3.1.5.3 Effect of temperature on reaction rate Quiz: AQA Chemistry, Unit 1

The 20 questions

1. What qualitative effect does raising the temperature have on the rate of a chemical reaction?

   • No effect
   • Increases it
   • Decreases it
   • Halves it

2. What is the main reason raising temperature increases the rate of a chemical reaction?

   • Lower activation energy
   • Smaller particles
   • Increased pressure
   • More successful collisions

3. As a rough rule of thumb, how does reaction rate change for a 10 K temperature rise?

   • It doubles
   • It triples
   • It quadruples
   • It stays constant

4. In the sodium thiosulfate rate experiment, how is initial rate calculated from time t?

   • t squared
   • t
   • log(t)
   • 1 / t

5. When investigating how temperature affects reaction rate, which variable must be kept constant?

   • Reactant concentration
   • Reaction temperature
   • Precipitate mass
   • Reaction time

6. In the sodium thiosulfate and acid reaction, what is the independent variable when investigating temperature?

   • Acid concentration
   • Solution temperature
   • Cross size
   • Precipitate mass

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

   • Increases
   • Halves
   • Decreases
   • Unchanged

8. A reaction has a rate of 1.0 at 20 C and roughly doubles for every 10 K. What is the rate at 30 C?

   • 10
   • 0.5
   • 1.0
   • 2.0

9. Using the same rule, what is the rate at 40 C if the rate is 1.0 at 20 C?

   • 8.0
   • 4.0
   • 1.5
   • 2.0

10. A cross disappears in 40 s at 20 °C. If the rate doubles at 30 °C, what is the new time?

    • 20 s
    • 10 s
    • 80 s
    • 30 s

11. If reaction time decreases from 80 s to 20 s, by what factor does rate increase?

    • Factor of 4
    • Factor of 1/4
    • Factor of 2
    • Factor of 6

12. A reaction rate is 0.020 mol dm-3 s-1 at 25 C and 0.040 mol dm-3 s-1 at 35 C. What is the approximate factor increase per 10 K?

    • About 2
    • About 4
    • About 0.5
    • No change

13. Why is a water bath used in initial rate experiments investigating temperature?

    • Speed up reaction
    • Change concentration
    • Increase activation energy
    • Control temperature

14. How does increasing temperature affect the fraction of molecules with energy above activation energy?

    • Increases linearly
    • Increases exponentially
    • Remains constant
    • Decreases linearly

15. Which apparatus is commonly used to measure the volume of gas produced in a rate experiment?

    • A thermometer only
    • A burette only
    • A pipette only
    • A gas syringe

16. Why does a small temperature increase cause a large increase in reaction rate?

    • Higher particle mass
    • More energetic particles
    • Lower activation energy
    • Increased particle volume

17. At higher temperatures, why do reactions proceed at a faster rate?

    • Lower activation energy
    • Larger reactant mass
    • More successful collisions
    • Fewer total collisions

18. A reaction takes 60 s at 25 °C and 15 s at 45 °C. How do the rates compare?

    • 15 times faster
    • 2 times faster
    • 4 times faster
    • 4 times slower

19. In an experiment, the rate at 300 K is 0.010 and at 310 K is 0.020. What is the ratio of rates for each 10 K rise?

    • 0.5
    • 1
    • 10
    • 2

20. What must be kept constant when investigating the effect of temperature on rate?

    • Reactant concentrations
    • Reaction temperature
    • Gas pressure only
    • Activation energy

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