Lesson 4.6.1.4

4.6.1.4 Catalysts Quiz: AQA Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.6.1.4, Catalysts: 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 a catalyst's mass during a chemical reaction?

    • Remains unchanged
    • Decreases
    • Halves
    • Increases

  2. How do catalysts increase the rate of a chemical reaction?

    • Add more particles
    • Lower activation energy
    • Raise temperature
    • Increase pressure

  3. Enzymes act as catalysts in which systems?

    • Industrial reactors only
    • Batteries
    • Electrolysis cells
    • Biological systems

  4. Where are catalysts omitted in relation to a chemical reaction?

    • Chemical equation
    • Rate graph
    • Energy profile
    • Practical method

  5. Different reactions need which kind of catalysts?

    • Different catalysts
    • Only enzymes
    • No catalysts
    • The same catalyst

  6. On a reaction profile for a catalysed reaction, how does the energy peak compare with the uncatalysed reaction?

    • Lower
    • Absent
    • Higher
    • The same

  7. Which kind of substance is tested as a catalyst for hydrogen peroxide decomposition in the specification?

    • Pure water
    • Metal salts
    • Non-metal gases
    • Alkalis only

  8. Which feature correctly identifies a substance as a catalyst?

    • Is used up
    • Speeds up reaction
    • Absorbs heat
    • Changes colour

  9. What remains completely unchanged on a reaction profile when using a catalyst?

    • Peak height
    • Reaction rate
    • Activation energy
    • Overall energy change

  10. What is the primary mechanism of action for a chemical catalyst?

    • Removing products
    • Consuming reactants
    • Lowering activation energy
    • Increasing temperature

  11. Enzymes are best described as:

    • Non-catalysts
    • Biological reactants
    • Biological catalysts
    • Biological solvents

  12. Which characteristic applies specifically to the action of catalysts?

    • Reaction specific
    • Works for all
    • Always enzymes
    • Always liquids

  13. What experimental evidence proves a substance acted as a catalyst?

    • Mass increased
    • Mass unchanged
    • Mass decreased
    • Volume doubled

  14. A catalyst added to a reaction halves the time taken. The rate has:

    • Stayed the same
    • Become zero
    • Doubled
    • Halved

  15. How does an enzyme lower activation energy to help body temperature reactions?

    • Pressure increases
    • Particles slow down
    • More particles react
    • Fewer particles react

  16. What happens to the mass of a catalyst by the end of a reaction?

    • Increases
    • Drops to zero
    • Stays the same
    • Decreases

  17. Why does a catalyst not change the overall energy change of a reaction?

    • Removes products
    • Different pathway used
    • Increases pressure
    • Changes temperature

  18. Which feature of a reaction profile is lowered by adding a catalyst?

    • Activation energy
    • Enthalpy change
    • Reactant energy
    • Product energy

  19. What is the primary function of a catalyst in a chemical reaction?

    • Speeds up reaction
    • Consumes reactants
    • Changes enthalpy
    • Increases yield

  20. What are two key benefits of using catalysts in industrial chemical processes?

    • Higher toxicity
    • More waste
    • Faster and cheaper
    • Lower yields

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