Lesson 4.6.2.6

4.6.2.6 The effect of temperature changes on equilibrium (HT only) Quiz: AQA Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.6.2.6, The effect of temperature changes on equilibrium (HT only): 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 6: The rate and extent of chemical change, written with Revision Ninja.

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The 20 questions

  1. What happens to the relative amount of products in an endothermic equilibrium reaction when heated?

    • Decreases
    • Increases
    • Drops to zero
    • Stays constant

  2. What happens to product yield when an exothermic equilibrium reaction is cooled?

    • Halves
    • Decreases
    • Stays constant
    • Increases

  3. Which term describes a reaction that transfers thermal energy to the surroundings?

    • Catalysed
    • Exothermic
    • Endothermic
    • Balanced

  4. For an endothermic forward reaction at equilibrium, what happens to the relative amount of products when temperature is decreased?

    • It increases
    • It doubles
    • It stays constant
    • It decreases

  5. In which direction does an exothermic equilibrium shift when the temperature is raised?

    • Towards the reactants
    • Not at all
    • Towards the products
    • Towards the catalyst

  6. If the forward reaction is exothermic, what type of reaction is the reverse?

    • Neutral
    • Endothermic
    • Catalysed
    • Exothermic

  7. What does the relative amount of products at equilibrium measure?

    • Temperature
    • Mass
    • Proportion
    • Volume

  8. Heating a reaction mixture that is already at equilibrium directly changes which variable?

    • Temperature
    • Pressure
    • Surface area
    • Concentration

  9. When the endothermic equilibrium system N2O4(g) ⇌ 2NO2(g) is heated, what happens to its colour?

    • Removes colour
    • Becomes paler
    • Turns blue
    • Becomes darker

  10. What happens to the ammonia yield in the Haber process if the temperature is raised?

    • Doubles
    • Decreases
    • Stays constant
    • Increases

  11. Which change decreases product yield in an exothermic equilibrium?

    • Increasing temperature
    • Decreasing temperature
    • Adding reactant
    • Removing product

  12. Product proportion falls as temperature rises in a reversible reaction. What is the forward reaction?

    • Catalysed
    • Neutral
    • Endothermic
    • Exothermic

  13. An endothermic equilibrium gives more products when which change is made?

    • Lowering the temperature
    • Raising the temperature
    • Stopping the reaction
    • Adding a catalyst only

  14. A reaction at equilibrium is cooled and the amount of products falls. What type of forward reaction is this?

    • Exothermic
    • Catalytic
    • Endothermic
    • Neutral

  15. Which type of equilibrium gives more product at a lower temperature?

    • Unbalanced
    • Exothermic
    • Endothermic
    • Neutral

  16. What happens to the relative amount of products when an exothermic equilibrium mixture is heated?

    • Decreases
    • Vanishes
    • Stays constant
    • Increases

  17. For an exothermic reaction with negative enthalpy change, which temperature maximises product yield?

    • Zero temperature
    • Infinite temperature
    • High temperature
    • Low temperature

  18. Why does changing temperature move an equilibrium position?

    • Rates change differently
    • Catalysts are destroyed
    • Rates stop completely
    • Pressure stays constant

  19. The forward reaction has a positive enthalpy change. What is the effect of a temperature rise?

    • Shifts to reactants
    • Shifts to products
    • No effect
    • Stops completely

  20. An exothermic equilibrium has 15% product at 500 °C. If the temperature is lowered to 300 °C, what would most likely happen to the percentage of product?

    • It stays at 15%
    • It becomes 100%
    • It falls below 15%
    • It rises above 15%

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