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Cambridge IGCSE Chemistry 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 graph shows the change in concentration of a reactant over time during a chemical reaction.

Diagram Description

Concentration vs. Time Graph

The graph illustrates how the concentration of a reactant decreases over time, showing a curve that flattens as time progresses.

  1. a

    Explain the significance of the flattening curve in the graph.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Rate of reaction

Paper 3Theory (Core)1 marks

Data Table

Rate of Reaction Data

The table shows the time taken for the solution to turn cloudy at different concentrations of sodium thiosulfate.

Concentration (mol/dm³)Time (seconds)
0.160
0.230
0.320
0.415
  1. a

    State the trend observed in the data regarding concentration and time.

    Aim for approximately 1 distinct marking point.

    [1]