3.1.6 Chemical Equilibria, Le Chatelier's Principle and Kc

Define ‘dynamic equilibrium’.

The rate of the forward reaction is equal to the rate of the reverse reaction.

Give an essential condition for an equilibrium mixture.

Equilibrium occurs in a closed system (where reactants and products cannot escape)

State Le Chatelier’s principle

If a system at equilibrium is disturbed, the equilibrium moves in the direction that tends to reduce the disturbance.

What effect does temperature have on equilibrium on a forward=exothermic reaction?

• Increasing temperature would shift equilibrium to the left as it favours endothermic.

• Decreasing temperature would shift equilibrium to the right as it favours exothermic.