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Cambridge IGCSE Chemistry practice

Paper 6 structured question: Experimental design

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Experimental design

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Measuring Temperature in a Reaction

Method

Method for Measuring Temperature Change

In a reaction between hydrochloric acid and sodium hydroxide, the temperature change is measured using a thermometer. The initial temperature of the acid is recorded before the sodium hydroxide is added. After mixing, the maximum temperature is recorded.

  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 6 structured question: Experimental design

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Results Table

Temperature Change Results

The table below shows the temperature changes observed during the reaction.

Amount of NaOH (g)Initial Temperature (°C)Final Temperature (°C)Temperature Change (°C)
020200
120255
2203010
3203515
  1. a

    Identify the dependent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]