FORM 4 CHEM-METALS

1. Mild steel is an alloy of iron and carbon.

How does the carbon affect the properties of mild steel?

A The carbon makes the alloy a better conductor of electricity than iron.

B The carbon makes the alloy harder than the iron.

C The carbon makes the alloy softer than the iron.

D The carbon stops the iron rusting.

2. Which process takes place in the conversion of iron into steel?

A. Basic oxides are removed.

B. Carbon is converted to carbon dioxide.

C. Iron is oxidised.

D. Iron oxide is reduced.

3. Which reaction is not a step in the production of iron from hematite in the Blast Furnace?

A. carbon (coke) burning in air to produce carbon dioxide

B. carbon monoxide being formed from carbon and carbon dioxide

C. iron oxide reacting with carbon monoxide to form iron

D. iron reacting with limestone to produce slag

4. Aluminium is used to make saucepans because of its apparent lack of reactivity.

Which property of aluminium explains its unreactivity?

A. It has a high electrical conductivity.

B. It has a low density.

C. It has a surface layer of oxide.

D. It is in Group III of the Periodic Table.

5. Which metal is used for galvanising?

A. aluminium

B. copper

C. iron

D. zinc

6. Which reaction occurring in the blast furnace is an acid base reaction?

A. C + CO2 → 2CO

B. C + O2 → CO2

C. CaCO3 + SiO2 → CaSiO3 + CO2

D. Fe2O3 + 3CO → 2Fe + 3CO2

7. In the extraction of aluminium by the electrolysis of molten aluminium oxide, why is cryolite added to the aluminium oxide?

A. to ensure the aluminium is not oxidised

B. to ensure the anode is not oxidised

C. to lower the melting point of the aluminium oxide

D. to prevent corrosion of the cathode

8. Which reaction is not a step in the production of iron from hematite in the Blast Furnace?

A. carbon (coke) burning in air to produce carbon dioxide

B. carbon monoxide being formed from carbon and carbon dioxide

C. iron oxide reacting with carbon monoxide to form iron

D. iron reacting with limestone to produce slag

9. Which statement is correct about all metals?

A. They are attracted to a magnet.

B. They are weak and brittle.

C. They may be used to form alloys.

D. They react with water.

10. Stainless steel is used to make cutlery. Aluminium is used to make food containers.

Which property do both metals have that makes them suitable for these uses?

A. They are good conductors of electricity.

B. They are good conductors of heat.

C. They are resistant to corrosion.

D. They are very strong.

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