Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Reversible Reactions and Equilibria
144 practice questions
Topics covered
- Reversibility and dynamic equilibria19 practice questions
- Reversible reactions in a sealed container18 practice questions
- The position of equilibrium20 practice questions
- Changing the pressure19 practice questions
- Changing the temperature19 practice questions
- Adding a catalyst19 practice questions
- The effect of concentration19 practice questions
Practice questions
51–60 of 144
Question 51
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 52
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 53
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 54
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 55
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 56
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 57
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.
Question 58
1 mark · Easy
Answer and see the solution →State the type of reactions, in terms of phases, that are affected by changes in pressure at equilibrium.
Question 59
3 marks · Easy
Answer and see the solution →Nitrogen dioxide and dinitrogen tetroxide are involved in the following equilibrium:
(a)[1 mark]State the total number of gaseous molecules on each side of the equation.
(b)[1 mark]If the pressure of the system is increased, predict which direction the equilibrium will shift.
(c)[1 mark]Explain your answer to part (b) in terms of gas molecules.
Question 60
2 marks · Easy
Answer and see the solution →For the following equilibrium reaction, calculate the difference in the total number of gaseous molecules between the left and right sides.