Chemistry · KS3 Y7 · Particles & States of Matter
Particle model & states
c1Free4:22Heddy Score 2 of 7, below the standardPlays from youtube-nocookie.com. No YouTube cookies until you press play.
What you need to know
- Solids, liquids and gases differ in how closely packed and how free to move their particles are.
- Melting and boiling need energy to overcome the forces between particles; the particles themselves do not change.
- A substance is solid below its melting point, liquid between its melting and boiling points, and gas above its boiling point.
In this clip
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.2/7, Below the standard
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · not judged yet. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
How the Heddy Score worksNot enough students yet
Our own students' answers. These are what move ★7 Proven.Why we picked it
Clear animated overview of the particle model; good first watch before the GCSE states-of-matter cards.
Cognito on YouTubechecked 2026-10-16