Chemistry · KS3 Y8 · Particles & States of Matter
Chromatography
c17Free4:35Heddy Score 2 of 7, below the standardPlays from youtube-nocookie.com. No YouTube cookies until you press play.
What you need to know
- The starting line is drawn in pencil so it does not run.
- Spots must sit above the solvent level.
- Rf equals distance moved by the spot over distance moved by the solvent.
In this clip
0:00–4:35Chromatography and Rf valuesgcse-chem-5-8-1-3Heddy 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
GCSE required practical on paper chromatography and calculating Rf values.
Freesciencelessons on YouTubechecked 2026-10-16