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
71–80 of 144
Question 71
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 72
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 73
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.
Question 74
2 marks · Hard
Answer and see the solution →Consider the following reversible reaction, which takes place in a sealed vessel at constant temperature:
Explain why changing the pressure will or will not affect the position of equilibrium for this reaction.
Question 75
5 marks · Hard
Answer and see the solution →The equation for a reaction that reaches equilibrium in a sealed container is:
A student investigates how changing the pressure affects this equilibrium.
(a)[1 mark]State the total number of moles of gaseous molecules on each side of the equation.
(b)[2 marks]Predict, with a reason, what will happen to the position of equilibrium if the pressure in the container is increased.
(c)[2 marks]If the pressure is decreased, which side of the equilibrium will be favoured? Explain your answer.
Question 76
2 marks · Hard
Answer and see the solution →Explain, using the idea of gaseous molecules, why changing the pressure does not influence the equilibrium position in reactions involving only solids and liquids.
Question 77
1 mark · Easy
Answer and see the solution →The equation below shows a reversible reaction. The enthalpy change for the forward reaction is . State whether the forward reaction is exothermic or endothermic.
Question 78
3 marks · Easy
Answer and see the solution →(a)[1 mark]What is meant by the term 'position of equilibrium' in a reversible reaction?
(b)[1 mark]State how increasing the temperature affects the position of equilibrium in a reversible reaction.
(c)[1 mark]State how decreasing the temperature affects the position of equilibrium in a reversible reaction.
Question 79
2 marks · Easy
Answer and see the solution →The reaction below is at equilibrium: for the forward reaction. Explain, using the value of , the effect on the amount of present at equilibrium if the temperature is increased.
Question 80
2 marks · Easy
Answer and see the solution →A reversible reaction has for the forward reaction. Explain how you can tell from the value whether the forward reaction is exothermic or endothermic.