What you'll learn
Reversible reactions and equilibrium.
Key ideas
- Reversible reactions (⇌); dynamic equilibrium (equal forward/backward rates) in a closed system.
- Le Chatelier's principle: a system opposes change.
Exam tips
- Recognise the ⇌ symbol.
- Predict shifts using Le Chatelier.
Common mistakes
- Thinking reactions stop at equilibrium.
- Ignoring the need for a closed system.