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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Redox

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Redox

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Paper 3Theory (Core)2 marks

Understanding redox reactions is essential in chemistry.

Description

Redox Reactions

In a redox reaction, one substance is oxidized while another is reduced. This involves the transfer of electrons and changes in oxidation states.

  1. a

    Explain What happens to the oxidation states of the substances involved in a redox reaction?

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Redox

Paper 3Theory (Core)3 marks

Description

Oxidation and Reduction

In a chemical reaction, substance A reacts with oxygen to form substance B. Substance C is formed when substance D loses oxygen.

  1. a

    Analyse Explain the processes of oxidation and reduction in the context of the reaction described.

    Aim for approximately 3 distinct marking points.

    [3]