Edexcel IAL Chemistry AS 9.5 Catalysts and alternative pathways
Edexcel IAL Chemistry AS 9.5 Catalysts and alternative pathways
State both the alternative route and lower Eₐ, then use rate evidence to identify a catalyst while keeping reactant/product energy levels and K unchanged.
How this is tested
- State that a catalyst supplies an alternative pathway with lower activation energy.
- Use reaction-time evidence to identify which added substance acts as a catalyst.
- Explain that a catalyst changes Eₐ but not ΔH, equilibrium position or equilibrium constant.