Lesson 4.6.1.3

4.6.1.3 Collision theory and activation energy Quiz: AQA Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.6.1.3, Collision theory and activation energy: 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 is the minimum energy particles must have to react called?

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

  2. Which term describes the minimum energy particles must have to react?

    • Activation energy
    • Bond energy
    • Ionisation energy
    • Enthalpy

  3. Increasing the concentration of a solution does what to the frequency of collisions?

    • Makes it zero
    • Has no effect
    • Increases it
    • Decreases it

  4. Increasing the pressure of a reacting gas does what to collision frequency?

    • Has no effect
    • Increases it
    • Decreases it
    • Stops collisions

  5. Increasing the surface area of a solid reactant does what to collisions with the solid?

    • Decreases their frequency
    • Increases their frequency
    • Stops them
    • Has no effect

  6. What happens to reacting particles when the temperature is increased?

    • More exceed activation energy
    • Activation energy increases
    • Fewer exceed activation energy
    • Activation energy decreases

  7. Doubling the concentration of a reactant, with other factors constant, roughly does what to the rate?

    • Stops the reaction
    • Leaves it unchanged
    • Roughly doubles it
    • Halves it

  8. Why does powdered marble react faster than marble lumps?

    • Higher surface area ratio
    • Greater reactant concentration
    • Higher activation energy
    • Lower surface area ratio

  9. Two solids of equal mass are reacted with acid, one in lumps and one as powder. Which reacts faster?

    • The powder
    • Both equally
    • Neither
    • The lumps

  10. Why is a reaction slow at a low temperature like 25 degrees Celsius?

    • Higher particle speed
    • More frequent collisions
    • Lower activation energy
    • Fewer energetic collisions

  11. What term describes a collision that successfully results in a reaction?

    • Elastic collision
    • Sufficient energy collision
    • Low energy collision
    • Slow collision

  12. Which factor increases the proportion of particles with energy at or above the activation energy?

    • Surface area
    • Pressure
    • Concentration
    • Temperature

  13. How does increasing temperature affect the activation energy of a chemical reaction?

    • No effect
    • Doubles it
    • Increases it
    • Decreases it

  14. Why does increasing reactant concentration increase the rate of reaction?

    • Larger surface area
    • More frequent collisions
    • Higher temperature
    • Lower activation energy

  15. What happens to gas particle collisions when pressure is increased?

    • Frequency decreases
    • Frequency increases
    • Energy decreases
    • Speed decreases

  16. What two effects does increasing temperature have on particle collisions?

    • More frequent and energetic
    • More frequent and slower
    • Fewer and less energetic
    • Less frequent and energetic

  17. If the surface area of a solid reactant is decreased, what happens to the rate?

    • Doubles
    • No effect
    • Decreases
    • Increases

  18. In simple proportional reasoning, doubling the reactant concentration does what to the rate?

    • Has no effect
    • Squares the rate
    • Halves the rate
    • Doubles the rate

  19. Why do collisions with energy below the activation energy fail to react?

    • Too concentrated
    • Insufficient energy
    • Wrong orientation
    • Too slow

  20. Which factor means more particles per unit volume?

    • Surface area
    • Pressure
    • Temperature
    • Concentration

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