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Cambridge IGCSE Combined Science practice

Paper 6 structured question: Rate of reaction

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Rate of reaction

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Paper 6Alternative to PracticalPractical1 marks

Analyzing results from a reaction rate experiment.

Results Table

Results of Reaction Rate Experiment

The table shows the time taken for the cross to disappear at different concentrations of hydrochloric acid.

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

    Describe the trend shown in the results table.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 6 structured question: Rate of reaction

Paper 6Alternative to PracticalPractical1 marks

Method

Method for Measuring Reaction Rate

In this experiment, you will mix hydrochloric acid with sodium thiosulfate and observe the time taken for a cross to disappear.

StepDescription
1Measure 50 ml of sodium thiosulfate solution.
2Add 10 ml of hydrochloric acid to the sodium thiosulfate.
3Start a timer as soon as the acid is added.
4Observe the cross under the solution and stop the timer when it is no longer visible.
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]