Diffusion in gases
2 marks · NormalExplain what is meant by diffusion in gases, using the idea of particles.
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Also accept: Particles in a gas move and spread out from areas of high concentration to low concentration until evenly mixed.
Common mistakes: Forgetting to mention that diffusion occurs from high to low concentration.; Describing only air movement, not referring to particles.
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Marking points
B1 · 1 mark · States that diffusion is the spreading out of particles.
B2 · 1 mark · Mentions movement from high concentration to low concentration.
Worked solution
Diffusion in gases is the process where particles move from an area where they are at a high concentration to an area where they are at a low concentration, until the particles are evenly spread out.