Lesson 3.1.9.2

3.1.9.2 Determination of rate equation Quiz: AQA Chemistry, Unit 1

20 questions

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Lesson 3.1.9.2, Determination of rate equation: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.

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The 20 questions

  1. How is the rate at a specific time determined from a concentration–time graph?

    • Secant gradient
    • Area under curve
    • Y-intercept value
    • Tangent gradient

  2. Why are initial concentrations used when determining initial reaction rates?

    • Volume is constant
    • Catalyst is present
    • Known accurately
    • Rate is zero

  3. In a rate experiment, doubling [A] doubles the initial rate. What is the order with respect to A?

    • 0
    • 1
    • 3
    • 2

  4. In a rate experiment, doubling [A] quadruples the initial rate. What is the order with respect to A?

    • 2
    • 4
    • 1
    • 0

  5. In a rate experiment, doubling [A] has no effect on the initial rate. What is the order with respect to A?

    • 0
    • 1
    • 2
    • -1

  6. Experiment 1 and Experiment 2 differ only in [B]: [B] doubles and the rate increases four times. What is the order with respect to B?

    • 4
    • 2
    • 1
    • 0

  7. Rate data show that tripling [B] at constant [A] increases the rate by a factor of 9. What is the order with respect to B?

    • 2
    • 1
    • 9
    • 3

  8. Rate data show that doubling [A] doubles the rate and doubling [B] has no effect. What is the rate equation?

    • Rate = k[B]
    • Rate = k[A]^2
    • Rate = k[A][B]
    • Rate = k[A]

  9. For Rate = k[NO]²[H₂], what species are present in the rate-determining step?

    • Two NO, one H₂
    • Two NO, two H₂
    • One NO, two H₂
    • One NO, one H₂

  10. What shape is a concentration–time graph for a zero-order reaction?

    • Horizontal line
    • Straight line down
    • Exponential curve down
    • Straight line up

  11. A concentration-time graph for a zero-order reaction has a gradient of -0.020 mol dm^-3 s^-1. What is the rate constant k?

    • 0.020 mol dm^-3 s^-1
    • 0.0004 mol dm^-3 s^-1
    • 0.020 s^-1
    • 50 mol dm^-3 s^-1

  12. In clock reactions, how is initial rate related to the time taken, t, for a fixed product amount?

    • Proportional to 1/t
    • Proportional to 1/t^2
    • Proportional to t^2
    • Proportional to t

  13. Which method measures gas volume or mass loss continually throughout a reaction?

    • Quenching titration
    • Continuous monitoring
    • Clock reaction method
    • Initial rate method

  14. What parameter is varied between experiments in the initial rate method?

    • Reaction temperature
    • Initial reactant concentration
    • Catalyst surface area
    • Reaction pressure

  15. A tangent drawn to a concentration-time curve has a gradient of -0.0050 mol dm^-3 s^-1 at a given time. What is the rate of reaction at that time?

    • 0.0050 s^-1
    • -0.0050 mol dm^-3 s^-1
    • 0.0050 mol dm^-3 s^-1
    • 200 mol dm^-3 s^-1

  16. If doubling [B] has no effect on rate, what happens to rate when [B] is halved?

    • Remains unchanged
    • Doubles
    • Halves
    • Quarters

  17. What order is a reaction if concentration decreases by 0.10 mol dm^-3 every 10 seconds?

    • Third order
    • First order
    • Second order
    • Zero order

  18. A rate experiment shows that doubling [A] and tripling [B] at constant temperature increases the rate by a factor of 18. What is the rate equation?

    • Rate = k[A][B]
    • Rate = k[A]^2[B]
    • Rate = k[A][B]^2
    • Rate = k[A]^2[B]^2

  19. Which experimental method determines reaction orders by measuring the rate right at the start?

    • Distillation method
    • Continuous monitoring method
    • Initial rate method
    • Quenching method

  20. A reaction is second order for A. By what factor does rate increase if [A] is doubled?

    • Factor of 8
    • Factor of 2
    • Factor of 4
    • Factor of 16

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