Make uses of metals

Stainless steel is an alloy of iron and other metals. It is strong and does not rust but it costs much

more than normal steel.

What is not made from stainless steel?

• cutlery

• pipes in a chemical factory

• railway lines

• saucepans

Aluminium is obtained by the electrolysis of a mixture of aluminium oxide and cryolite.

Why is cryolite used?

• as a catalyst to speed up the process

• as a coolant to prevent the process getting too hot

• as a solvent for aluminium oxide

• as the main source of aluminium ions

Metal M is mixed with copper to produce brass.

What is M?

• chromium

• nickel

• vanadium

• zinc

Which row shows uses of the metals listed?

• A

• B

• C

• D

Molten iron from the blast furnace contains impurities.

The process of turning the impure iron into steel involves blowing oxygen into the molten iron and

adding calcium oxide.

What are the reasons for blowing in oxygen and adding calcium oxide?

• A

• B

• C

• D

Which row compares the strength of alloys with pure metals and explains the difference in strength?

• A

• B

• C

• D

Four substances present in the blast furnace during iron extraction are listed.

1 calcium carbonate

2 carbon dioxide

3 carbon monoxide

4 iron(III) oxide

Which substances are both a reactant and a product during the reactions occurring in the blast

furnace?

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

In a blast furnace, iron(Ill) oxide is converted to iron and carbon monoxide is converted to

carbon dioxide.

Fe₂O₃ + 3CO → 2Fe + 3CO₂

What happens to each of these reactants?

• Both iron(III) oxide and carbon monoxide are oxidised.

• Both iron(III) oxide and carbon monoxide are reduced.

• Iron(III) oxide is oxidised and carbon monoxide is reduced.

• Iron(Ill) oxide is reduced and carbon monoxide is oxidised.

During the electrolysis of aluminium oxide, the mass of the carbon anode changes.

Which row describes the change and gives a reason for this change?

• A

• B

• C

• D

Different types of steel alloys are manufactured by changing the percentage of carbon in the

alloy.

The properties of four steel alloys are shown.

• A

• B

• C

• D