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Rates of reaction

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-5 · England: KS4 Combined Science: The rate and extent of chemical change

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  1. Question 1

    Rates of reaction: which statement is NOT true?

    • A. Increasing surface area increases the rate.
    • B. Every collision between particles causes a reaction.
    • C. Reactions need particles to collide with enough energy.
    • D. A catalyst is not used up in a reaction.

  2. Question 2

    Why does powdered marble react faster with acid than marble chips?

    • A. Powder has more mass
    • B. Chips are hotter
    • C. Powder is a different substance
    • D. Powder has a larger surface area, so there are more collisions

  3. Question 3

    A reaction produces 50 cm³ of gas in 50 seconds. What is the mean rate of reaction, in cm³/s?

    Answercm³/s

  4. Question 4

    Rates of reaction: which statement is NOT true?

    • A. Lower temperatures make reactions faster.
    • B. Food lasts longer in a fridge because reactions are slower at low temperature.
    • C. Reactions need particles to collide with enough energy.
    • D. Increasing surface area increases the rate.

  5. Question 5

    Why does powdered marble react faster with acid than marble chips?

    • A. Chips are hotter
    • B. Powder is a different substance
    • C. Powder has a larger surface area, so there are more collisions
    • D. Powder has more mass

  6. Question 6

    A reaction produces 25 cm³ of gas in 50 seconds. What is the mean rate of reaction, in cm³/s?

    Answercm³/s

  7. Question 7

    Rates of reaction: which statement is NOT true?

    • A. Every collision between particles causes a reaction.
    • B. Reactions need particles to collide with enough energy.
    • C. A catalyst is not used up in a reaction.
    • D. Food lasts longer in a fridge because reactions are slower at low temperature.

  8. Question 8

    What does a catalyst do?

    • A. is used up in the reaction
    • B. speeds up a reaction without being used up
    • C. slows down a reaction
    • D. changes the products

  9. Question 9

    A reaction produces 60 cm³ of gas in 40 seconds. What is the mean rate of reaction, in cm³/s?

    Answercm³/s

  10. Question 10

    Rates of reaction: which statement is NOT true?

    • A. A catalyst is not used up in a reaction.
    • B. Increasing surface area increases the rate.
    • C. Reactions need particles to collide with enough energy.
    • D. A catalyst increases the amount of product made.

  11. Question 11

    Why does increasing the temperature speed up a reaction?

    • A. Particles move faster, collide more often and more collisions have enough energy
    • B. It adds more particles
    • C. Particles get bigger
    • D. It lowers the activation energy

  12. Question 12

    A reaction produces 30 cm³ of gas in 60 seconds. What is the mean rate of reaction, in cm³/s?

    Answercm³/s

  13. Question 13

    Rates of reaction: which statement is NOT true?

    • A. Reactions need particles to collide with enough energy.
    • B. Increasing surface area increases the rate.
    • C. Every collision between particles causes a reaction.
    • D. Food lasts longer in a fridge because reactions are slower at low temperature.

  14. Question 14

    Why does powdered marble react faster with acid than marble chips?

    • A. Powder has more mass
    • B. Powder has a larger surface area, so there are more collisions
    • C. Chips are hotter
    • D. Powder is a different substance

  15. Question 15

    A reaction produces 90 cm³ of gas in 30 seconds. What is the mean rate of reaction, in cm³/s?

    Answercm³/s

  16. Question 16

    Rates of reaction: which statement is NOT true?

    • A. A catalyst increases the amount of product made.
    • B. Reactions need particles to collide with enough energy.
    • C. Increasing surface area increases the rate.
    • D. A catalyst is not used up in a reaction.

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  1. Every collision between particles causes a reaction.
  2. Powder has a larger surface area, so there are more collisions
  3. 1 cm³/s
  4. Lower temperatures make reactions faster.
  5. Powder has a larger surface area, so there are more collisions
  6. 0.5 cm³/s
  7. Every collision between particles causes a reaction.
  8. speeds up a reaction without being used up
  9. 1.5 cm³/s
  10. A catalyst increases the amount of product made.
  11. Particles move faster, collide more often and more collisions have enough energy
  12. 0.5 cm³/s
  13. Every collision between particles causes a reaction.
  14. Powder has a larger surface area, so there are more collisions
  15. 3 cm³/s
  16. A catalyst increases the amount of product made.