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 复习笔记 3.2.4 Activation Energy
Edexcel IGCSE Chemistry 复习笔记 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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