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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Rate of reaction

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3

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Rate of reaction

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Paper 4Theory (Extended)3 marks

Collision theory is fundamental in understanding chemical reactions.

Description

Collision Theory Overview

Collision theory states that for a reaction to occur, particles must collide with sufficient energy and proper orientation. Factors such as particle density, kinetic energy, and activation energy play significant roles in determining the rate of reactions.

  1. a

    Explain how particle density affects the rate of reaction.

    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

Factors Affecting Reaction Rates

Collision theory explains that the rate of a reaction depends on the frequency of collisions and the energy of the colliding particles. Factors such as temperature, concentration, and surface area can influence these aspects.

  1. a

    State one factor that affects the rate of reaction according to collision theory.

    Aim for approximately 1 distinct marking point.

    [1]