Cambridge IGCSE Combined Science practice

Paper 3 structured question: Redox

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Paper

Marks

Topic

Redox

Exam-style question

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Paper 3Theory (Core)3 marks

Redox reactions are important in various chemical processes.

Description

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

a
Explain the significance of redox reactions in biological systems.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 3Theory (Core)2 marks

Description

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

a
Identify the processes of oxidation and reduction in the reaction.
Your answer
Aim for approximately 2 distinct marking points.
[2]