Explain its significance in the extraction of aluminium:

Cryolite.

Explain its significance in the extraction of aluminium:

Graphite.

Distinguish between electrolytic methods of reduction and refining.

Give three ways in which the metal zinc differs from the non-metal carbon. At least one of the differences must be a chemical difference.

Explain the following:

Zinc is used to cover iron so as to prevent rusting of iron. Why?

Explain the following:

In construction work, why is the alloy of aluminium-duralumin used rather than pure aluminium?