Chemistry · GCSE · Rates & Equilibrium
Rate graphs and tangents
Rate graphs and tangentsFree2:00Heddy Score 3 of 7, below the standard
What you need to know
- A tangent touches a rate curve at the point representing the chosen time.
- Calculate the tangent’s gradient using the change in the vertical quantity divided by the change in time.
- This gradient estimates the reaction rate at that instant.
In this clip
Runs 2:00, from 1:14 to 3:14 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 works584K views · 6.79K likes · Freesciencelessons 995K subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
The worked tangent method shows how to find an instantaneous reaction rate.
Freesciencelessons on YouTubechecked 2026-10-18
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