What you'll learn
Energy in chemical reactions.
Key ideas
- Exothermic (release) vs endothermic (absorb) reactions.
- Activation energy; bond breaking (endo) and making (exo).
Exam tips
- Combustion is exothermic.
- Explain reactions using bond energies.
Common mistakes
- Confusing exothermic and endothermic.
- Reversing bond-making/breaking energy.