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

Changing the temperature

19 practice questions

Start practising (19 questions)

Practice questions

1–10 of 19

  1. Question 1

    1 mark · Easy

    The equation below shows a reversible reaction. The enthalpy change for the forward reaction is . State whether the forward reaction is exothermic or endothermic.

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  2. Question 2

    3 marks · Easy

    (a)

    What is meant by the term 'position of equilibrium' in a reversible reaction?

    [1 mark]
    (b)

    State how increasing the temperature affects the position of equilibrium in a reversible reaction.

    [1 mark]
    (c)

    State how decreasing the temperature affects the position of equilibrium in a reversible reaction.

    [1 mark]
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  3. Question 3

    2 marks · Easy

    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.

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  4. Question 4

    2 marks · Easy

    A reversible reaction has for the forward reaction. Explain how you can tell from the value whether the forward reaction is exothermic or endothermic.

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  5. Question 5

    3 marks · Easy

    Equilibrium composition for a reaction at two temperatures.
    Temperature (°C)% S at equilibrium% T at equilibrium
    3503070
    6005545
    (a)

    At which temperature is there more S at equilibrium?

    [1 mark]
    (b)

    Describe how increasing temperature affects the position of equilibrium in this reaction.

    [1 mark]
    (c)

    Suggest whether the forward reaction is likely to be exothermic or endothermic. Explain your answer.

    [1 mark]
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  6. Question 6

    1 mark · Easy

    In a reversible reaction where the forward reaction is endothermic, what effect does decreasing the temperature have on the direction of equilibrium?

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  7. Question 7

    3 marks · Easy

    (a)

    Consider a reversible reaction: Explain whether the forward reaction is exothermic or endothermic.

    [1 mark]
    (b)

    If the temperature is increased, which direction of reaction will be favoured? Explain your answer.

    [2 marks]
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  8. Question 8

    2 marks · Easy

    For the reaction below, predict which direction the position of equilibrium will shift if the temperature is decreased. , \( \Delta H = +110\ \text{kJ/mol} \ )

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  9. Question 9

    2 marks · Normal

    State how changing the temperature affects the position of equilibrium in a reversible reaction.

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  10. Question 10

    4 marks · Normal

    For the following reversible reaction, answer the questions below:

    (a)

    Is the forward reaction exothermic or endothermic? Explain your reasoning.

    [1 mark]
    (b)

    What will happen to the position of equilibrium if the temperature is increased? Explain your answer.

    [2 marks]
    (c)

    State whether more SO3 or more SO2 will be present at equilibrium if the temperature is decreased. Give a reason for your answer.

    [1 mark]
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