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Chemistry · Paper 2 · Foundation + Higher

Catalysts and activation energy

Key ideas1 of 3

Speed up without being used up

A catalyst increases reaction rate and is not used up overall. Different reactions need different catalysts. Enzymes are biological catalysts.

Two energy pathways have the same reactant and product levels. The red route has a lower peak than the grey route.

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Practice, downloads and sources

Daily 5 · Exam practice · Revision sheet ↓

Foundation + Higher. C6 · Rate and extent of chemical change.

AQA Combined Science Trilogy 8464 · 5.6.1.4. Original teaching notes, questions and diagrams. Animations are simplified models; speeds and practical readings are illustrative.