Chemical equilibria and Le Chatelier's principle (AQA A level Chemistry)

Many chemical reactions are reversible.

In a reversible reaction at equilibrium:
•• forward and reverse reactions proceed at equal rates
•• the concentrations of reactants and products remain
constant.

Le Chatelier’s principle.

Le Chatelier's principle can be used to predict the effects of
changes in temperature, pressure and concentration on the
position of equilibrium in homogeneous reactions.

A catalyst does not affect the position of equilibrium.
Students should be able to:
•• use Le Chatelier’s principle to predict qualitatively
the effect of changes in temperature, pressure and
concentration on the position of equilibrium
•• explain why, for a reversible reaction used in an industrial
process, a compromise temperature and pressure may
be used.