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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Exothermic and endothermic reactions

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Exothermic and endothermic reactions

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Paper 4Theory (Extended)1 marks

Chemical reactions often require energy to proceed.

Description

Activation Energy in Reactions

Activation energy is the minimum energy required for colliding particles to initiate a reaction. It plays a crucial role in determining the rate of chemical reactions.

  1. a

    Define activation energy.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 4 structured question: Exothermic and endothermic reactions

Paper 4Theory (Extended)3 marks

Description

Temperature and Reaction Rates

Increasing the temperature of a reaction mixture generally increases the rate of reaction due to more particles having sufficient energy to overcome the activation energy barrier.

  1. a

    Explain how increasing temperature affects the rate of a reaction in relation to activation energy.

    Aim for approximately 3 distinct marking points.

    [3]