Chemistry · GCSE · Rates & Equilibrium
Energy changes in reversible reactions
Energy changes in reversible reactionsFree1:54Heddy Score 3 of 7, below the standard
What you need to know
- If a reversible reaction is exothermic in one direction, it is endothermic in the other.
- Raising the temperature favours the endothermic direction; lowering it favours the exothermic direction.
- In the cobalt chloride demonstration, heating shifts the equilibrium to the blue side and cooling shifts it back to pink.
- The same demonstration shows concentration effects: adding hydrochloric acid turns it blue and adding water turns it pink.
In this clip
Runs 1:54, from 7:49 to 9:43 of the full video.
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.3/7, Below the standard
See the seven stars
- 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 · passed. 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
Not enough students yet
Our own students' answers. These are what move ★7 Proven.On YouTube
How the Heddy Score works2.77M views · 33.5K likes · CrashCourse 17.3M subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
Explains dynamic equilibrium and Le Chatelier's principle with the Haber process, then makes the temperature effect visible with a colour-changing demonstration.
CrashCourse on YouTubechecked 2026-10-22
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