16.1.1 Rate equations and orders of reaction Quiz: Pearson Edexcel Chemistry, Unit 16

The 20 questions

1. What is the standard SI unit for the rate of a chemical reaction?

   • mol dm-3
   • s-1
   • mol dm-3 s-1
   • mol s-1

2. Which equation links reaction rate directly to reactant concentrations?

   • Enthalpy equation
   • Arrhenius equation
   • Equilibrium expression
   • Rate equation

3. What does the power of a concentration term in a rate equation represent?

   • Order of reaction
   • Stoichiometry
   • Activation energy
   • Rate constant

4. For the rate equation rate = k[A][B]^2, what is the overall order of reaction?

   • 1
   • 3
   • 2
   • 4

5. Which factor directly alters the value of the rate constant k?

   • Temperature
   • Pressure
   • Reactant concentration
   • Reaction volume

6. What term describes the time taken for a reactant concentration to halve?

   • Time constant
   • Half-life
   • Reaction rate
   • Period of decay

7. What name is given to the slowest step in a reaction mechanism?

   • Initiation step
   • Propagation step
   • Rate-determining step
   • Fast step

8. For rate = k[A]^2, by what factor does rate change if [A] is doubled?

   • Remains constant
   • Increases by 8
   • Increases by 4
   • Increases by 2

9. For rate = k[A][B], what happens to rate if [A] triples and [B] halves?

   • Multiplied by 3
   • Multiplied by 0.5
   • Multiplied by 1.5
   • Multiplied by 6

10. A reaction is zero order with respect to reactant X. What happens to rate if [X] doubles?

    • Remains unchanged
    • Doubles
    • Quadruples
    • Halves

11. Initial-rate data show that doubling [A] from 0.10 to 0.20 mol dm-3 increases the rate fourfold. What is the order with respect to A?

    • 1
    • 2
    • 3
    • 0

12. A first-order reaction has a half-life of 20 s. What fraction of the reactant remains after 60 s?

    • 6.25%
    • 12.5%
    • 33%
    • 25%

13. For rate = k[A]^2, the rate is 4.0 x 10^-4 mol dm-3 s-1 when [A] = 0.20 mol dm-3. What is k?

    • 100 dm3 mol-1 s-1
    • 0.0020 dm3 mol-1 s-1
    • 0.0016 dm3 mol-1 s-1
    • 0.0100 dm3 mol-1 s-1

14. What are the units of k for a reaction that is first order in A and first order in B?

    • mol dm-3 s-1
    • dm3 mol-1 s-1
    • mol2 dm-6 s-1
    • s-1

15. For rate = k[NO]^2[H2], which species are involved in the rate-determining step?

    • 1 NO, 1 H2
    • 2 NO, 2 H2
    • 1 NO, 2 H2
    • 2 NO, 1 H2

16. What is the rate constant for a first-order reaction with a half-life of 20 s?

    • 0.0100 s-1
    • 20 s-1
    • 0.0347 s-1
    • 0.693 s-1

17. Three experiments show that doubling [A] doubles the rate, and tripling [B] increases the rate ninefold. What is the overall order?

    • 4
    • 1
    • 2
    • 3

18. How are the orders of reaction in a rate equation determined?

    • Experimentally
    • From structural formulas
    • From stoichiometry
    • From balanced equations

19. Which apparatus measures the rate of a reaction producing a gas?

    • Gas syringe
    • Burette
    • Pipette
    • Thermometer

20. Which two factors can change the value of the rate constant k?

    • Concentration and pressure
    • Temperature and catalyst
    • Pressure and volume
    • Concentration and surface area

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