Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Changing the temperature
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →The equation below shows a reversible reaction. The enthalpy change for the forward reaction is . State whether the forward reaction is exothermic or endothermic.
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]What is meant by the term 'position of equilibrium' in a reversible reaction?
(b)[1 mark]State how increasing the temperature affects the position of equilibrium in a reversible reaction.
(c)[1 mark]State how decreasing the temperature affects the position of equilibrium in a reversible reaction.
Question 3
2 marks · Easy
Answer and see the solution →The reaction below is at equilibrium: for the forward reaction. Explain, using the value of , the effect on the amount of present at equilibrium if the temperature is increased.
Question 4
2 marks · Easy
Answer and see the solution →A reversible reaction has for the forward reaction. Explain how you can tell from the value whether the forward reaction is exothermic or endothermic.
Question 5
3 marks · Easy
Answer and see the solution →Equilibrium composition for a reaction at two temperatures. Temperature (°C) % S at equilibrium % T at equilibrium 350 30 70 600 55 45 (a)[1 mark]At which temperature is there more S at equilibrium?
(b)[1 mark]Describe how increasing temperature affects the position of equilibrium in this reaction.
(c)[1 mark]Suggest whether the forward reaction is likely to be exothermic or endothermic. Explain your answer.
Question 6
1 mark · Easy
Answer and see the solution →In a reversible reaction where the forward reaction is endothermic, what effect does decreasing the temperature have on the direction of equilibrium?
Question 7
3 marks · Easy
Answer and see the solution →(a)[1 mark]Consider a reversible reaction: Explain whether the forward reaction is exothermic or endothermic.
(b)[2 marks]If the temperature is increased, which direction of reaction will be favoured? Explain your answer.
Question 8
2 marks · Easy
Answer and see the solution →For the reaction below, predict which direction the position of equilibrium will shift if the temperature is decreased. , \( \Delta H = +110\ \text{kJ/mol} \ )