Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The position of equilibrium
20 practice questions
Practice questions
1–10 of 10 · Normal
Question 1
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 2
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 3
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:
Question 4
4 marks · Normal
Answer and see the solution →Ammonia is made in the Haber process:
The forward reaction is exothermic.
(a)[2 marks]Explain what happens to the yield of ammonia if the temperature is increased.
(b)[2 marks]Describe and explain the effect of increasing pressure on the position of equilibrium.
Question 5
2 marks · Normal
Answer and see the solution →A reversible reaction is shown below: The forward reaction is exothermic. Explain what will happen to the position of equilibrium if the temperature is increased.
Question 6
3 marks · Normal
Answer and see the solution →Hydrogen iodide is formed in the reversible reaction: The forward reaction is endothermic. A closed container starts with 0.50 mol of hydrogen, 0.50 mol of iodine, and no hydrogen iodide. The mixture is allowed to reach equilibrium. State and explain what will happen to the amount of hydrogen iodide present at equilibrium if the pressure is doubled (assume temperature is kept constant and all substances are gases, with equal volumes occupied).
Question 7
1 mark · Normal
Answer and see the solution →For the equilibrium reaction:
The forward reaction is exothermic. What will happen to the concentration of PCl5 if the temperature is increased at constant pressure?
- A.It will increase.
- B.It will decrease.
- C.It will stay the same.
- D.It will fluctuate.
Question 8
2 marks · Normal
Answer and see the solution →A reversible reaction occurs in a sealed container: . The forward reaction is exothermic.
State what happens to the position of equilibrium if:
(a)[1 mark]the temperature is increased.
(b)[1 mark]the pressure is increased.
Question 9
4 marks · Normal
Answer and see the solution →Consider the following equilibrium established in a sealed container:
The forward reaction is endothermic.
(a)[2 marks]State and explain what will happen to the position of equilibrium if the temperature is decreased.
(b)[2 marks]State and explain what will happen to the position of equilibrium if the pressure is increased.
Question 10
3 marks · Normal
Answer and see the solution →The following equilibrium is established in a sealed container at constant temperature:
The forward reaction is exothermic.
The system is at equilibrium with the following amounts:
Substance Amount (mol) D 0.80 E 1.60 F 0.60 G 0.60 (a)[3 marks]The pressure on the system is increased. Predict, with a calculation, which direction the equilibrium will shift. Show your working.