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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Rate of reaction

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Rate of reaction

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Paper 4Theory (Extended)3 marks

The rate of a chemical reaction can be influenced by several factors as described by collision theory.

Description

Factors Affecting Reaction Rates

Collision theory states that the rate of reaction depends on the frequency of collisions and the energy of the colliding particles. Factors such as temperature, concentration, and surface area can affect these parameters.

  1. a

    Discuss how increasing temperature affects the rate of a chemical reaction.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Rate of reaction

Paper 4Theory (Extended)3 marks

Description

Collision Theory Concepts

Collision theory explains how chemical reactions occur based on particle interactions. Key concepts include particle density, collision frequency, kinetic energy, and activation energy.

  1. a

    Explain the role of activation energy in chemical reactions.

    Aim for approximately 3 distinct marking points.

    [3]