4.25 predict the effects of changing the pressure and temperature on the equilibrium position in reversible reactions

NOTE: It is important to remember in reversible reactions one reaction is endothermic and the other is exothermic.

The temperature and pressure of the reactants have a very strong effect on the position of the equilibrium. For example...

Temperature
If you increase the temperature - the endothermic reaction will increase to use up the heat
If you decrease the temperature - the exothermic reaction will increase to raise the heat

Pressure
If you increase the pressure - the reaction will produce the side of the equation that has the least moles (to work this out, just look at the ratio of moles on either side of the equation)
If you decrease the pressure - the reaction will produce the side of the equation that has the most amount of moles