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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Redox

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Redox

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Paper 4Theory (Extended)2 marks

Identify the changes in oxidation states in a redox reaction.

Description

Oxidation State Changes

In the reaction 2Mg + O2 → 2MgO, identify the oxidation states of magnesium and oxygen before and after the reaction.

  1. a

    Describe the changes in oxidation states of magnesium and oxygen.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Redox

Paper 4Theory (Extended)1 marks

Description

Redox Reaction Example

Consider the reaction between zinc and copper sulfate: Zn + CuSO4 → ZnSO4 + Cu.

  1. a

    State the substance that is oxidized in the reaction.

    Aim for approximately 1 distinct marking point.

    [1]