What you'll learn
Reaction rates and energy changes.
Key ideas
- Factors affecting rate: temperature, concentration, surface area, catalysts (collision theory).
- Exothermic vs endothermic reactions and activation energy.
Exam tips
- Explain rate using collision frequency and energy.
- A catalyst lowers activation energy and isn't used up.
Common mistakes
- Saying a catalyst is used up.
- Confusing exothermic and endothermic.