Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The effect of concentration
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →For the following equilibrium in solution:
State what will happen to the position of equilibrium if more B is added to the mixture.
Question 2
3 marks · Easy
Answer and see the solution →The following reversible reaction is at equilibrium in a closed container:
A chemist removes some G(g) from the equilibrium mixture.
(a)[1 mark]State how the position of equilibrium will change.
(b)[1 mark]Give a reason for your answer in (a).
(c)[1 mark]Name the principle that explains your answer.
Question 3
2 marks · Easy
Answer and see the solution →A system is at equilibrium with the following reaction:
At equilibrium, the concentration of Z is 4.0 mol/dm^3. If 2.0 mol/dm^3 of Z is suddenly removed, how many moles per dm^3 of Z will form to restore equilibrium? Assume all change is due to the forward reaction.
Question 4
2 marks · Easy
Answer and see the solution →The following reaction is at equilibrium in a sealed container:
Explain, in terms of concentration, what will happen to the position of equilibrium if extra KL(g) is added.
Question 5
3 marks · Easy
Answer and see the solution →The equilibrium below is set up in a sealed vessel:
The graph shows how the concentration of AB(g) changes after some B2(g) is added:
Concentration of AB(g) vs. time after B2(g) is added. (a)[1 mark]Describe what happens to [AB] after B2(g) is added.
(b)[2 marks]Predict and explain the direction in which the position of equilibrium shifts after B2(g) is added.
Question 6
1 mark · Easy
Answer and see the solution →The equilibrium below is reached in a closed vessel:
State what happens to the position of equilibrium if some HI(g) is removed.
Question 7
3 marks · Easy
Answer and see the solution →Methanol (3e{CH3OH}) is produced in industry by the following equilibrium:
A technician increases the concentration of hydrogen gas (62e{H2}).
(a)[1 mark]State the effect on the position of equilibrium.
(b)[2 marks]Explain your answer in (a).
Question 8
2 marks · Easy
Answer and see the solution →The reaction below is at equilibrium:
At equilibrium, [Q] is 3.0 mol/dm^3 and [P] is 1.0 mol/dm^3. If 0.5 mol/dm^3 of Q is removed, what will [Q] be after the change is compensated and equilibrium is restored? Assume the system restores [Q] to the original value.