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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Extraction of metals

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Extraction of metals

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Paper 4Theory (Extended)3 marks

Electrolysis Process

Description

Electrolysis of Aluminium Oxide

During the electrolysis of aluminium oxide, aluminium ions are reduced at the cathode and oxide ions are oxidized at the anode. Carbon anodes are consumed in the process.

  1. a

    Explain the necessity for regular replacement of carbon anodes in the extraction of aluminium.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Extraction of metals

Paper 4Theory (Extended)1 marks

Description

Electrolysis of Aluminium Oxide

The extraction of aluminium from bauxite involves the electrolysis of aluminium oxide dissolved in molten cryolite. Carbon anodes are used, and the process requires regular replacement of these anodes due to their consumption during the reaction.

  1. a

    State the role of cryolite in the extraction of aluminium.

    Aim for approximately 1 distinct marking point.

    [1]