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The extraction of aluminium from its ore takes place in two stages, purification stage and electrolysis stage.
The diagram below shows the set up for the electrolysis stage.
(a) (i) Name the ore from which aluminium extracted.
(ii) Name one impurity which is removed at the purification stage.
(b) (i) Label on the diagram each of the following:
(I) Anode
(II) Cathode
(III) Region containing the electrolyte.
(ii) The melting point of aluminium oxide is #2054^0C#, but electrolysis is carried out between 800 – #900^0C#.
(I) Why is the electrolysis not carried out at #2054^0C#?
(II) What is done to lower the temperature?
(III) The aluminium which is produced is tapped off as a liquid. What does this suggest about its melting point?