Name the main gases in

air, give the formula of

each one and state their

relative proportions.

Use ideas about bonding and forces between molecules to explain the properties of oxygen.

The atoms in molecules

are together by covalent

bonds. Describe covalent

bonding.

Why do pure molecular substances not conduct electricity?

Explain why

simple molecular

substances have

low melting and

boiling points.

5 a day revisionC5 – Molecules in the air

Boiling point State at room temperature

Density Electrical conductivity

-218C gas very low does not conduct

@aegilopoides

Describe ionic bonding.

State two properties of ionic

compounds.

Zinc ions can be detected by adding carbonate ions

(CO32-) to form the

insoluble compound zinc carbonate (ZnCO3). Work

out the charge on the zinc ion and write a balanced ionic equation, including

state symbols.

Potassium chloride is an example of a salt found in the sea. Complete the table of results and give

reasons for your answers.

5 a day revisionC5 – Ionic compounds

Some tests are carried out on a water sample. Use the information in the table to identify the three ions that are present. Test 1. A white precipitate formed when sodium hydroxide was added. It dissolved when excess sodium hydroxide was added. Test 2. Bubbles of gas were given off when nitric acid was added to the sample.When silver nitrate was added a cream precipitate formed. @aegilopoides

What is the name

given to rocks

that contain

metal minerals.

Diamond and graphite are both minerals formed from pure carbon. Explain why

graphite can conduct electricity but diamond can’t. You can use a diagram to

help explain your answer.

Carbon dioxide has a simple molecular structure,

diamond has a giant covalent structure. Describe the main differences between the two

types of structure.

Describe and explain 2

properties of diamond.

Some metals can be extracted from their ores

by heating their metal oxides with carbon. This is

called a redox reaction. Describe the two processes

that take place using zinc oxide as an example.

5 a day revisionC5 – Giant molecules and metals

@aegilopoides

What is the

difference between

relative atomic mass

and relative formula

mass?

An electric current is passed through molten potassium

chloride. Write ionic equations to help explain what happens at each electrode and name

the products that are formed.

5 a day revisionC5 – Equations, masses and electrolysis

The diagram shows electricity being passed through molten lead bromide.

What will form at each electrode?

Iron oxide can be heated with charcoal to extract the iron. In one reaction the iron oxide, Fe2O3, reacts with carbon to produce iron and carbon dioxide. Write a balanced symbol equation for this reaction.

Lead metal can be extracted

from lead oxide (PbO) by

heating it with carbon.

2PbO + C 2Pb + CO2

What is the maximum mass of

lead that can be extracted

from 446g of lead oxide?

@aegilopoides

Describe

metallic

bonding.

Copper is used to make electrical wiring for homes. Give one reason why copper is a good choice for making electrical wiring

and two disadvantages of using copper for this purpose.

Aluminium is a metal but

aluminium oxide is an ionic

compound. Aluminium metal and

aluminium oxide conduct electricity

in different ways. Describe and

explain the difference. .

Copper extraction causes environmental problems due to large amounts of

waste rock. Explain why so much waste rock is

produced.

5 a day revisionC5 – Metals and the environment

A mining company can recover 40g of copper ore

from every kilogram cuprite (Cu2O ) that is mined. of mined rock. What is the

maximum amount of copper metal the company will be

able to recover from a kilogram of mined rock?

@aegilopoides