Diagram shows that a catalyst increases the rate of a reaction by providing an alternative pathway which has a lower activation energy
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 3.2.4 Activation Energy
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 3.2.4 Activation Energy
Reaction Profiles
Reaction Profiles Showing ?H and EA
- Catalysts?provide the reactants another pathway which has a lower activation energy
- By lowering?Ea,?a?greater proportion?of molecules in the reaction mixture have sufficient energy for an?effective collision
- As a result of this, the rate of the catalysed reaction is increased compared to the uncatalyzed reaction
Exam Tip
The activation energy is constant for a particular reaction. Reactions with a low activation energy occur readily as little energy is needed to break the bonds and initiate the reaction.
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