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States of matter
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Particle model and the three states

Particle model and the three states

Particle diagrams showing solid, liquid and gas with labelled state changes

Chemists use the particle model to explain matter as tiny particles with spaces between them. It is a simplified picture, but it helps us link what we observe to particle arrangement and motion.

States of matter Lesson

  1. IGCSE
  2. /Chemistry
  3. /States of matter

Step-by-step lessons on Edexcel IGCSE Chemistry States of matter. Each one builds up to exam-style questions. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.

Lessons