Lesson 4.6.2.2

4.6.2.2 Energy changes and reversible reactions Quiz: AQA Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.6.2.2, Energy changes and reversible reactions: 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. If a reversible reaction is exothermic in one direction, what is it in the opposite direction?

    • Endothermic
    • Neutral
    • Catalysed
    • Exothermic

  2. A forward reaction releases 50 kJ. How much energy does the reverse reaction involve?

    • Absorbs 50 kJ
    • Absorbs 100 kJ
    • Releases 100 kJ
    • Releases 50 kJ

  3. Adding water to anhydrous copper sulfate to form hydrated copper sulfate is:

    • Catalysed
    • Neutral
    • Endothermic
    • Exothermic

  4. Which fundamental law explains why energy transferred is equal in both directions of a reversible reaction?

    • Le Chatelier principle
    • Energy conservation
    • Mass conservation
    • Avogadro law

  5. How do the energy transfers in opposite directions of a reversible reaction compare?

    • Doubled in reverse
    • Equal in size
    • Different sizes
    • Always zero

  6. What is true about the amount of energy transferred in each direction of a reversible reaction?

    • They are equal
    • Always zero
    • Reverse is larger
    • Forward is larger

  7. A forward reaction releases 60 kJ. What energy change is involved in the reverse reaction?

    • 120 kJ absorbed
    • 60 kJ absorbed
    • No energy change
    • 30 kJ absorbed

  8. Why is there no net energy gain over a complete cycle of a reversible reaction?

    • Heat is created
    • Reactions stop
    • Energy is lost
    • Energy is conserved

  9. Which thermal change occurs in the forward direction of a thermal decomposition?

    • Redox
    • Neutral
    • Exothermic
    • Endothermic

  10. A reversible reaction makes the mixture hotter in one direction. In the other direction, the mixture:

    • Stays the same
    • Explodes
    • Gets hotter
    • Cools

  11. What is the relationship between the energy changes of forward and reverse reactions?

    • Zero each
    • Unrelated
    • Always different
    • Equal and opposite

  12. A reaction absorbs 20 kJ in the forward direction. What does the reverse reaction do?

    • Releases 20 kJ
    • Releases 40 kJ
    • Absorbs 20 kJ
    • Absorbs 40 kJ

  13. What does a reversible reaction do to its surroundings when it proceeds endothermically?

    • Releases energy
    • Stops reacting
    • Absorbs energy
    • Creates matter

  14. Which process is exothermic in the forward direction?

    • Hydrating copper sulfate
    • Thermal decomposition
    • Melting ice
    • Dehydrating copper sulfate

  15. Which quantity is the same in both directions of a reversible reaction?

    • Reaction rate
    • Colour
    • Volume
    • Energy transferred

  16. On a reaction profile, the reverse of an exothermic reaction shows the products at a level that is:

    • Lower
    • Absent
    • Higher
    • The same

  17. If a reversible reaction is exothermic in one direction, what is it in the other?

    • Neutral
    • Catalysed
    • Exothermic
    • Endothermic

  18. How do the temperature changes of the surroundings compare in forward and reverse directions?

    • Always increasing
    • Opposite directions
    • Always identical
    • Always decreasing

  19. What type of energy change occurs when heating hydrated copper sulfate?

    • Exothermic
    • Neutralisation
    • Combustion
    • Endothermic

  20. If the forward reversible reaction is exothermic, what is the reverse reaction?

    • Endothermic
    • Catalytic
    • Exothermic
    • Thermal

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