Lesson 5.6.1.4

5.6.1.4 Catalysts Quiz: AQA Combined Science, Unit 13

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.6.1.4, Catalysts: 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 substance that changes reaction rate without being used up?

    • Product
    • Inhibitor
    • Catalyst
    • Reactant

  2. Which biological molecules act as catalysts in living systems?

    • Lipids
    • Minerals
    • Vitamins
    • Enzymes

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

    • Increased pressure
    • Greater concentration
    • Higher temperature
    • Lower activation energy

  4. How can a catalyst be identified in a reaction?

    • Consumed completely
    • Not in equation
    • Always a gas
    • Always a protein

  5. Which statement about catalysts and chemical reactions is correct?

    • Always metal salts
    • Always biological
    • Specific to reactions
    • Universal for all

  6. Which substance is commonly decomposed to investigate catalysts using metal salts?

    • Hydrogen peroxide
    • Hydrochloric acid
    • Sodium chloride
    • Calcium carbonate

  7. In a catalysed reaction profile compared with an uncatalysed one, the overall energy change is:

    • Larger
    • Smaller
    • Unchanged
    • Reversed

  8. Why is a catalyst not included in a balanced chemical equation?

    • It slows reactions down
    • It dissolves completely
    • Neither consumed nor produced
    • It is a gas

  9. A metal salt added to hydrogen peroxide increases the rate of gas production without being used up. The salt is acting as:

    • A catalyst
    • An inhibitor
    • A product
    • A reactant

  10. A catalyst lowers activation energy from 90 kJ/mol to 60 kJ/mol. What is the reduction?

    • 90 kJ/mol
    • 60 kJ/mol
    • 150 kJ/mol
    • 30 kJ/mol

  11. If exactly 2 g of a catalyst is added to a reaction mixture, what is its mass afterwards?

    • More than 2 g
    • 0 g
    • 1 g
    • 2 g

  12. Compared to an uncatalysed reaction, what is lower in a catalysed reaction pathway?

    • Reactant mass
    • Product yield
    • Enthalpy change
    • Activation energy

  13. Why does adding a catalyst make a reaction go faster at the same temperature?

    • More successful collisions
    • Increased gas pressure
    • Greater reactant volume
    • Higher particle speed

  14. Which of the following is NOT a property of a true chemical catalyst?

    • Lowers activation energy
    • Speeds up reactions
    • Included in equations
    • Not used up

  15. What is the scientific term for biological catalysts found in living organisms?

    • Antibodies
    • Enzymes
    • Hormones
    • Nutrients

  16. Which physical property of a solid catalyst is often increased in industrial processes?

    • Mass
    • Density
    • Melting point
    • Surface area

  17. What happens to the overall energy change when a catalyst is used?

    • Stays the same
    • Increases
    • Decreases
    • Becomes zero

  18. What happens to a catalyst during a chemical reaction?

    • Remains unchanged
    • Gets used up
    • Forms a precipitate
    • Increases in mass

  19. What does a steeper initial rate curve indicate about a reaction?

    • Lower activation energy
    • Faster initial rate
    • Higher final yield
    • Greater temperature

  20. What is the primary economic benefit of using catalysts in industry?

    • Lower energy costs
    • Safer storage
    • Higher product purity
    • Less equipment wear

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