Tuesday 9 September 2014



Th e diagram shows the electrolysis of alumina (aluminium oxide) purifi ed from bauxite.

1 a What is the formula for aluminium oxide?
   b What ions are present in aluminium oxide?
   c What is the purpose of the cryolite in the process?

2 Write down half-equations for the processes occurring during electrolysis at:
    a the anode:
    b the cathode:

3 Complete the two statements.
    a Oxidation ( of electrons) occurs at the .
    b Reduction ( of electrons) occurs at the .

4 Th e graphite anodes have to be replaced regularly. Why is this?

5 Why is it so much more cost-eff ective to recycle aluminium than to extract new aluminium?

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