AP Chemistry / Unit 7: Equilibrium
7.10 Reaction Quotient and Le Châtelier's Principle
Notes
Compare $Q$ with $K$:
- $Q<K$: shift right (forward).
- $Q>K$: shift left (reverse).
- $Q=K$: at equilibrium.
- Only temperature changes $K$.
Practice
$Q=0.5$ and $K=2$. The reaction shifts:
$Q<K$.
Which changes the value of $K$?
$K$ depends on $T$.
$Q>K$ means there's too much:
Shift back to reactants.
Ready for more? Take the Unit 7 test.