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1 markAluminium

CAPE Chemistry Unit 2 · 2013 · Paper 2 · Question 6(c)(ii)a)

Aluminium metal is commercially extracted by the electrolysis of aluminium oxide dissolved in molten cryolite.

Outline one reason for the high economic/energy cost associated with the extraction of aluminium by electrolysis.

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Other parts of this question

  1. 6(a)Describe the Bayer process for extracting aluminium oxide from bauxite ore. Include two balanced chemical equations in your description.[7 marks]
  2. 6(b)(i)Name an environmental pollutant produced as a by-product during the extraction of alumina from bauxite.[1 mark]
  3. 6(b)(ii)Describe two environmental consequences caused by the named pollutant in (b)(i).[2 marks]
  4. 6(c)(i)Write balanced ionic half-equations for the reactions occurring at the cathode and the anode during the Hall-Héroult electrolytic process.[2 marks]
  5. 6(c)(ii)b)Suggest two reasons why the recycling of aluminium is important.[2 marks]

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