2012 first prelim chemistry paper 1 v2

Nan Hua High School 2012 First Preliminary Examinations Chemistry 5072/01

This paper consists of 15 printed pages.

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2012 FIRST PRELIMINARY EXAMINATIONS

Name: _________________________ ( ) Class:_________

Subject : Chemistry

Paper : 5072 / 01

Level : Secondary Four Express

Date : 04 July 2012

Duration : 1 hour

INSTRUCTIONS TO CANDIDATES 1. Write your name, index number and class on the OTAS answer sheet.

2. There are forty questions on this paper. Answer all questions. For each question there are

four possible answers A, B, C and D.

Choose the one you consider correct and record your choice in soft pencil on the OTAS

answer sheet provided.

INFORMATION FOR CANDIDATES

Each correct answer will score one mark. A mark will not be deducted for a wrong answer.

Any rough working should be done in this booklet.

A copy of the Periodic Table is printed on page 15.

NAN HUA HIGH SCHOOL


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1. The apparatus below consists of a beaker of gas B was inverted over a

porous pot containing gas A.

Which of the following pair of gases would cause the water level at X to fall?

gas A gas B A ethene nitrogen B methane carbon dioxide C oxygen ammonia

D chlorine nitrogen 2. Chromatogram 1 below shows the separation of coloured inks in mixture Q using

solvent A. Chromatogram 2 shows the separation using the same piece of paper but after it has been rotated anti-clockwise 90o in another solvent B.

A

How many different types of inks are present in the mixture Q? 3

B 4 C 5

D 6

Q

Q

Chromatogram 1 Chromatogram 2


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3. A liquid is thought to be pure ethanoic acid. Which of the following can be used to test for the purity of the acid?

A react it with ethanol B use universal indicator C measure its boiling point

D burn it completely with oxygen

4. The diagram shows the apparatus used to separate hexane (boiling point 70oC) and water. Which graph would be obtained if the temperature at point T was plotted against the total volume of distillate collected?

70

80

90

100

Tem

pe

ratu

re/°

C

Total volume of distillate

70

80

90

100

Tem

pe

ratu

re/°

C


C

70

80

90

100

Tem

pe

ratu

re/°

C


D

70

80

90

100

Tem

pe

ratu

re/°

C


A B


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5. Which diagram best represents a mixture of hydrogen and nitrogen in air?

- hydrogen atom - nitrogen atom

A B C D

6. The atomic numbers and mass numbers of elements W and Q are given below:

element atomic number mass number

W 13 25

Q 8 17

The molecular mass of the compound formed by the combination of W and Q is A 42 B 76 C 96

D 101

7. Which one of these ionic compounds experiences the strongest ionic bond between it ions?

A NaF B MgO C KCl

D LiBr

8. In which of the following is there at least one double bond?

1 O2 2 CO2 3 C2H4

A 1 only B 3 only C 2 and 3 only

D all of the above


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9. The diagrams below show the structures of two substances, P and Q.

Which of the following statements is true?

A They are both formed by the sharing of electrons. B They both have similar melting and boiling points. C P is a good conductor of electricity but Q is a non-conductor of electricity.

D They are both formed by the transferring of electrons from one atom to another.

10. The equation for the burning of hydrogen in oxygen is

2H2 (g) + O2 (g) 2H2O (g)

This equation indicates that

A 2 g of hydrogen combines with 1 g of oxygen. B 2 atoms of hydrogen combine with 2 atoms of oxygen. C 2 moles of steam can be obtained from 1 mole of oxygen.

D 1 molecule of steam can be obtained from 1 molecule of oxygen.

11. What is the maximum mass of chromium that can be extracted from 76 g of chromium (III) oxide?

A 26 g B 32 g C D

52 g 64 g

12. If the number of particles in one mole is x, what is the number of chlorine molecules in 35.5 g of gaseous chlorine?

A 0.25 x B 0.5 x

C x

D 2 x


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13. The equation below shows an exothermic reaction.

Mg (s) + 2HCl (aq) MgCl2 (aq) + H2 (g)

Which statement about this exothermic reaction is incorrect?

A Magnesium chloride is soluble in water.

Magnesium is above hydrogen in the reactivity series. One mole of magnesium produces one mole of hydrogen gas. The total energy of the products is greater than that of the reactants.

B C

D

14. The scheme shows four stages I to IV in the conversion of solid candlewax C30H62 into carbon dioxide and water.

C30H62 (s) C30H62 (l) C30H62 (g)

Which stages are endothermic?

A I and II B II and III C III and IV

D I and IV 15. In an experiment, 10 cm3 portions of 1.0 mol/dm3 hydrochloric acid are added to

separate solutions of sodium thiosulfate in flasks placed over paper marked with a cross. With the flask viewed vertically, the time taken for the cross to be obscured is measured. Which of the following reacting mixtures requires the shortest time for the cross to be obscured?

Volume of water / cm3

Volume of thiosulfate solution / cm3

Concentration of thiosulfate solution / mol/dm3

A 25 25 0.50

B 20 30 0.25

C 10 40 0.25

D 0 50 0.20

30 CO2 (g) +

31 H2O (g)

30 CO2 (g) +

31 H2O (l)

I II III IV


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16. In the graph, curve X represents the result of the reaction between 1.0 g of granulated zinc and an excess of acid at 30oC.

Which change could produce curve Y?

A 1.0 g of powdered zinc at 20oC B 1.0 g of granulated zinc at 20oC

C 0.5 g of granulated zinc at 20oC

D 0.5 g of granulated zinc at 40oC

17. The diagram shows the colours of two indicators, methyl orange and methyl red, at

different pH values.

pH 2 3 4 5 6

colour of methyl orange

red yellow

colour of methyl red

red yellow

The table shows the pH of four solutions.

solution W X Y Z

pH 2 3 5 6

In which solutions will both indicators be red?

A W only B W and X C X and Y

D Y and Z


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18. A solution containing a high concentration of H+ (aq) ions

I has a pH of less than 7 II liberates hydrogen when added to any metal III conducts electricity

Which one of the above is true of the solution?

A B C D

II only I and II only I and III only all of the above

19. The diagram below shows a reaction scheme.

Which of the following are the identities of X, Y and Z?

X Y Z

A aluminium sulfate ammonia gas silver sulfate

B calcium iodide carbon dioxide gas silver iodide

C ammonium chloride ammonia gas silver chloride

D lead (II) carbonate carbon dioxide gas silver carbonate

20. Which pair of substances will give the highest yield of copper (II) sulfate?

A copper and dilute sulfuric acid B copper(II) carbonate and dilute sulfuric acid C copper(II) oxide and aqueous ammonium sulfate

D aqueous copper(II) nitrate and aqueous sodium sulfate

White solid, X

Colourless solution Gas Y

White precipitate, Z

Red litmus turns blue

Add water

Warm with aqueous sodium hydroxide

Add acidified silver nitrate solution

Test with moist red litmus paper


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21. In the Haber process for the manufacture of ammonia,

I the hydrogen needed can be obtained from the cracking of petroleum

II the nitrogen needed is obtained from fractional distillation

III the unchanged reactants are recirculated Which of the above is/are correct?

A all of the above B I and III C II only

D none of the above 22. From which ammonium salt can the greatest mass of ammonia be obtained

upon heating?

A 1.0 mol NH4Cl B 1.0 mol NH4NO3 C 0.5 mol (NH4)3PO4

D 0.5 mol (NH4)2SO4

23. A catalytic converter in a car exhaust system changes pollutants into less harmful

products. Which change does not occur in a catalytic converter?

A carbon dioxide carbon B nitrogen oxides nitrogen C carbon monoxide carbon dioxide

D unburned hydrocarbons carbon dioxide and water 24. To reduce atmospheric pollution, the waste gases from a coal-burning power

station are passed through powdered calcium carbonate. Which waste gas will not be removed by the powdered calcium carbonate?

A sulfur dioxide, SO2 B nitrogen dioxide, NO2 C carbon monoxide, CO

D phosphorus(V) oxide, P2O5 25. Which series of changes includes both oxidation and reduction?

A C CO CO2 B N2 NH3 NO C PbO2 PbO Pb

D C2H2 C2H4 C2H6


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26. An acidic gaseous reducing agent is passed through an aqueous solution of X. The solution changes from orange to green. What could X be?

A methyl orange B iron (II) sulfate C potassium iodide

D acidified potassium dichromate (VI)

27. Caesium is a metal that is more reactive than aluminium. Which reaction

would produce caesium?

A heating caesium carbonate B heating caesium oxide with carbon C electrolysing molten caesium chloride

D electrolysing aqueous caesium chloride 28. The carbonate of metal X is a white solid. It decomposes when heated to form

carbon dioxide and a yellow solid oxide. What is metal X?

A iron B lead C copper

D sodium 29. What is the reducing agent in the blast furnace for extracting iron from its ore?

A silica B carbon dioxide C carbon monoxide

D calcium carbonate


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30. The diagram below shows the electroplating of object X.

Which of the following would NOT take place in this electroplating?

A The mass of the slab of copper decreases. B Reddish-brown solid is deposited on object X. C The half equation at the anode is Cu → Cu2+ + 2e- .

D The colour of blue copper (II) chloride solution fades gradually. 31. Two strips of metals P and Q of different reactivity are connected by an

electric wire. The mass of metal Q increases when both of them are immersed in silver nitrate solution. Which of the following statements is NOT correct?

A The ions of metal P are detected in the solution after a while.

Electrons flow from the strip of metal Q to metal P.

Silver solids are deposited on the strip of metal Q.

Reduction reaction takes place at metal Q.

B

C D 32. What are the products of electrolyzing molten magnesium chloride?

Anode Cathode

A chlorine hydrogen

B chlorine magnesium

C oxygen hydrogen D oxygen magnesium 33. Element X reacts with water producing an acidic solution. This solution gives a

white precipitate with aqueous silver nitrate. In which group of the Periodic Table is X?

A I B II C IV D VII


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34. Element Q has a melting point greater than 1000°C. It has oxidation states of +2 and +3 in its compounds. It forms two chlorides: one green and the other yellow.

In which labeled position of the outline Periodic Table shown below is Q likely to be found?

35. In the process of manufacturing ethanol by fermentation, which of the following

is not carried out?

A Use of carbohydrate as a starting material. B Addition of yeast to provide enzymes to catalyse the reaction. C Fractional distillation to obtain pure ethanol from the mixture. D Provision of oxygen for the fermentation mixture to respire. 36. What is/are the product(s) of the reaction between ethene and hydrogen

bromide?

A CH3CH2Br

B CH3CH2Br and H2

C CH2BrCH2Br

D CH2BrCH2Br and H2

37. Petroleum is a very important raw material that is separated into more useful

products. Which terms describe petroleum and the method used to separate it?

petroleum is a method used to separate petroleum

A compound cracking

B compound fractional distillation

C mixture cracking

D mixture fractional distillation


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38. Aspirin is a drug which is used as a pain killer. It has the structure as shown below.

Which of the following is true about aspirin?

A It is a polyester. B It is an unsaturated hydrocarbon. C It turns acidified potassium dichromate (VI) green.

D Its aqueous solution reacts with potassium carbonate. 39. Acrylic fibre is an addition polymer. Part of this polymer chain is shown:

H H CN H H H CN H

| | | | | | | | – C – C – C – C – C – C – C – C – | | | | | | | | CN H H H CN H H H Which of the following monomer would form this polymer?

A H H

| | C = C | |

H CN

C H CN | | C = C | |

CN H B H CN H

| | | C = C – C = C

| | | H CN H

D H H H | | |

C = C – C = C | | | H CN H


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40. The diagram below shows part of a polymer. Which of the following statements is not true about the polymer?

A It contains ester linkages. B It is made up of one type of monomer. C It is made up of unsaturated monomers.

D It is made from condensation polymerization.


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2012 first prelim chemistry paper 1 v2

Documents

b nan hua high school

q q chromatogram

ethanol b

beaker of gas b

mixture q

chemistry paper

naf b mgo c kcl d libr

boiling point d burn