Lesson 5.6.2.1

5.6.2.1 Reversible reactions Quiz: AQA Combined Science, Unit 13

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.6.2.1, Reversible reactions: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 13: The rate and extent of chemical change, written with Revision Ninja.

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The 20 questions

  1. What term describes a reaction where products can turn back into reactants?

    • Reversible reaction
    • Thermal decomposition
    • Displacement reaction
    • Irreversible reaction

  2. What symbol is used in chemical equations to represent a reversible reaction?

    • Double arrow
    • Equals sign
    • Single arrow
    • Plus sign

  3. How can the direction of a reversible reaction be altered?

    • Stirring faster
    • Adding a reactant
    • Increasing volume
    • Changing conditions

  4. In A + B to C + D (reversible), which substances start the reverse reaction?

    • A and B
    • C and D
    • A and C
    • B and D

  5. Which process occurs in both directions during a reversible reaction?

    • Only forward
    • Only backward
    • Neutralisation
    • Forward and backward

  6. Adding water to anhydrous copper(II) sulfate to form hydrated copper(II) sulfate is an example of:

    • A displacement reaction
    • A neutralisation reaction
    • An irreversible decomposition
    • A reversible reaction

  7. Which chemical equation type represents the synthesis of ammonia?

    • Precipitation equation
    • Reversible equation
    • Thermal equation
    • Balanced ionic

  8. Which type of reaction is generally considered irreversible under normal conditions?

    • Esterification
    • Burning magnesium
    • Hydrating copper sulfate
    • Heating ammonium chloride

  9. The reverse of the reaction A to B is:

    • B to B
    • B to A
    • A + B to AB
    • A to A

  10. Heating ammonium chloride forms ammonia and hydrogen chloride, which recombine on cooling. This shows:

    • A reversible reaction
    • A combustion reaction
    • An electrolysis reaction
    • A precipitation reaction

  11. In what type of apparatus does a reversible reaction reach dynamic equilibrium?

    • Open beaker
    • Closed system
    • Vacuum chamber
    • Combustion tube

  12. Why can the direction of a reversible reaction be reversed?

    • Products reform reactants
    • Pressure drops
    • Catalysts are added
    • Energy is destroyed

  13. In the reversible formation of ethyl ethanoate, what are the products?

    • Ethanol and ethanoic acid
    • Ethanol and water
    • Ethyl ethanoate and water
    • Ethyl ethanoate and acid

  14. What must occur for a reversible reaction to reach equilibrium?

    • Only forward reaction happens
    • Reaction stops completely
    • Reactants are removed
    • Reverse reaction happens

  15. In a reversible reaction written as A + B right_arrow C + D, what can products C and D do?

    • Turn into a gas
    • Destroy the catalyst
    • React to form A and B
    • Increase the temperature

  16. What type of apparatus must be used to study chemical equilibrium in a reversible reaction?

    • Evaporating basin
    • Open beaker
    • Vented test tube
    • Closed apparatus

  17. For 2NO2 to N2O4, what are the reactants of the reverse reaction?

    • NO only
    • N2 and O2
    • N2O4
    • NO2

  18. What is the reverse reaction of CaCO3 right_arrow CaO + CO2?

    • CaO + CaCO3 right_arrow CO2
    • CaCO3 + CaO right_arrow CO2
    • CO2 + CaCO3 right_arrow CaO
    • CaO + CO2 right_arrow CaCO3

  19. In the reaction H2 + I2 to 2HI, how many total molecules are on the reactant side?

    • Four molecules
    • One molecule
    • Three molecules
    • Two molecules

  20. Which everyday physical process is used as an analogy for a reversible reaction?

    • Burning wood
    • Cooking an egg
    • Rusting iron
    • Melting and freezing

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