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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Rate of reaction

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Rate of reaction

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Paper 3Theory (Core)3 marks

A reaction between magnesium and hydrochloric acid is monitored over time. The concentration of hydrogen gas produced is measured at regular intervals.

Data Table

Data Table of Hydrogen Gas Production

The table lists time intervals and corresponding concentrations of hydrogen gas produced.

Time (s)Concentration of H2 (mol/L)
00
100.5
201.0
301.5
401.5
501.5
  1. a

    Evaluate the data and discuss the rate of reaction over time.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Rate of reaction

Paper 3Theory (Core)3 marks

Description

Graph of Reaction Rate vs. Temperature

The graph shows the rate of reaction (in arbitrary units) on the y-axis and temperature (in degrees Celsius) on the x-axis. As the temperature increases, the rate of reaction also increases until it levels off at higher temperatures.

  1. a

    Analyse the graph and describe the relationship between temperature and reaction rate.

    Aim for approximately 3 distinct marking points.

    [3]