Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Physical Chemistry
442 practice questions
Topics covered
Practice questions
131–140 of 183 · Easy
Question 131
1 mark · Easy
Answer and see the solution →State what term is used when the rate of the forward reaction equals the rate of the backward reaction in a sealed system.
Question 132
3 marks · Easy
Answer and see the solution →When heating ammonium chloride in a sealed test tube, a reversible reaction takes place.
(a)[1 mark]Write a chemical equation to show the decomposition of ammonium chloride on heating.
(b)[1 mark]State the names of the products formed during the decomposition.
(c)[1 mark]Give a reason why the reaction is reversible.
Question 133
1 mark · Easy
Answer and see the solution →State the chemical formula of the white solid that forms when ammonia and hydrogen chloride gases react together in a sealed tube.
Question 134
2 marks · Easy
Answer and see the solution →A reversible reaction occurs in a sealed container. At the start, there are 80 blue squares representing reactant molecules. Every second, one fifth of the blue squares turn yellow (product molecules). After one second, how many blue squares remain? Show your calculation.
Question 135
1 mark · Easy
Answer and see the solution →State what happens to the position of equilibrium if the pressure is increased for a reaction in which the number of moles of gas is greater on the left side of the equation than on the right.
Question 136
3 marks · Easy
Answer and see the solution →The following reversible reaction occurs in a sealed container:
The forward reaction is exothermic.
(a)[1 mark]State whether the position of equilibrium will move to the left or the right if the temperature is increased.
(b)[2 marks]Explain your answer to part (a).
Question 137
2 marks · Easy
Answer and see the solution →Consider the equilibrium reaction in a sealed container:
The forward reaction is exothermic. The system is at equilibrium at 400 K and 2 atm pressure.
Calculate the qualitative effect (increase, decrease or no change) on the amount of at equilibrium if:
(a) the temperature is decreased, but the pressure is kept constant.
(a)[2 marks]State the effect on at equilibrium and explain your answer.
Question 138
2 marks · Easy
Answer and see the solution →The reversible reaction below is in a sealed container at equilibrium:
There are equal numbers of moles of gas on both sides of the equation, and the forward reaction is endothermic.
Explain, with a reason, the effect on the position of equilibrium if the pressure is increased.
Question 139
1 mark · Easy
Answer and see the solution →In a reversible reaction in a sealed container, what happens to the concentrations of reactants and products at equilibrium?
Question 140
3 marks · Easy
Answer and see the solution →A reversible reaction is shown below and is carried out in a sealed container: The forward reaction is endothermic.
(a)[1 mark]State what will happen to the position of equilibrium if the temperature is increased.
(b)[1 mark]State what happens to the amount of if the pressure is decreased.
(c)[1 mark]Give a reason for your answer to part (b).