Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Physical Chemistry
442 practice questions
Topics covered
Practice questions
51–60 of 71 · Hard
Question 51
2 marks · Hard
Answer and see the solution →In an experiment, solid ammonium chloride is heated in a sealed tube. Name the two gases that form, and state what happens when they meet in a cooler part of the tube.
Question 52
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 53
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 54
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 55
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 56
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 57
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 58
2 marks · Hard
Answer and see the solution →A reversible reaction is at equilibrium. The forward reaction is exothermic. Explain what happens to the position of equilibrium if the temperature is increased.
Question 59
5 marks · Hard
Answer and see the solution →The following reversible reaction is at equilibrium:
(a)[2 marks]State whether the forward reaction is exothermic or endothermic. Explain how you know.
(b)[3 marks]If the position of equilibrium shifts to the right when the temperature is changed, is the temperature being increased or decreased? Explain your reasoning using the ΔH value.
Question 60
2 marks · Hard
Answer and see the solution →For the following equilibrium reaction:
State how increasing the temperature will affect the position of equilibrium. Give your answer for both cases: (i) forward reaction is exothermic; (ii) forward reaction is endothermic.