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Cambridge IGCSE Chemistry practice

Paper 6 structured question: Experimental design

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Experimental design

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Paper 6Alternative to PracticalPractical2 marks

Analyzing the results of a titration experiment.

Results Table

Titration Results

The following table shows the volume of titrant used to reach the endpoint in several trials.

TrialVolume of Titrant (mL)
125.0
224.5
325.5
425.0
  1. a

    Calculate the average volume of titrant used in the trials.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Experimental design

Paper 6Alternative to PracticalPractical1 marks

Method

Method for Investigating Reaction Rate

In this experiment, you will mix sodium thiosulfate with hydrochloric acid and measure the time taken for a precipitate to form at different temperatures.

Temperature (°C)Time taken (s)
2030
3020
4015
5010
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]