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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section

The effect of concentration

19 practice questions

Practice questions

1–8 of 8 · Easy

  1. Question 1

    1 mark · Easy

    For the following equilibrium in solution:

    State what will happen to the position of equilibrium if more B is added to the mixture.

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  2. Question 2

    3 marks · Easy

    The following reversible reaction is at equilibrium in a closed container:

    A chemist removes some G(g) from the equilibrium mixture.

    (a)

    State how the position of equilibrium will change.

    [1 mark]
    (b)

    Give a reason for your answer in (a).

    [1 mark]
    (c)

    Name the principle that explains your answer.

    [1 mark]
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  3. Question 3

    2 marks · Easy

    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.

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  4. Question 4

    2 marks · Easy

    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.

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  5. Question 5

    3 marks · Easy

    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) over time012345678012345678Time (s)Concentration of AB (mol/dm^3)Concentration of AB(g) over time
    Concentration of AB(g) vs. time after B2(g) is added.
    (a)

    Describe what happens to [AB] after B2(g) is added.

    [1 mark]
    (b)

    Predict and explain the direction in which the position of equilibrium shifts after B2(g) is added.

    [2 marks]
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  6. Question 6

    1 mark · Easy

    The equilibrium below is reached in a closed vessel:

    State what happens to the position of equilibrium if some HI(g) is removed.

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  7. Question 7

    3 marks · Easy

    Methanol (3e{CH3OH}) is produced in industry by the following equilibrium:

    A technician increases the concentration of hydrogen gas (62e{H2}).

    (a)

    State the effect on the position of equilibrium.

    [1 mark]
    (b)

    Explain your answer in (a).

    [2 marks]
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  8. Question 8

    2 marks · Easy

    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.

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