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Year 7 - Science

Diffusion through a permeable material: practical

Diffusion

Unit Summary

This unit explores diffusion's role in material movement in and between cells and involves making predictions, observations and measurements with various methods.

Lesson Summary

You will learn to explain observations of diffusion through jelly cubes (a permeable material).

Key Notes

  • Particles of a liquid can move through a material by diffusion if the material is permeable.
  • Observe a liquid diffusing into a jelly cube.
  • Predict and observe effect of temperature on the diffusion of a liquid into a jelly cube.
  • Predict and observe effect of cube size on the diffusion of a liquid into a jelly cube.
  • Use ideas about particles and diffusion to explain these observations.

Vocabulary To Learn

  • diffusion: Diffusion is the net movement of particles of a substance down a concentration gradient.
  • net movement: Net movement is the overall movement of particles from one area to another.
  • permeable: A material is permeable if particles of a liquid are able to move through it.
  • variable: In a science experiment, a variable is a factor that can be changed, kept the same, or measured.
  • prediction: A scientific prediction is a testable statement about a possible outcome of an experiment

Common Mistakes To Avoid

  • Particles cannot diffuse through a seemingly solid material.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Particles of a liquid can move through a material by diffusion if the material is permeable. Observe a liquid diffusing into a jelly cube.

2. Define this scientific word and use it in context. 'diffusion'

Diffusion is the net movement of particles of a substance down a concentration gradient. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Particles cannot diffuse through a seemingly solid material. Correction: This practical lesson enables pupils to observe the diffusion of acid through permeable cubes of coloured jelly.

More Lessons In This Unit

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