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Year 7 - Science

Diffusion

Solutions

Unit Summary

This unit explores the concepts of pure substances, mixtures, and diffusion in liquids and gases. It emphasises accuracy, precision, and the use of appropriate techniques during investigations. The focus is on making predictions and recording reliable observations.

Lesson Summary

You will learn to explain how particles spread through a fluid.

Key Notes

  • Brownian motion is the random motion of particles suspended in a medium.
  • Particles of a substance released into a fluid (a gas or liquid) move around and are pushed by other particles.
  • Substances that have particles that are free to move will eventually reach a random distribution throughout.
  • At higher temperatures, particles in a gas or solution move more quickly.

Vocabulary To Learn

  • diffusion: The movement of particles from an area where there are lots, until there is a random distribution of particles throughout a medium.
  • random: Happens without a clear pattern, making it unpredictable.
  • Brownian motion: The random movement of particles in a fluid, due to colliding with particles in the surrounding medium.
  • medium: A medium is usually a liquid or gas that other substances can mix into or move through, enabling other substances to mix or interact.
  • fluid: A fluid is a substance that flows or takes the shape of its container. Liquids and gases can be described as fluids.

Common Mistakes To Avoid

  • Pupil confuse diffusion and Brownian motion.

3 Quick Questions (With Answers)

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

Brownian motion is the random motion of particles suspended in a medium. Particles of a substance released into a fluid (a gas or liquid) move around and are pushed by other particles.

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

The movement of particles from an area where there are lots, until there is a random distribution of particles throughout a medium. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupil confuse diffusion and Brownian motion. Correction: Brownian motion is the random movement of particles due to collisions. Diffusion is due to concentration differences between 2 substances.

More Lessons In This Unit

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