Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The position of equilibrium
20 practice questions
Practice questions
11–20 of 20
Question 11
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 12
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 13
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 14
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 15
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 16
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 17
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.
Question 18
2 marks · Hard
Answer and see the solution →The equilibrium below is set up in a sealed container: \[ \ce{2X(g) <=> Y(g) + 2Z(g)} \] The forward reaction is exothermic. State and explain what will happen to the position of equilibrium if the temperature is increased.
Question 19
5 marks · Hard
Answer and see the solution →In a sealed container at equilibrium, the following reaction occurs:
The forward reaction is exothermic.
(a)[2 marks]State how an increase in pressure will affect the position of equilibrium. Explain your answer.
(b)[2 marks]Describe what happens to the position of equilibrium if the temperature is decreased. Explain your answer.
(c)[1 mark]If some AB(g) is removed from the container, what will happen to the amounts of A2(g), B2(g), and AB(g) as the system re-establishes equilibrium? Explain.
Question 20
2 marks · Hard
Answer and see the solution →For the reversible reaction in a sealed container: \[ \ce{C(g) <=> D(g) + E(g)} \] Give one change that would cause the position of equilibrium to shift to the right. Explain your answer.