................................................

2 .....................................................................................................................

........................................................................................................................ (2)

(Total 4 marks)



Page 6

Q3.This question is about salts.

(a) Salt (sodium chloride) is added to many types of food.

Sodium chloride is produced by reacting sodium with chlorine.

sodium + chlorine sodium chloride

The diagram shows what happens to atoms of sodium and chlorine in this reaction.

The dots (•) and crosses (×) represent electrons.

Only the outer electrons are shown.

Describe, in terms of electrons, what happens when a sodium atom reacts with a chlorine atom to produce sodium chloride.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (3)

(b) Lack of iodine can affect the learning ability of children.

One idea is that salt (sodium chloride) should have iodine added.

(i) Iodine consists of simple molecules.

What is a property of substances that have simple molecules?

Tick ( ) one box.



Page 7

Have no overall electric charge

Have high boiling points

Have giant covalent structures

(1)

(ii) Which one of the following questions cannot be answered by science alone?

Tick ( ) one box.

How much sodium chloride is in food?

What harm does a lack of iodine do?

Should iodine be added to salt in food?

Give one reason why this question cannot be answered by science alone.

...............................................................................................................

............................................................................................................... (2)

(c) A student produced the salt ammonium nitrate by adding an acid to ammonia solution.

(i) Name the acid used.

............................................................................................................... (1)

(ii) Use the correct answer from the box to complete the sentence.



Page 8

an acid an alkali a salt

Ammonia solution (ammonium hydroxide) is ..................................... . (1)

(iii) The student added a few drops of a solution which changed colour when the reaction was complete.


The solution added is an ............................................................. . (1)

(d) Farmers buy solid ammonium nitrate in poly(ethene) sacks.

(i) How is solid ammonium nitrate made from a solution of ammonium nitrate?

Tick ( ) one box.

Crystallisation

Decomposition

Electrolysis

(1)

(ii) Why do farmers use ammonium nitrate on their fields?

...............................................................................................................

............................................................................................................... (1)



Page 9

(iii) The properties of poly(ethene) depend on the reaction conditions when it is made.

State one reaction condition that can be changed when making poly(ethene).

...............................................................................................................

............................................................................................................... (1)

(Total 12 marks)



Page 10

Q4.Dental braces are made from nitinol wires. Nitinol is a mixture of metals.

/iStock/Thinkstock © Zametalov/iStock/Thinkstock

(a) Nitinol can return to its original shape after being deformed.

Draw a ring around the correct answer to complete the sentence.

Nitinol is a shape memory

alloy.

catalyst.

polymer.

(1)

(b) Figure 1 shows the arrangement of atoms in a pure metal and in a mixture of metals.

Figure 1

Pure metal Mixture of metals

The mixture of metals is harder than the pure metal.

Use Figure 1 to explain why.

........................................................................................................................



Page 11

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(c) Gold and stainless steel are also used for dental braces.

Suggest two factors to consider when choosing which metal to use for dental braces.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(d) A thermosetting polymer is used to hold dental braces on the teeth.

Figure 2 shows the structure of a thermosetting polymer.

Figure 2

Thermosetting polymer

How can you tell from Figure 2 that the polymer is thermosetting?

........................................................................................................................

........................................................................................................................ (1)

(Total 6 marks)



Page 12

Q5.Printed pictures can be made using etchings.

© Eduardo Jose Bernardino/iStock

An etching can be made when a sheet of brass reacts with iron chloride solution.

(a) Brass is a mixture of two metals, copper and zinc.

(i) A mixture of two metals is called ............................................................ . (1)

(ii) Draw a ring around the correct answer to complete the sentence.

Copper and zinc atoms are different sizes.

harder

This makes brass more flexible than the pure metals.

softer

(1)

(b) Iron chloride has the formula FeCl3



Page 13

Relative atomic masses (Ar): Cl = 35.5; Fe = 56.

(i) Calculate the relative formula mass (Mr) of iron chloride (FeCl3).

...............................................................................................................

...............................................................................................................

...............................................................................................................

Relative formula mass (Mr) of iron chloride = ...................................... (2)

(ii) Calculate the percentage of iron in iron chloride (FeCl3).

...............................................................................................................

...............................................................................................................

...............................................................................................................

Percentage of iron in iron chloride = .................................................% (2)

(Total 6 marks)



Page 14

Q6. The picture shows a diamond ring.

Photograph supplied by Comstock/Thinkstock

(a) Diamond is a form of carbon. The diagram represents a carbon atom.

Complete the table to show the name and charge of each type of particle in the carbon atom.

Name of particle Charge

proton

neutron 0

-1

(2)

(b) Use the Chemistry Data Sheet to help you to answer these questions.



Page 15

(i) Draw a ring around the correct answer to complete the sentence.

compounds.

Gold and carbon are elements.

mixtures.

(1)

(ii) Complete the sentence.

Gold and carbon have different properties because gold is a metal

and carbon is a ...................

(1)

(c) Draw a ring around the correct answer to complete each sentence.

hard.

Pure gold is not used to make the ring because pure gold is too reactive.

soft.

a compound.

The gold ring is made by mixing pure gold with other metals to form an atom.

an alloy.

(2)



Page 16

(d) The data in the table shows some information about the three metals in the gold ring.

Name of metal Atomic number Percentage (%) of metal

gold 79

silver 47 16

copper 29 9

Draw one line from each question to its correct answer.

Question Answer

29

What is the percentage of gold in this ring?

61

How many electrons are there in a copper atom?

75

How many neutrons are in an atom of silver with a mass number of 108?

79

(3) (Total 9 marks)



Page 17

Q7. In the UK, railway sleepers are often made from concrete.

A scientist was asked to find the best concrete mixture to use so that railway sleepers would not break easily.

The scientist made:

• a mould to make small models of concrete sleepers

• concrete mixtures using crushed rock, sand, cement and water

• the equipment shown to add 0.1 kg masses until the model sleeper broke.

The scientist’s results are shown in the table.

Concrete mixture in % by volume

Total mass added to break the model sleeper in kg

Cement Sand Crushed

rock Test 1 Test 2 Test 3 Mean

10 70 20 1.1 1.3 1.2 1.2

20 60 20 2.6 2.5 2.4

30 50 20 3.3 3.3 3.3 3.3

40 40 20 3.8 4.0 3.3 3.9



Page 18

50 30 20 4.5 4.2 4.3 4.3

(a) (i) Calculate the mean total mass added to break the model sleeper that has 20% cement by volume.

...............................................................................................................

Mean = ........................... kg (1)

(ii) Choose one result in the table that the scientist should check and test again.

Result: % cement by volume ....................... Test number .......................

Explain why you chose this result.

...............................................................................................................

............................................................................................................... (2)

(iii) What is the relationship between the total mass to break the model sleeper and the percentage (%) of cement by volume in the concrete mixture?

...............................................................................................................

............................................................................................................... (1)

(iv) Suggest one other variable that the scientist should have recorded in the table of results.

............................................................................................................... (1)

(b) The scientist thought that full-size railway sleepers should be made from 30% cement, 50% sand and 20% crushed rock.

What other information about these three materials is needed before the scientist



Page 19

recommends using this mixture to make a full-size railway sleeper?

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(Total 7 marks)



Page 20

Q8. Gold and gold ions are used as catalysts.

(a) An atom of gold is represented as:

197 Au 79

Complete the sentences.

The atomic number of gold is ...................................................

The number of electrons in an atom of gold is ............................... (2)

(b) Scientists have found that gold nanoparticles are very good catalysts.


hundred

A gold nanoparticle contains a few thousand atoms.

million

(1)

(c) The formation of a gold ion (Au3+) from a gold atom (Au) is shown in the symbol equation.

Au → Au3+ + 3e–

(i) Complete the sentence.

The particles lost when a gold atom becomes a gold ion

are called ..................................................... (1)

(ii) Draw a ring around the correct answer to complete the sentence.



Page 21

one.

The number of these particles lost when a gold atom becomes a gold ion is two.

three.

(1)

(d) Gold ions are used as a catalyst in the reaction to make chloroethene.

How does a catalyst help a reaction?

........................................................................................................................ (1)

(e) Chloroethene can react to make a thermosoftening polymer.


dissolve.

When heated, a thermosoftening polymer will melt.

solidify.

(1)

(ii) Polymer B is a different type of polymer.

The diagram shows the structure of polymer B.



Page 22

How can you tell from the diagram that polymer B is not thermosoftening?

........................................................................................................................

........................................................................................................................ (1)

(Total 8 marks)



Page 1

Using materials Question Paper 1

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA






Score: /51

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1.Plastic and glass can be used to make milk bottles.

The figure below shows the percentage of milk bottles made from glass between 1975 and 2010.

(a) Plot the points and draw a line on the figure above to show the percentage of milk bottles made from materials other than glass between 1975 and 2010.

(3)

(b) The table below gives information about milk bottles.

Glass milk bottle Plastic milk bottle

Raw materials Sand, limestone, salt Crude oil

Bottle material Soda-lime glass HD poly(ethene)

Initial stage in production of bottle material

Limestone and salt used to produce

sodium carbonate.

Production of naphtha fraction.

Maximum temperature in production process

1600 °C 850 °C

Number of times bottle can be used for milk

25 1



Page 3

Size(s) of bottle 0.5 dm3 0.5 dm3, 1 dm3, 2 dm3, 3 dm3

Percentage (%) of recycled material used in new bottles

50 % 10 %

Evaluate the production and use of bottles made from soda-lime glass and those made from HD poly(ethene).

Use the information given and your knowledge and understanding to justify your choice of material for milk bottles.

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

.............................................................................................................................

............................................................................................................................. (6)

(Total 9 marks)



Page 4

Q2.This question is about metals and alloys.

(a) Explain how electricity is conducted in a metal.

To gain full marks you must include a description of the structure and bonding of a metal.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (4)

(b) Describe how the structure of an alloy is different from the structure of a pure metal.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(c) Alloys are used to make dental braces and coins.

(i) Nitinol is an alloy used in dental braces.

Why is Nitinol used in dental braces?

...............................................................................................................

............................................................................................................... (1)

(ii) Suggest one reason why coins are not made of pure copper.



Page 5

Do not give cost as a reason.

...............................................................................................................

............................................................................................................... (1)

(iii) Some coins are made from an alloy of aluminium.


Aluminium is manufactured by the electrolysis of a molten mixture of cryolite and

............................................................................................................... (1)

(iv) Banks keep coins in poly(ethene) bags. These bags are made from low density poly(ethene).

High density poly(ethene) can also be made from the same monomer.

How can the same reaction produce two different products?

...............................................................................................................

............................................................................................................... (1)

(d) Give two reasons why instrumental methods of analysis are used to detect impurities in metals.

........................................................................................................................

........................................................................................................................

........................................................................................................................ (1)

(Total 11 marks)



Page 6

Q3.The hip joint sometimes has to be replaced. Early replacement hip joints were made from stainless steel.

Stainless steel is an alloy of iron, chromium and nickel. The diagram below represents the particles in stainless steel.

Paticle diagram of stainless steal

(a) Use the diagram to complete the percentages of metals in this stainless steel.

The first one has been done for you.

Element Percentage (%)

Iron, Fe 72

Chromium, Cr

Nickel, Ni

(2)

(b) Pure iron is a soft, metallic element.



Page 7

(i) Why is iron described as an element?

...............................................................................................................

............................................................................................................... (1)

(ii) Pure iron would not be suitable for a replacement hip joint.

Suggest why.

...............................................................................................................

............................................................................................................... (1)

(iii) The three metals in stainless steel have different sized atoms. Stainless steel is harder than pure iron.

Explain why.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(Total 6 marks)



Page 8

Q4.Oil rigs are used to drill for crude oil.

© Digital Vision/Photodisc

(a) Drills are made from an alloy of iron.

The diagrams show the particles in the alloy and in pure iron.

Use the diagrams to explain why the alloy is harder than pure iron.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(b) Drill heads contain diamonds.

Tick ( ) two reasons why diamonds are hard.

Reason Tick ( )



Page 9

Diamonds have a giant covalent structure.

Diamonds have high melting points.

Diamonds are unreactive.

Diamonds have strong bonds between carbon atoms.

(2)

(c) Methane gas is often found where crude oil is found. The diagram shows how atoms bond in methane. Only the outer electrons are shown.


a compound.

Methane is an element.

a mixture.

(1)

(ii) Draw a ring around the correct answer to complete each sentence.

C4H4

The formula of methane is C4H

CH4



Page 10

(1)

(iii) Name the type of bond between the carbon and hydrogen atoms in methane.

............................................................................................................................... (1)

(d) Explain why methane is a gas at 20°C.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (2)

(Total 9 marks)



Page 11

Q5.The picture shows a diamond ring.

Photograph supplied by Comstock/Thinkstock

(a) Diamond is a form of carbon. A carbon atom has six electrons.

Draw the electronic structure of a carbon atom.

(1)

(b) A gold atom has an atomic number of 79 and a mass number of 197.

Complete the table to show the name and number of each sub-atomic particle in this gold atom.

Name Number

Proton 79

Electron ....................

......................... ....................

(3)

(c) The bar chart shows the composition of this gold ring.



Page 12

(i) Give the percentage of the other two metals in this gold ring.

Silver is ...................... % and copper is ...................... % (1)

(ii) This gold ring is not made from 100% gold.

Give two reasons why.

1 ............................................................................................................

...............................................................................................................

...............................................................................................................

2 ............................................................................................................



Page 13

...............................................................................................................

............................................................................................................... (2)

(Total 7 marks)



Page 14

Q6. In the UK, railway sleepers were made from wood. They are now often made from concrete.

A scientist was asked to find the best concrete mixture to use so that railway sleepers would not break easily.The scientist made:

• a mould to make small models of concrete sleepers

• concrete mixtures using crushed rock, sand, cement and water

• the equipment shown to add 0.1 kg masses until the model sleeper broke.

The scientist’s results are shown in the table.

Concrete mixture in % by volume

Total mass added to break the model sleeper in kg

Cement Sand Crushed

rock Test 1 Test 2 Test 3 Test 4 Mean

10 70 20 1.2 1.1 1.3 1.2 1.2

20 60 20 3.0 2.6 2.5 2.4

30 50 20 3.5 3.3 3.3 3.3 3.3

40 40 20 3.9 3.8 4.0 3.3 3.9

50 30 20 4.2 4.5 4.2 4.3 4.3



Page 15

(a) Calculate the mean total mass added to break the model sleeper that has 20 % cement by volume.

........................................................................................................................

........................................................................................................................

Mean = ........................... kg (2)

(b) State one conclusion that the scientist could make from these results.

........................................................................................................................

........................................................................................................................

........................................................................................................................ (1)

(c) The scientist sent the results in a report to a company that makes full-size concrete railway sleepers.

(i) Suggest two other factors that the company should take into consideration before deciding which mixture to use to make a full-size concrete railway sleeper.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(ii) The scientist’s report claimed that using concrete sleepers instead of wooden sleepers would have less environmental impact. Do you agree with the scientist’s claim? Use your knowledge and understanding to justify your answer. Remember to compare using concrete with using wood for the sleepers.

...............................................................................................................

...............................................................................................................



Page 16

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (4)

(Total 9 marks)



Page 1

Using materials Question Paper

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA






Score: /31

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1.This question is about metals.

Figure 1 shows the metals used to make pylons and the wires of overhead cables.

(a) An ore contains a metal compound.

A metal is extracted from its ore in three main stages, as shown in Figure 2.

Explain why Stage 2 needs to be done.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................



Page 3

(2)

(b) Cast iron from a blast furnace contains 96% iron and 4% carbon.

(i) Cast iron is not suitable for the manufacture of pylons.

Give one reason why.

...............................................................................................................

............................................................................................................... (1)

(ii) Most cast iron is converted into steel, as shown in Figure 3.

Describe how cast iron is converted into steel.

Use Figure 3 to help you to answer this question.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(c) Aluminium and copper are good conductors of electricity.

(i) State one property that makes aluminium more suitable than copper for overhead cables.

...............................................................................................................



Page 4

............................................................................................................... (1)

(ii) How can you tell that copper is a transition metal and aluminium is not a transition metal from the position of each metal in the periodic table?

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(iii) Copper can be extracted from solutions of copper salts by adding iron.

Explain why.

...............................................................................................................

...............................................................................................................

...............................................................................................................

............................................................................................................... (2)

(Total 10 marks)



Page 5

Q2.Oil rigs are used to drill for crude oil.

© Digital Vision/Photodisc

(a) Drill heads are made from steel. Steel is an alloy.

Explain why alloys are harder than pure metals.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (3)

(b) Drill heads also contain diamonds.

Describe, as fully as you can, the structure and bonding in diamond.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................



Page 6

........................................................................................................................

........................................................................................................................ (4)

(c) Polymers are produced from crude oil.

Describe the structure and bonding in a thermosoftening polymer and explain why thermosoftening polymers melt when heated.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (4)

(Total 11 marks)



Page 7

Q3. (a) PEX is a material that is used as an alternative to copper for hot water pipes. PEX is made from poly(ethene).

(i) Describe how ethene forms poly(ethene).

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................

........................................................................................................................... (2)

(ii) PEX is a shape memory polymer. What property does a shape memory polymer have?

...........................................................................................................................

........................................................................................................................... (1)

(iii) The simplified structures of poly(ethene) and PEX are shown.

Poly(ethene) PEX

Poly(ethene) is a thermoplastic that softens easily when heated.

Suggest and explain how the structure of PEX changes this property.

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................



Page 8

...........................................................................................................................

........................................................................................................................... (3)

(b) Copper was considered to be the most suitable material to use for hot water pipes. PEX is now used as an alternative material for hot water pipes.

Copper is extracted from its ore by a series of processes. 1 The low-grade ore is powdered and concentrated. 2 Smelting is carried out in an oxygen flash furnace. This furnace is heated to 1100 °C

using a hydrocarbon fuel. The copper ore is blown into the furnace with air, producing impure, molten copper.

3 Oxygen is blown into the impure, molten copper to remove any sulfur. The copper is cast into rectangular slabs.

4 The final purification of copper is done by electrolysis.

PEX is made from crude oil by a series of processes. 1 Fractional distillation 2 Cracking 3 Polymerisation 4 Conversion of poly(ethene) into PEX

Suggest the possible environmental advantages of using PEX instead of copper for hot water pipes.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (4)

(Total 10 marks)



Page 1

Haber process + use of NPK fertilisers

Question Paper

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA


Sub Topic Haber process + use of NPK fertilisers




Score: /52

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1.This question is about salts.

(a) Salt (sodium chloride) is added to many types of food.

Sodium chloride is produced by reacting sodium with chlorine.

sodium + chlorine sodium chloride

The diagram shows what happens to atoms of sodium and chlorine in this reaction.

The dots (•) and crosses (×) represent electrons.

Only the outer electrons are shown.

Describe, in terms of electrons, what happens when a sodium atom reacts with a chlorine atom to produce sodium chloride.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (3)

(b) Lack of iodine can affect the learning ability of children.

One idea is that salt (sodium chloride) should have iodine added.

(i) Iodine consists of simple molecules.

What is a property of substances that have simple molecules?

Tick ( ) one box.

Have no overall electric charge



Page 3

Have high boiling points

Have giant covalent structures

(1)

(ii) Which one of the following questions cannot be answered by science alone?

Tick ( ) one box.

How much sodium chloride is in food?

What harm does a lack of iodine do?

Should iodine be added to salt in food?

Give one reason why this question cannot be answered by science alone.

...............................................................................................................

............................................................................................................... (2)

(c) A student produced the salt ammonium nitrate by adding an acid to ammonia solution.

(i) Name the acid used.

............................................................................................................... (1)


an acid an alkali a salt



Page 4

Ammonia solution (ammonium hydroxide) is ..................................... . (1)

(iii) The student added a few drops of a solution which changed colour when the reaction was complete.


The solution added is an ............................................................. . (1)

(d) Farmers buy solid ammonium nitrate in poly(ethene) sacks.

(i) How is solid ammonium nitrate made from a solution of ammonium nitrate?

Tick ( ) one box.

Crystallisation

Decomposition

Electrolysis

(1)

(ii) Why do farmers use ammonium nitrate on their fields?

...............................................................................................................

............................................................................................................... (1)

(iii) The properties of poly(ethene) depend on the reaction conditions when it is made.

State one reaction condition that can be changed when making poly(ethene).

...............................................................................................................

............................................................................................................... (1)

(Total 12 marks)



Page 5

Q2.A flow diagram of the Haber process is shown below.

The Haber process produces ammonia from nitrogen and hydrogen.

(a) Use the correct answer from the box to complete the sentence.

air limestone natural gas

Hydrogen is obtained from ............................................................ . (1)

(b) In the reactor, nitrogen and hydrogen at a high pressure are heated and passed over a catalyst.

(i) Use the correct answer from the box to complete the sentence.

25 100 450

The temperature in the reactor is ........................................ °C (1)


copper iron nickel

The catalyst used in the reactor is ........................................ .



Page 6

(1)

(iii) How does a catalyst speed up a reaction?

Tick ( ) one box.

The catalyst lowers the activation energy.

The catalyst gives the reactants extra energy.

The catalyst increases the pressure in the reactor.

(1)

(c) A mixture of gases leaves the reactor.

The mixture contains ammonia, nitrogen and hydrogen.

Describe what happens to this mixture of gases in the condenser.

Use the flow diagram to help you.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (3)

(Total 7 marks)



Page 7

Q3. (a) Ammonia solution is used in cleaning products to remove grease from kitchen surfaces.

Ammonia solution is alkaline.

(i) Draw a ring around the number most likely to be the pH of ammonia solution.

1 3 7 10

(1)

(ii) Draw a ring around the ion in ammonia solution which makes it alkaline.

Cl– H+ Na+ OH–

(1)

(b) Ammonia is made using the Haber process.



Page 8

(i) Where does the nitrogen used in the Haber process come from?

Draw a ring around your answer.

air natural gas water

(1)

(ii) A high temperature of 450 °C is used in the reactor.

Tick ( ) two reasons in the table which explain why high temperatures make reactions faster.

Reasons Tick ( )

Particles move faster

Particles are closer together

Particles collide more often

Particles have less energy

(2)



Page 9

(iii) The iron in the reactor speeds up the reaction but is not used up.

What is the name given to substances that speed up the chemical reaction but which are not used up during the reaction?

...................................................................... (1)

(c) Complete the sentence.

The condenser separates the ammonia from the unreacted nitrogen and hydrogen by

turning the ammonia into a ....................................................................... (1)

(Total 7 marks)



Page 10

Q4. The flow diagram shows how ammonia is made.

(a) What effect, if any, does the pump have on the pressure of the nitrogen and hydrogen?


decreases

The pump has no effect on the pressure.

increases

(1)

(b) The word equation for making ammonia is:

nitrogen + hydrogen ammonia



Page 11

In the reactor only a small amount of the nitrogen and hydrogen is changed into ammonia.

Tick ( ) the reason why.

Reason why Tick ( )

Ammonia is formed from two elements.

Nitrogen and hydrogen are gases.

The reaction is reversible.

(1)

(c) In the cooler the mixture of gases is cooled.


a liquid.

The cooler turns the ammonia into a solid.

an element.

(1)

(d) What happens to the unreacted nitrogen and hydrogen from the reactor?

........................................................................................................................

........................................................................................................................ (1)

(Total 4 marks)



Page 12

Q5. Ammonium nitrate is an important chemical. The diagram shows the main stages in the manufacture of ammonium nitrate.

Study the diagram and then answer the questions.

Draw a ring around the correct answer in each box to complete the sentences.

(a) The compressor increases the

pressure

temperature

volume

to 200 atmospheres.

(1)

(b) In reactor 1 ammonia is made by reacting

air

natural gas

with

air.

hydrogen.



Page 13

nitrogen natural gas.

(2)

(c) In the condenser the mixture is

cooled

heated

reduced

and the ammonia is

separated as a liquid. (1)

(Total 4 marks)



Page 14

Q6. The Haber process is named after the German chemist, Fritz Haber. The diagram shows the main stages in the Haber process.

Reproduced with the permission of Nelson Thornes Ltd from PATRICK FULLICK et al, ISBN 0-7487-9644- 4. First published in 2006

(a) Use the diagram to help you to answer these questions.

(i) Complete the word equation for the reaction that takes place in the reactor.

nitrogen + .............................. ................................. (1)

(ii) What does the symbol mean?

........................................................................................................................... (1)

(iii) What is the purpose of the iron in the reactor?

........................................................................................................................... (1)

(iv) Ammonia is separated from unreacted nitrogen and hydrogen.

Draw a ring around the physical property that allows this separation to take place.



Page 15

boiling point density melting point (1)

(v) What is done with the unreacted nitrogen and hydrogen?

........................................................................................................................... (1)

(b) Some of the products that can be made from ammonia are:

• fertilisers • dyes • explosives • medicines • plastics

(i) The Haber process was invented a few years before the start of the First World War. It is thought that the First World War would have finished earlier if the Germans had not invented the Haber process.

Suggest why.

...........................................................................................................................

........................................................................................................................... (1)

(ii) The Haber process has helped to increase food production.

Explain why.

...........................................................................................................................

........................................................................................................................... (1)

(c) Factories that make ammonia are very large and operate night and day.

(i) Ammonia factories are often near towns.

Suggest why.



Page 16

........................................................................................................................... (1)

(ii) Suggest and explain one reason why local people might not want an ammonia factory near their town.

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................

........................................................................................................................... (2)

(Total 10 marks)



Page 17

Q7. Nitric acid can be neutralised by alkalis to make salts.

(i) The salt called potassium nitrate can be made from nitric acid.

Complete the word equation for this neutralisation reaction. Choose the correct substances from the box.

hydrogen oxygen potassium chloride

potassium hydroxide water

nitric acid + ................................ →potassium nitrate + ................................ (2)

(ii) Ammonium nitrate is another salt made from nitric acid.

Which one of the following is the main use of ammonium nitrate? Draw a ring around your answer.

dye fertiliser plastic fuel (1)

(iii) Complete this sentence by choosing the correct ion from the box.

H+ NH4+ NO3

– O2– OH–

The ion that makes solutions acidic is ............................................................ . (1)

(Total 4 marks)



Page 18

Q8. As the world population increases there is a greater demand for fertilisers.

(a) Explain what fertilisers are used for.

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

.................................................................................................................................... (2)

(b) The amount of nitrogen in a fertiliser is important.

(i) How many nitrogen atoms are there in the formula, NH4NO3?

......................................................................................................................... (1)



Page 19

(ii) Work out the relative formula mass of ammonium nitrate, NH4NO3.

Relative atomic masses: H 1; N 14; O 16.

...........................................................................................................................

...........................................................................................................................

Relative formula mass of ammonium nitrate = ............................... (1)

(Total 4 marks)



Page 1


Question Paper 1

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA






Score: /57

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1. (a) In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate.

The salt called potassium chloride is made when potassium hydroxide solution reacts with hydrochloric acid.

potassium hydroxide solution + hydrochloric acid potassium chloride solution + water

Describe a method for making crystals of potassium chloride from potassium hydroxide solution and hydrochloric acid.

In this method you should:

• describe how you will add the correct amount of the hydrochloric acid to neutralise the potassium hydroxide solution

• describe how you will get crystals of potassium chloride.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................



Page 3

........................................................................................................................

........................................................................................................................ (6)

(b) Ammonium nitrate is another salt. Ammonium nitrate is made when ammonia solution is neutralised with an acid.

Name the acid to complete the word equation.

ammonia + ........................................ acid ammonium nitrate (1)

(c) Read the information.

Ammonium nitrate – good or bad?

Some farmers put a lot of ammonium nitrate on their farmland.

Many people are worried about this use of ammonium nitrate.

Rain water can wash the ammonium nitrate off the farmland and into rivers and lakes. The ammonium nitrate may get into drinking water supplies and could be harmful to health.

(i) Why do some farmers put ammonium nitrate on their farmland?

........................................................................................................................

........................................................................................................................ (1)

(ii) Which one of the questions in the table cannot be answered by science alone?

Tick ( ) one question.

Question Tick ( )

How much ammonium nitrate is in drinking water?



Page 4

Should farmers stop using ammonium nitrate on their farmland?

Is ammonium nitrate soluble in rain water?

Give two reasons why this question cannot be answered by science alone.

........................................................................................................................

........................................................................................................................

........................................................................................................................

........................................................................................................................ (3)

(Total 11 marks)



Page 5

Q2. Ammonium nitrate is an important chemical. The diagram shows the main stages in the manufacture of ammonium nitrate.

Study the diagram and then answer the question.

(a) What is the purpose of the iron in reactor 1?

.....................................................................................................................................

..................................................................................................................................... (1)

(b) Explain why the best yield of ammonia at equilibrium is obtained:

(i) at low temperature

...........................................................................................................................

........................................................................................................................... (1)



Page 6

(ii) at high pressure.

...........................................................................................................................

........................................................................................................................... (1)

(c) The temperature used in reactor 1 is 450 °C.

Explain why a much lower temperature is not used.

.....................................................................................................................................

..................................................................................................................................... (1)

(d) A mixture of ammonia, nitrogen and hydrogen leaves reactor 1.

In the separator, what is done to the mixture to separate the ammonia from the other gases?

.....................................................................................................................................

..................................................................................................................................... (1)

(Total 5 marks)



Page 7

Q3. Neutralisation reactions can be used to make salts.

(a) Write an ionic equation for a neutralisation reaction, including state symbols.

..................................................................................................................................... (2)

(b) Ammonium nitrate is a salt used as a fertiliser.

(i) Ammonium nitrate is made by mixing two solutions. Name these solutions.

......................................................... and ......................................................... (1)

(ii) Hazard information about ammonium nitrate states:

• it is not itself a fire hazard (does not burn);

• it must not be allowed to come into contact with combustible materials such as fuels because it can cause these to catch fire.

Suggest why ammonium nitrate helps other substances to burn.

..........................................................................................................................



Page 8

.......................................................................................................................... (1)

(Total 4 marks)



Page 9

Q4. The flow diagram shows some stages in the manufacture of ammonium nitrate, NH4NO3.

(a) Which elements are obtained from the raw materials to make ammonia in the converter?

.....................................................................................................................................

..................................................................................................................................... (2)

(b) Suggest the purpose of the iron catalyst.

.....................................................................................................................................

..................................................................................................................................... (1)

(c) Farmers add ammonium nitrate to the soil. Explain why.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (2)

(Total 5 marks)



Page 10

Q5. Ammonia and nitric acid are both important chemicals. Nitric acid is made from ammonia.

The charts below show substances made from ammonia and nitric acid.

Substances made from Substances made from ammonia nitric acid

(a) Use the charts to help you answer these questions.

(i) What is the main use of both ammonia and nitric acid?

.......................................................................................................................... (1)

(ii) Work out the percentage of ammonia used to make nitric acid.

Percentage = ........................ % (1)

(iii) 100 million tonnes of ammonia are made in the world each year.

How much of this ammonia is used to make nylon?

.......................... million tonnes (1)



Page 11

(b) The word equations below show how nitric acid is made.

1. nitrogen + hydrogen → ammonia

2. ammonia + oxygen → nitrogen monoxide + water

3. nitrogen monoxide + oxygen → nitrogen dioxide

4. nitrogen dioxide + water → nitric acid

Use the word equations to help you answer these questions.

(i) From which two elements is ammonia made?

......................................................... and ......................................................... (1)

(ii) Name two of the raw materials needed to make nitric acid.

......................................................... and ......................................................... (2)

(c) A large amount of nitric acid is reacted with ammonia to make a fertiliser.

nitric acid + ammonia → fertiliser

(i) The reaction is a neutralisation reaction.

What type of chemical must ammonia be?

........................................................................................................................... (1)

(ii) Complete the chemical name for the fertiliser made from ammonia and nitric acid.

ammonium .................................................... (1)



Page 12

(iii) The reaction of nitric acid with ammonia is exothermic.

Name the piece of equipment you could put into the solution to prove that the reaction is exothermic.

........................................................................................................................... (1)

(Total 9 marks)



Page 13

Q6. The flow chart below shows the main stages in the production of ammonium nitrate.

(i) Name the two raw materials shown in the flow chart as A and B by choosing words from the list.

air coke limestone natural gas

Raw material A ........................................................

Raw material B ........................................................ (2)

(ii) Complete the word equation for the reaction which makes ammonia.



Page 14

....................................... + ....................................... → ammonia (1)

(iii) What is the purpose of the iron in the reactor?

.....................................................................................................................................

..................................................................................................................................... (1)

(iv) What is the purpose of pipe C?

.....................................................................................................................................

..................................................................................................................................... (1)

(Total 5 marks)



Page 15

Q7. Nitrates, such as ammonium nitrate, are added to soil to help plant growth.

(a) When rain falls nitrates dissolve and can end up in drinking water. Nitrates in drinking water can stop respiration in babies. This only happens if there is a lot of nitrate in the drinking water.

Plants use nitrates for growth. Humans need plants. Should large amounts of nitrates be added to soil? Give two reasons for your answer.

Answer ......................................................................................................................

Reason 1 ....................................................................................................................

....................................................................................................................................

Reason 2 ....................................................................................................................

.................................................................................................................................... (2)

(b) The amount of nitrogen in a nitrate compound is important.

(i) How many nitrogen atoms are there in the formula of ammonium nitrate, NH4NO3

.......................................................................................................................... (1)



Page 16

(ii) Calculate the percentage of nitrogen in ammonium nitrate, NH4NO3.

(Relative atomic masses: H = 1; N = 14; O = 16)

..........................................................................................................................

..........................................................................................................................

..........................................................................................................................

Percentage of nitrogen in ammonium nitrate = ........................................... % (3)

(Total 6 marks)



Page 17

Q8. The diagram shows the final stages in the manufacture of ammonia.

(a) Why is iron used in the converter?

....................................................................................................................................

.................................................................................................................................... (1)

(b) Write the word equation for the reaction in the converter.

....................................... + ....................................... .................................. (1)

(c) The yield of ammonia is only about 15%.

(i) Why can the yield not be 100%?

..........................................................................................................................

.......................................................................................................................... (1)



Page 18

(ii) Describe what happens to the mixture of gases after it leaves the converter.

..........................................................................................................................

..........................................................................................................................

.......................................................................................................................... (2)

(Total 5 marks)



Page 19

Q9. The flow diagram shows how to make ammonia and nitric acid from the nitrogen in the air.

(a) A fertiliser is made by neutralising ammonia with nitric acid. What is the name of this fertiliser?

..................................................................................................................................... (1)

(b) In the flow diagram, why are two different catalysts used?

.....................................................................................................................................

..................................................................................................................................... (1)

(c) What happens to catalysts at the end of a reaction?

.....................................................................................................................................

.....................................................................................................................................



Page 20

(1)

(d) Explain why catalysts are used in many industrial chemical reactions.

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (2)

(e) Explain, in terms of collisions between molecules, why a high pressure is used in the reaction between nitrogen and hydrogen.

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

..................................................................................................................................... (2)

(Total 7 marks)



Page 1


Question Paper

Level GCSE (9-1)

Subject Chemistry

Exam Board AQA






Score: /60

Percentage: /100

Grade Boundaries:

A* A B C D E U

>85% 777.5% 70% 62.5% 57.5% 45% <45%



Page 2

Q1. Humberstone was a town in the desert of Northern Chile in South America. It was built for the people who worked in the nearby sodium nitrate mines.

The sodium nitrate was used as a fertiliser.

The sodium nitrate was exported by ship to countries all around the world.

Today the mines have closed and nobody lives in Humberstone.

One of the reasons for the mines closing was the invention of the Haber process.

By Sznegra (Own work) [CC-BY-SA-3.0], via Wikimedia Commons

(a) The Haber process is used to make ammonia (NH3).

N2(g) + 3H2(g) 2NH3(g)

The forward reaction is exothermic.

(i) Name the raw materials that are used to supply the nitrogen and hydrogen.

Nitrogen ............................................................

Hydrogen .......................................................... (2)

(ii) The Haber process uses a temperature of 450 °C.

Explain, as fully as you can, why a temperature of 450 °C is used rather than a much



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higher temperature or a much lower temperature.

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(iii) Ammonia can be converted to ammonium nitrate by adding an acid.

Name this acid.

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(b) Suggest and explain why the invention of the Haber process caused the closure of the Humberstone mines in Chile.

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(Total 8 marks)



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Q2. Ammonia is made from nitrogen and hydrogen in the Haber process.

N2(g) + 3H2 (g) 2NH3 (g) (+ heat)

Flow Chart for the Haber Process

Effect of temperature and pressure on the amount of ammonia at equilibrium



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(a) Use the information given above and your knowledge of the Haber process and reversible reactions to help you to answer this question.

State which conditions of temperature and pressure would give the highest percentage of ammonia at equilibrium. Explain why.

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(b) The Haber process uses a temperature of 450 °C and a pressure of 200 atmospheres.

Explain why these conditions are chosen.

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(Total 7 marks)



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Q3. The Haber process is used to make ammonia (NH3) which is an important substance.

The equation below shows the reaction in which ammonia is formed.

N2(g) + 3H2(g) 2NH3(g) + Heat

The graph below shows how temperature and pressure affect how much ammonia is produced in the reaction.

In the industrial process a mixture of nitrogen and hydrogen is passed over iron at a temperature of about 450 °C and 200 atmospheres pressure.

(a) Use the graph to find the percentage of ammonia present when the temperature and pressure are 450 °C and 200 atmospheres.

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(b) Explain why the nitrogen and hydrogen mixture is passed over iron.

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(c) Explain, as fully as you can, using the graph and your knowledge of the Haber process why 450 °C and 200 atmospheres were chosen as conditions for this process.

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(Total 12 marks)



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Q4. (a) Ammonia is manufactured from nitrogen and hydrogen. The equation for the reaction between them is:

N2(g) + 3H2(g) 2NH3(g)

(i) What is the source of the nitrogen?

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(ii) Why does increasing the pressure increase the chance of molecules of hydrogen reacting with molecules of nitrogen?

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(iii) The percentage yield of ammonia is the percentage, by mass, of the nitrogen and hydrogen which has been converted to ammonia. Calculate the mass, in tonnes, of ammonia which can be produced from 90 tonnes of hydrogen when the percentage yield is 50%. The relative atomic masses are: H 1; N 14.

Show clearly how you get to your answer.

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Mass = ................................................ tonnes (2)

(b) The percentage yield of ammonia depends on the temperature and pressure inside the reaction vessel. The set of graphs show this.



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(i) MPa is the symbol for which unit?

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(ii) What is the percentage yield of ammonia produced at a temperature of 450 °C and a pressure of 20 MPa?

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(iii) Suggest what changes the chemical engineers should make to both the temperature and the pressure to increase the percentage yield of ammonia.

Temperature .....................................................................................................



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Pressure ............................................................................................................ (1)

(iv) How can the rate of ammonia production be increased without changing the temperature or pressure or the mass of hydrogen and nitrogen?

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(c) About four-fifths of ammonia production is used to produce fertilisers. One of them is known as NPK. It is made in the following way.

• Some ammonia is converted to nitric acid which is then mixed with phosphoric acid. • The mixture is neutralised with more ammonia and the solution is partly evaporated. • Potassium chloride is added to form granules. • The granules are coated to make the fertiliser free-flowing.



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Complete the flow-chart for the production of NPK by writing in the names of the correct chemicals in the six boxes.

(2)

(Total 10 marks)



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Q5. (a) Iron powder is used in the manufacture of ammonia. Why is it used?

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(b) Ammonia is manufactured from nitrogen and hydrogen. The equation for the reaction between them is:

N2(g) + 3H2(g) 2NH3(g)

(i) Which two raw materials are used to make the hydrogen?

.......................................................... and ........................................................ (1)

(ii) Why does increasing the pressure increase the chance of molecules of nitrogen reacting with molecules of hydrogen?

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(iii) Calculate the mass, in tonnes, of ammonia which could be produced from 560 tonnes of nitrogen.

The relative atomic masses are: H 1; N 14.

Show clearly how you get to your answer.

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Mass of ammonia = ............................................ tonnes (3)

(Total 6 marks)



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Q6. Ammonia is manufactured in the Haber Process, from nitrogen and hydrogen.

(a) Balance this symbol equation for the process.

(2)

(b) The graph below shows the percentage of reacting gases converted into ammonia, at different temperatures and pressures.

(i) What does the graph suggest about the temperature and pressure needed to convert the maximum percentage of reacting gases into ammonia?

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(ii) Suggest reasons why the manufacture of ammonia in the Haber Process is usually carried out at about 400°C and 200 atmospheres pressure.

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(Total 6 marks)



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Q7. Ammonia is manufactured from nitrogen and hydrogen. The reaction is shown in the equation below.

The diagram shows some details of the manufacturing process.

The graph shows the percentage of reacting gases converted into ammonia at different temperatures and pressures.



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At room temperature and pressure, the reaction is very slow and only a small percentage of the reacting gases is converted to ammonia.

Use the information on the diagram and graph to:

(a) describe the conditions used in the manufacture of ammonia to increase the rate of reaction.

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(b) describe and explain the conditions used in the manufacture of ammonia to increase the yield.

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(Total 11 marks)


1 using earth's resources, pot. water 2 2 14 8 114 9 haber ... · 1 using earth's...

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