Lesson 5.5.1.2

5.5.1.2 Reaction profiles Quiz: AQA Combined Science, Unit 12

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.5.1.2, Reaction profiles: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 12: Energy changes, written with Revision Ninja.

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The 20 questions

  1. What is the minimum amount of energy particles must have to react, called?

    • Enthalpy change
    • Bond energy
    • Activation energy
    • Kinetic energy

  2. What is the minimum amount of energy particles must have to react called?

    • Kinetic energy
    • Thermal energy
    • Bond energy
    • Activation energy

  3. What is the minimum energy reacting particles must have to react?

    • Thermal energy
    • Kinetic energy
    • Activation energy
    • Bond energy

  4. What term describes a diagram showing reactant and product energies?

    • Plum pudding
    • Display formula
    • Reaction profile
    • Mass spectrum

  5. In an exothermic reaction profile, how do the products compare to the reactants?

    • Lower in energy
    • Higher in energy
    • Unrelated in energy
    • Equal in energy

  6. In an endothermic reaction profile, how do the products compare to the reactants?

    • Zero in energy
    • Higher in energy
    • Equal in energy
    • Lower in energy

  7. Reactants are at 50 kJ and products at 20 kJ. What is the energy change?

    • -30 kJ
    • -70 kJ
    • +30 kJ
    • +70 kJ

  8. On a reaction profile, the reactants are at 50 kJ and the peak is at 90 kJ. What is the activation energy?

    • 90 kJ
    • 50 kJ
    • 40 kJ
    • 140 kJ

  9. Reactants are at 40 kJ and products at 70 kJ. What is the overall energy change?

    • +30 kJ
    • -30 kJ
    • -110 kJ
    • +110 kJ

  10. How does the energy of products compare to reactants in an exothermic reaction?

    • Zero energy
    • More energy
    • Less energy
    • Equal energy

  11. On a reaction profile, activation energy is measured from which level?

    • Products level
    • Zero energy line
    • Reactants level
    • Peak height

  12. What determines the overall energy change of a chemical reaction?

    • Reactants and products
    • Particle speed
    • Activation energy
    • Collision frequency

  13. What do reacting particles need to overcome to start a reaction?

    • Magnetic force
    • Gravity barrier
    • Activation energy
    • Static friction

  14. What term describes the minimum energy needed for reacting particles to collide successfully?

    • Activation energy
    • Kinetic energy
    • Thermal energy
    • Bond energy

  15. Reaction X has activation energy 80 kJ and Y has 30 kJ. Which is higher?

    • Cannot be determined
    • Both are equal
    • Reaction X
    • Reaction Y

  16. Reactants are at 60 kJ and products are at 100 kJ. What is the overall energy change?

    • -40 kJ
    • +40 kJ
    • -160 kJ
    • +160 kJ

  17. What does a reaction profile show about product and reactant energy levels?

    • Energy change
    • Reaction rate
    • Collision frequency
    • Activation energy

  18. On a reaction profile, what name is given to the minimum energy needed for a reaction to start?

    • Overall change
    • Activation energy
    • Product energy
    • Reactant level

  19. What term describes the minimum energy reacting particles must possess to react?

    • Kinetic energy
    • Activation energy
    • Thermal energy
    • Bond energy

  20. A reaction profile shows reactants at 35 kJ and products at 35 kJ. What is the overall energy change?

    • 0 kJ
    • 35 kJ
    • 70 kJ
    • -35 kJ

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