Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Changing the pressure
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State why changing the pressure affects only equilibria involving gases, and only when the numbers of gaseous molecules on each side of the equation are different.
Question 2
4 marks · Normal
Answer and see the solution →The following reaction takes place in a closed container:
(a)[1 mark]State the total number of moles of gas on each side of this equation.
(b)[3 marks]The pressure of the system is increased. Predict and explain the direction in which the equilibrium will shift.
Question 3
3 marks · Normal
Answer and see the solution →The reaction below is allowed to reach equilibrium in a sealed container:
Explain, using the number of moles of gas, what will happen to the position of equilibrium if the pressure is decreased.
Question 4
4 marks · Normal
Answer and see the solution →Consider the following data collected for this equilibrium reaction:
Condition % M(g) % N(g) % Q(g) Low pressure 40 40 20 High pressure 45 45 10 (a)[1 mark]What is the total number of moles of gas on each side of the equation?
(b)[2 marks]Describe the effect that increasing pressure has on the amounts of M(g), N(g), and Q(g).
(c)[1 mark]Explain your answer to (b) in terms of the number of gas molecules.
Question 5
1 mark · Normal
Answer and check →Consider the following equilibrium:
What will happen to the position of equilibrium if the pressure is increased?
- A.It shifts to the left (towards \ce{F2})
- B.It shifts to the right (towards \ce{F})
- C.No effect
- D.It shifts to both sides equally
Question 6
2 marks · Normal
Answer and see the solution →For equilibria involving only solids and liquids, changing the pressure has very little effect. Give two reasons why.
Question 7
4 marks · Normal
Answer and see the solution →Carbon monoxide and hydrogen react according to the following equation:
(a)[1 mark]How many moles of gaseous molecules are there on each side of the equation?
(b)[3 marks]If the pressure is increased, what happens to the position of equilibrium? Explain your answer.
Question 8
3 marks · Normal
Answer and see the solution →The following reaction is allowed to reach equilibrium in a sealed container:
The number of gaseous molecules on each side of the equation is different.
Explain, with calculations, why increasing the pressure will affect this equilibrium, and state which side the equilibrium will shift towards. Use the number of moles of gas in your answer.