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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 reaction between hydrochloric acid and magnesium ribbon is studied.

Description

Reaction of Hydrochloric Acid and Magnesium

When magnesium reacts with hydrochloric acid, hydrogen gas is produced. The rate of this reaction can be affected by various factors such as concentration and temperature.

  1. a

    Analyse Discuss how increasing the concentration of hydrochloric acid affects the rate of reaction with magnesium.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Rate of reaction

Paper 4Theory (Extended)4 marks

Description

Temperature and Reaction Rate

In a laboratory experiment, the effect of temperature on the reaction rate of sodium thiosulfate and hydrochloric acid is observed. As the temperature increases, the time taken for the reaction to complete is recorded.

  1. a

    Discuss Explain how temperature affects the rate of reaction based on collision theory.

    Aim for approximately 4 distinct marking points.

    [4]