Edexcel IAL Chemistry AS 9.2 Activation energy and successful collisions
Edexcel IAL Chemistry AS 9.2 Activation energy and successful collisions
Read Eₐ from the reactant level to the profile peak, then reject collisions below that minimum even when particles meet; temperature changes the qualifying fraction.
How this is tested
- Identify activation energy as the minimum collision energy shown on a reaction profile.
- Explain unsuccessful collisions by insufficient energy rather than concentration or equilibrium.
- Link high activation barriers to repulsion or bond breaking when the context provides it.