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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

Consider the following reaction: A + O2 → B + C.

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Redox Reaction Example

In this reaction, substance A reacts with oxygen to form products B and C. Identify the processes occurring in this reaction.

  1. a

    Identify the processes of oxidation and reduction in the reaction.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Redox

Paper 3Theory (Core)3 marks

Description

Redox Reactions

In a redox reaction, one substance loses oxygen while another gains it. This transfer is crucial in processes like combustion and respiration.

  1. a

    Explain the significance of redox reactions in biological systems.

    Aim for approximately 3 distinct marking points.

    [3]