Changing the temperature
3 marks · EasyConsider a reversible reaction: Explain whether the forward reaction is exothermic or endothermic.
If the temperature is increased, which direction of reaction will be favoured? Explain your answer.
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(a) Endothermic · must show endothermic
(b) The forward reaction will be favoured. Increasing temperature favours the endothermic reaction, and the forward reaction is endothermic (ΔH positive). · must show forward reaction favoured, temperature increase favours endothermic
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Marking points
B1 (a) · 1 mark · Correctly identifies the forward reaction as endothermic (since ΔH is positive).
M1 (b) · 1 mark · States that increasing temperature favours the endothermic direction.
A1 (b) · 1 mark · Concludes that the forward reaction is favoured because it is endothermic.
Worked solution
a) The ΔH is positive, so the forward reaction is endothermic. b) Increasing temperature favours the endothermic direction, which here is the forward reaction.