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Cambridge IGCSE Chemistry 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

Understanding the concept of activation energy is essential in chemistry.

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Activation Energy

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

  1. a

    State the definition of 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

Activation Energy and Reaction Rates

Activation energy affects how quickly reactions occur. A higher activation energy means that fewer particles will have enough energy to react, leading to slower reaction rates.

  1. a

    Define activation energy and explain its significance in chemical reactions.

    Aim for approximately 3 distinct marking points.

    [3]