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Learning objective

Conduct an investigation into the factors affecting diffusion, specifically: surface area, temperature, concentration gradient, and distance.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE Combined ScienceMovement into and out of cellsSupplement contentPractical objective

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Quick explanation

Conduct an investigation into the factors affecting diffusion, specifically: surface area, temperature, concentration gradient, and distance

  • This point belongs to Diffusion, especially Diffusion outcomes.
  • You need to be able to conduct an investigation into the factors affecting diffusion, specifically: surface area, temperature, concentration gradient, and distance.
  • The key ideas to know are Evaluate and Examine.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

EvaluateExamine

Why it matters

This objective helps connect Diffusion outcomes to exam-style questions, flashcards, and revision notes for Diffusion.

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Practice Questions7 linked questions

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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]
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