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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Electrolysis

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Electrolysis

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Paper 4Theory (Extended)3 marks

Electrolysis of molten sodium sulfate

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Electrolysis of Sodium Sulfate

During the electrolysis of molten sodium sulfate (Na2SO4), sodium ions and sulfate ions are present.

  1. a

    Analyse Describe the products formed at each electrode during the electrolysis of molten sodium sulfate.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Electrolysis

Paper 4Theory (Extended)2 marks

Description

Electrolysis of Calcium Fluoride

During the electrolysis of molten calcium fluoride (CaF2), calcium ions and fluoride ions are present.

  1. a

    Analyse Identify the products formed at each electrode during the electrolysis of molten calcium fluoride.

    Aim for approximately 2 distinct marking points.

    [2]