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Cambridge IGCSE Combined Science practice

Paper 6 structured question: Diffusion

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Diffusion

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Paper 6Alternative to PracticalPractical3 marks

Analyzing results from a diffusion experiment.

Results Table

Diffusion Results

The table shows the time taken for different concentrations of a dye to diffuse through water.

Concentration (g/L)Time for Diffusion (s)
160
230
315
  1. a

    Explain the relationship between concentration and diffusion time based on the results.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 6 structured question: Diffusion

Paper 6Alternative to PracticalPractical1 marks

Method

Diffusion Experiment Method

In this experiment, cubes of agar gel containing phenolphthalein are placed in a dilute acid solution. The time taken for the color to change is measured.

Cube Size (cm³)Time for Color Change (s)
130
215
35
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]