Changing the temperature
2 marks · EasyFor the reaction below, predict which direction the position of equilibrium will shift if the temperature is decreased. , \( \Delta H = +110\ \text{kJ/mol} \ )
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The equilibrium position will shift to the left (reverse reaction), favouring the exothermic direction.
Also accept: Equilibrium shifts to the side of 2M(g); Reverse reaction is favoured
Common mistakes: States equilibrium shifts right
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Marking points
M1 · 1 mark · Identifies that forward reaction is endothermic (ΔH is positive).
A1 · 1 mark · Correctly predicts shift to left (exothermic/reverse reaction) when temperature is decreased.
Worked solution
ΔH is positive, so the forward reaction is endothermic. Decreasing temperature favours the exothermic (reverse) direction. The position of equilibrium shifts to the left, producing more M(g).