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Examine the factors that affect diffusion, specifically: surface area, temperature, concentration gradient, and distance.

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Cambridge IGCSE BiologyMovement into and out of cellsCore contentPractical objective

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Examine the factors that affect diffusion, specifically: surface area, temperature, concentration gradient, and distance

  • This point belongs to Diffusion, especially Diffusion outcomes.
  • You need to be able to examine the factors that affect diffusion, specifically: surface area, temperature, concentration gradient, and distance.
  • The key ideas to know are Investigate.
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Key concepts

Investigate

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Paper 6 structured question: Diffusion

Paper 6Alternative to PracticalPractical3 marks

Method

Method to Investigate Temperature Effect on Diffusion

1. Fill three beakers with equal volumes of water at different temperatures: 10°C, 25°C, and 40°C. 2. Add a small crystal of dye to the center of each beaker at the same time. 3. Measure the time taken for the dye to spread across a fixed distance in each beaker. 4. Repeat the experiment three times for each temperature and calculate the average time.

Temperature (°C)Time for dye to spread (s)
10120
2580
4050
  1. a

    Identify the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how the rate of diffusion changes with temperature based on the results.

    Aim for approximately 2 distinct marking points.

    [2]
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