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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Exothermic and endothermic reactions

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3

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Exothermic and endothermic reactions

Exam-style question

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Paper 4Theory (Extended)3 marks

Analyzing energy changes in chemical reactions.

Diagram Description

Reaction Pathway Diagram

The diagram shows the energy levels of reactants and products, with a clear indication of activation energy and the energy change for the reaction.

  1. a

    Analyse the reaction pathway diagram provided, focusing on the energy changes involved in the reaction.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Exothermic and endothermic reactions

Paper 4Theory (Extended)4 marks

Description

Energy Changes in Reactions

Consider the following reactions: A + B → C (exothermic) and D + E → F (endothermic).

  1. a

    Compare the energy changes in the two reactions described above.

    Aim for approximately 4 distinct marking points.

    [4]