Required practical – Measure the rate of a reaction by an initial rate method, and a continuous monitoring method.

Last updated: 02/11/2022

AQA A-Level Chemistry Required practicals Required practical – Measure the rate of a reaction by an initial rate method, and a continuous monitoring method.

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Question 1 of 25

1. Question
When completing the ‘Iodine Clock’ experiment, which type of beaker should be used?
- 100 cm $^3$
- 200 cm $^3$
- 300 cm $^3$
- 400 cm $^3$
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Question 2 of 25

2. Question
What percentage of starch solution should be used during an ‘Iodine Clock’ experiment?
- 0.01
- 0.1
- 0.25
- 0.5
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Question 3 of 25

3. Question
When completing the ‘Iodine Clock’ experiment, which compound should the burette be filled with?
- Potassium iodide solution
- Hydrogen peroxide
- Iodine
- Iodine sulfate solution
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Question 4 of 25

4. Question
When completing the ‘Iodine Clock’ experiment, which compounds should the beaker be filled with?
- Hydrogen peroxide
- Potassium iodide solution
- Iodine
- Iodine sulfate solution
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Question 5 of 25

5. Question
When completing the ‘Iodine Clock’ experiment, which compound should the pipette be used for?
- Starch solution
- Potassium iodide solution
- Iodine sulfate solution
- Hydrogen peroxide
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Question 6 of 25

6. Question
When should the timer be stopped during an ‘Iodine Clock’ experiment?
- When there is a colour change to dark blue
- When all compounds have been used up
- After 15 minutes
- When there is a colour change to pale pink
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Question 7 of 25

7. Question
What should the beakers be rinsed with?
- Distilled water
- Starch solution
- Potassium iodide solution
- Sodium hydroxide
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Question 8 of 25

8. Question
How many times should the ‘Iodine Clock’ experiment be repeated?
- 4
- 3
- 2
- 1
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Question 9 of 25

9. Question
What type of experiment is the ‘Iodine Clock’?
- Titration
- Hydrolysis
- Precipitate
- Rate of reaction
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Question 10 of 25

10. Question
Which of the following is formed when hydrogen peroxide reacts with iodine ions?
- Iodine
- Hydrogen iodide
- Iodine sulfate
- Iodide peroxide
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Question 11 of 25

11. Question
At the end of the reaction between hydrogen peroxide and potassium iodide solution, which compound will be in excess?
- Iodine
- Distilled water
- Thiosulfate ions
- Sulfuric acid
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Question 12 of 25

12. Question
What can the ‘Iodine Clock’ experiment be used to find out?
- The effect of a change in the concentration of iodide ions.
- The effect of a change in the density of iodide ions.
- The effect of a change in the volume of iodide ions.
- The effect of a change in the mass of iodide ions.
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Question 13 of 25

13. Question
What type of ions are formed during the reaction between hydrogen peroxide and iodide ions?
- Thiosulfate
- Iodide
- Chlorine
- Hydroxide
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Question 14 of 25

14. Question
Which of the following is formed when hydrogen peroxide reacts with iodide ions?
- Thiosulfate ions
- Hydrogen sulfate
- Sulfate ions
- Sulfuric acid
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Question 15 of 25

15. Question
Which of the following ions are the reactants during the ‘Iodine Clock’ experiment?
- Iodide
- Thiosulfate
- Chlorine
- Hydroxide
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Question 16 of 25

16. Question
What colour solution is formed when hydrogen peroxide reacts with iodide ions?
- Dark blue
- Pale pink
- Yellow
- Red
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Question 17 of 25

17. Question
When completing the ‘Iodine Clock’ experiment, what concentration of sulfuric acid should be used?
- 0.25 mol dm $^{-3}$
- 0.10 mol dm $^{-3}$
- 0.05 mol dm $^{-3}$
- 0.01 mol dm $^{-3}$
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Question 18 of 25

18. Question
What can be determined when changing the concentration of iodide ions?
- The order of reaction
- The concentration of the solution
- The overall rate of reaction
- The time taken for the reaction to take place
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Question 19 of 25

19. Question
When completing the ‘Iodine Clock’ experiment, what concentration of potassium iodide solution should be used?
- 0.10 mol dm $^{-3}$
- 0.25 mol dm $^{-3}$
- 0.05 mol dm $^{-3}$
- 0.01 mol dm $^{-3}$
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Question 20 of 25

20. Question
When completing the ‘Iodine Clock’ experiment, which type of burette should be used?
- 50 cm $^3$
- 75 cm $^3$
- 25 cm $^3$
- 10 cm $^3$
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Question 21 of 25

21. Question
When completing the ‘Iodine Clock’ experiment, what concentration of sodium thiosulfate solution should be used?
- 0.05 mol dm $^{-3}$
- 0.10 mol dm $^{-3}$
- 0.25 mol dm $^{-3}$
- 0.01 mol dm $^{-3}$
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Question 22 of 25

22. Question
When completing the ‘Iodine Clock’ experiment, which type of measuring cylinder should be used?
- 25 cm $^3$
- 55 cm $^3$
- 75 cm $^3$
- 10 cm $^3$
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Question 23 of 25

23. Question
When completing the ‘Iodine Clock’ experiment, what concentration of hydrogen peroxide solution should be used?
- 0.10 mol dm $^{-3}$
- 0.05 mol dm $^{-3}$
- 0.25 mol dm $^{-3}$
- 0.01 mol dm $^{-3}$
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Question 24 of 25

24. Question
When completing the ‘Iodine Clock’ experiment, which type of pipette should be used?
- Plastic dropping
- Teat
- Glass granulated
- Plastic granulated
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Question 25 of 25

25. Question
When completing the ‘Iodine Clock’ experiment, how much starch should be used?
- 1 cm $^3$
- 2 cm $^3$
- 3 cm $^3$
- 4 cm $^3$
Correct

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