Lesson 11.1.2

11.1.2 Temperature, pressure, catalysts and equilibrium Quiz: Pearson Edexcel Chemistry, Unit 11

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 11.1.2, Temperature, pressure, catalysts and equilibrium: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 11: Equilibrium II, written with Revision Ninja.

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The 20 questions

  1. How does an increase in temperature affect Kc for an exothermic reaction?

    • Decreases
    • Stays the same
    • Increases
    • Doubles

  2. How does a temperature rise affect the value of Kc for an endothermic reaction?

    • Increases
    • Becomes zero
    • Remains unchanged
    • Decreases

  3. Which change to a gaseous system at equilibrium alters the value of Kp?

    • Adding a catalyst
    • Increasing total pressure
    • Adding reactants
    • Increasing temperature

  4. For an exothermic gaseous reaction, how does raising temperature affect Kp?

    • Kp increases
    • Kp decreases
    • Kp becomes zero
    • Kp stays constant

  5. Why does a catalyst not alter the position of equilibrium?

    • Increases rates equally
    • Favours forward reaction
    • Lowers reverse rate
    • Increases Kp value

  6. Which change increases the equilibrium yield of ammonia in: N2(g) + 3H2(g) ⇌ 2NH3(g)?

    • Decreasing total pressure
    • Increasing temperature
    • Adding a catalyst
    • Increasing total pressure

  7. Why is a compromise temperature used rather than a low temperature in the Haber process?

    • To increase yield
    • To shift equilibrium
    • To lower pressure
    • To increase rate

  8. Why is an iron catalyst used in the industrial Haber process?

    • Increases ammonia yield
    • Reduces total pressure
    • Increases equilibrium constant
    • Increases reaction rate

  9. An equilibrium has 2 gas moles on the left and 4 on the right. Increasing pressure shifts it:

    • Shifts to right
    • Shifts to left
    • No change
    • Fully to right

  10. Which change shifts the position of equilibrium to the right for N2O4(g) ⇌ 2NO2(g)?

    • Decreasing temperature
    • Adding a catalyst
    • Decreasing total pressure
    • Increasing total pressure

  11. What happens to the product yield of an exothermic reaction if temperature is increased?

    • Increases then decreases
    • It increases
    • Remains unchanged
    • It decreases

  12. What compromise is typically made between yield and rate for an exothermic industrial reaction?

    • Moderate temperature
    • Lowest possible temperature
    • Highest possible temperature
    • Lowest possible pressure

  13. Why are very high pressures financially disadvantageous in industrial chemical processes?

    • Lower product yield
    • Catalyst poisoning
    • Slower reaction rates
    • High energy costs

  14. For an exothermic reaction at equilibrium, how does decreasing temperature affect the value of Kp?

    • No effect
    • Decreases Kp
    • Halves Kp
    • Increases Kp

  15. How does increasing pressure affect an equilibrium with equal gas moles on both sides?

    • Shifts to left
    • No effect
    • Increases Kp
    • Shifts to right

  16. Which factor is the ONLY one that alters the value of an equilibrium constant Kp?

    • Concentration
    • Catalyst
    • Pressure
    • Temperature

  17. Which conditions maximise equilibrium yield for an exothermic reaction with fewer product moles?

    • High pressure, low temperature
    • High pressure, high temperature
    • Low pressure, high temperature
    • Low pressure, low temperature

  18. According to Le Chatelier's principle, how does an equilibrium system respond to a change?

    • Amplifies the change
    • Prevents all reaction
    • Favours endothermic side
    • Opposes the change

  19. Why does adding an inert gas at constant volume not shift a gaseous equilibrium?

    • Total pressure unchanged
    • Partial pressures unchanged
    • Temperature decreases
    • Equilibrium constant increases

  20. What happens to the equilibrium constant, Kc, for an exothermic reaction as temperature increases?

    • It decreases
    • It stays constant
    • It increases
    • It reaches zero

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