Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The position of equilibrium
20 practice questions
Practice questions
1–10 of 20
Question 1
1 mark · Easy
Answer and see the solution →State what happens to the position of equilibrium if the pressure is increased for a reaction in which the number of moles of gas is greater on the left side of the equation than on the right.
Question 2
3 marks · Easy
Answer and see the solution →The following reversible reaction occurs in a sealed container:
The forward reaction is exothermic.
(a)[1 mark]State whether the position of equilibrium will move to the left or the right if the temperature is increased.
(b)[2 marks]Explain your answer to part (a).
Question 3
2 marks · Easy
Answer and see the solution →Consider the equilibrium reaction in a sealed container:
The forward reaction is exothermic. The system is at equilibrium at 400 K and 2 atm pressure.
Calculate the qualitative effect (increase, decrease or no change) on the amount of at equilibrium if:
(a) the temperature is decreased, but the pressure is kept constant.
(a)[2 marks]State the effect on at equilibrium and explain your answer.
Question 4
2 marks · Easy
Answer and see the solution →The reversible reaction below is in a sealed container at equilibrium:
There are equal numbers of moles of gas on both sides of the equation, and the forward reaction is endothermic.
Explain, with a reason, the effect on the position of equilibrium if the pressure is increased.
Question 5
1 mark · Easy
Answer and see the solution →In a reversible reaction in a sealed container, what happens to the concentrations of reactants and products at equilibrium?
Question 6
3 marks · Easy
Answer and see the solution →A reversible reaction is shown below and is carried out in a sealed container: The forward reaction is endothermic.
(a)[1 mark]State what will happen to the position of equilibrium if the temperature is increased.
(b)[1 mark]State what happens to the amount of if the pressure is decreased.
(c)[1 mark]Give a reason for your answer to part (b).
Question 7
2 marks · Easy
Answer and see the solution →Consider the equilibrium: At equilibrium in a sealed container, there are 2.0 mol of and 4.0 mol of . The forward reaction is exothermic. The temperature is now increased. Calculate the change in the amount of expected at the new equilibrium and explain your answer.
Question 8
4 marks · Normal
Answer and see the solution →Methanol can be produced from carbon monoxide and hydrogen:
This reaction is reversible and carried out in a sealed container.
(a)[2 marks]Explain what happens to the position of equilibrium when the temperature is increased, assuming the forward reaction is exothermic.
(b)[2 marks]Describe how increasing the pressure will affect the position of equilibrium.
Question 9
3 marks · Normal
Answer and see the solution →Ethene (3) reacts reversibly with steam to form ethanol (85):
The forward reaction is exothermic.
Explain, with reasons, the effect of decreasing both temperature and pressure on the yield of ethanol at equilibrium.
Question 10
2 marks · Normal
Answer and see the solution →State and explain what would happen to the position of equilibrium if the pressure is decreased for the following reaction in a sealed container: