Lesson 4.5.1.2

4.5.1.2 Reaction profiles Quiz: AQA Chemistry, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.5.1.2, Reaction profiles: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 5: Energy changes, written with Revision Ninja.

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The 20 questions

  1. What is the minimum energy required for reacting particles to react called?

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

  2. On a reaction profile, what does the vertical distance between reactants and products represent?

    • Collision frequency
    • Peak energy
    • Overall energy change
    • Activation energy

  3. On an exothermic reaction profile, where are the products positioned relative to reactants?

    • Higher
    • Lower
    • Equal
    • At the peak

  4. Which feature on a reaction profile represents the energy needed to start the reaction?

    • Product level
    • Overall change line
    • Activation energy peak
    • Reactant trough

  5. What type of line is used on a reaction profile to show energy changes?

    • Straight line
    • Horizontal dashed line
    • Curved line
    • Step function line

  6. A reaction profile shows reactants at a higher level than products. What type of reaction is it?

    • Catalysed only
    • Neutral
    • Exothermic
    • Endothermic

  7. How is activation energy measured on a reaction profile?

    • Zero to products
    • Peak above reactants
    • Peak to products
    • Reactants to products

  8. Why are products positioned lower than reactants on an exothermic reaction profile?

    • Bonds fail to form
    • Energy is released
    • Temperature decreases
    • Activation energy is high

  9. Besides a collision, what property must reacting particles possess to react?

    • Maximum speed
    • Catalytic mass
    • Sufficient energy
    • Neutral charge

  10. On a reaction profile, what is the horizontal axis usually labelled?

    • Progress of reaction
    • Mass of product
    • Volume of gas
    • Temperature only

  11. What three features can be identified from a reaction profile?

    • Mass, density, temperature
    • Rate, yield, catalyst
    • Energies, activation, overall
    • Volume, pressure, moles

  12. A reaction has a very high activation energy. What does this indicate?

    • Instantaneous explosion
    • Endothermic process
    • Slow reaction rate
    • Fast reaction rate

  13. What does a lower product line on a reaction profile indicate?

    • Catalyst added
    • Activation energy
    • Energy released
    • Energy absorbed

  14. What does the peak of a reaction profile represent?

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

  15. Do exothermic reactions require activation energy?

    • Only with catalysts
    • Only if heated
    • No, never
    • Yes, always

  16. In an exothermic reaction profile, where are the products positioned?

    • Above the peak
    • Lower than reactants
    • Equal to reactants
    • Higher than reactants

  17. Why is a curved line used on a reaction profile?

    • To show volume
    • To show progress
    • To show pressure
    • To show catalysts

  18. Why is the energy change represented by a smooth curve?

    • Energy changes continuously
    • Energy drops instantly
    • Energy stays constant
    • Energy stops midway

  19. Which feature indicates a very slow reaction with difficult particle collisions?

    • Exothermic change
    • Endothermic change
    • High activation energy
    • Low activation energy

  20. On a reaction profile, what is the vertical distance between reactant and product levels?

    • Overall energy change
    • Peak energy
    • Activation energy
    • Bond energy

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