Exercise 1 — IGCSE 0654 Nov 2023 Paper 43 Q5
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Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry
Diffusion
Key knowledge — States Of Matter Particles
Key facts & rules
- Solid: particles close together in a regular lattice, vibrate in fixed positions.
- Liquid: particles close together but random arrangement, free to move past each other.
- Gas: particles far apart, random, move rapidly in all directions.
- Melting: solid → liquid (at melting point). Boiling: liquid → gas (at boiling point).
- Condensation: gas → liquid. Freezing/Solidification: liquid → solid. Sublimation: solid → gas directly.
- Kinetic theory: particles are always moving; higher temperature = higher average kinetic energy.
- Diffusion: particles spread from high to low concentration. Faster in gases than liquids.
- Brownian motion: random movement of particles in a fluid, caused by collisions with invisible molecules.
IGCSE Chemistry — Diffusion
1 Cambridge IGCSE 0654 questions on diffusion, across all three components.
About diffusion on IGCSE 0654
Every Cambridge IGCSE Co-ordinated Sciences 0654 question on diffusion (States of matter & particles, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.
Theory
Diffusion — Extended theory questions1 total · Paper 4