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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Rate of reaction

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Rate of reaction

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Paper 4Theory (Extended)3 marks

Catalysts play a significant role in chemical reactions.

Description

Role of Catalysts

Catalysts are substances that increase the rate of a reaction without being consumed. They provide an alternative pathway for the reaction with a lower activation energy.

  1. a

    Explain how catalysts affect reaction rates.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Rate of reaction

Paper 4Theory (Extended)1 marks

Description

Temperature and Reaction Rates

When the temperature of a reaction mixture is increased, the kinetic energy of the particles also increases. This leads to more frequent and more energetic collisions between reactant particles.

  1. a

    State the effect of increasing temperature on the rate of a chemical reaction.

    Aim for approximately 1 distinct marking point.

    [1]