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

Chemical reactions involving oxidation and reduction are common in various processes.

Description

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

a
Analyse Explain the processes of oxidation and reduction in the context of the reaction described.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 3Theory (Core)2 marks

Description

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

a
Explain What happens to the oxidation states of the substances involved in a redox reaction?
Your answer
Aim for approximately 2 distinct marking points.
[2]