Changing the temperature
3 marks · EasyWhat is meant by the term 'position of equilibrium' in a reversible reaction?
State how increasing the temperature affects the position of equilibrium in a reversible reaction.
State how decreasing the temperature affects the position of equilibrium in a reversible reaction.
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(a) The relative amounts of reactants and products present at equilibrium. · must show relative amounts of reactants/products
(b) It shifts to favour the endothermic direction or reaction. · must show favours endothermic
(c) It shifts to favour the exothermic direction or reaction. · must show favours exothermic
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Marking points
B1 (a) · 1 mark · Gives the correct definition for position of equilibrium.
B1 (b) · 1 mark · States position shifts in favour of endothermic direction on increasing temperature.
B1 (c) · 1 mark · States position shifts in favour of exothermic direction on decreasing temperature.
Worked solution
a) The position of equilibrium describes the relative amounts of reactants and products present when the rates of forward and reverse reactions are equal. b) Increasing the temperature shifts the equilibrium position in favour of the endothermic reaction. c) Decreasing the temperature shifts the equilibrium position in favour of the exothermic reaction.