Cambridge IGCSE Chemistry practice

Paper 3 structured question: Exothermic and endothermic reactions

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Paper

Marks

Topic

Exothermic and endothermic reactions

Exam-style question

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Paper 3Theory (Core)3 marks

Consider the energy changes in the following reaction pathway.

Diagram Description

The diagram illustrates a reaction with a significant activation energy and shows the energy levels of reactants and products.

a
Explain the significance of activation energy in this reaction.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 3Theory (Core)1 marks

Diagram Description

The diagram shows the energy changes for a chemical reaction, indicating the energy of reactants, products, and the activation energy.

a
State the type of reaction represented in the diagram.
Your answer
Aim for approximately 1 distinct marking point.
[1]