Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Physical Chemistry
442 practice questions
Topics covered
Practice questions
151–160 of 183 · Easy
Question 151
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 152
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 153
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 154
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 155
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 156
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 157
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} \ )
Question 158
1 mark · Easy
Answer and see the solution →State the effect of adding a catalyst on the position of equilibrium in a reversible chemical reaction.
Question 159
3 marks · Easy
Answer and see the solution →(a)A reversible reaction mixture is at equilibrium. A catalyst is added to the system.
Explain what happens to:
(i)[1 mark]the rate at which the equilibrium is reached,
(ii)[1 mark]the position of equilibrium,
(iii)[1 mark]the amount of products at equilibrium.
Question 160
2 marks · Easy
Answer and see the solution →In a reversible reaction at equilibrium, the rate of the forward reaction is 0.6 mol/dm³/s and the rate of the reverse reaction is also 0.6 mol/dm³/s. A catalyst is added and both rates are increased by a factor of 5.
Calculate the new rate of the forward reaction, and state whether the position of equilibrium will change.