PAG 10.1 – Rates – iodine clock

Last updated: 11/03/2020

OCR-A A-Level Chemistry Rates of reaction PAG 10.1 – Rates – iodine clock

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Question 1 of 28

1. Question
When carrying out an iodine clock test, how much potassium iodide should be used?
- 5 cm $^3$
- 2 cm $^3$
- 3 cm $^3$
- 4 cm $^3$
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Question 2 of 28

2. Question
When carrying out an iodine clock test, how much sodium thiosulfate should be used?
- 2 cm $^3$
- 1 cm $^3$
- 3 cm $^3$
- 4 cm $^3$
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Question 3 of 28

3. Question
When carrying out an iodine clock test, how much starch should be used?
- 1 cm $^3$
- 2 cm $^3$
- 3 cm $^3$
- 4 cm $^3$
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Question 4 of 28

4. Question
When carrying out an iodine clock test, how much potassium peroxodisulfate should be used?
- 2 cm $^3$
- 1 cm $^3$
- 3 cm $^3$
- 4 cm $^3$
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Question 5 of 28

5. Question
When carrying out an iodine clock test, which of the following should be used?
- Potassium iodide
- Bromine water
- Sodium sulfate
- Iodine
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Question 6 of 28

6. Question
When carrying out an iodine clock test, which of the following should be used?
- Sodium thiosulfate
- Phosphoric acid
- Potassium dichromate
- Ethanol
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Question 7 of 28

7. Question
When carrying out an iodine clock test, which of the following should be used?
- Potassium peroxodisulfate
- Iodine solution
- Thionyl chloride
- Potassium bromide
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Question 8 of 28

8. Question
When carrying out an iodine clock test, which of the following should be used?
- Starch
- Hydrochloric acid
- Sodium hydroxide
- Phenol
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Question 9 of 28

9. Question
When carrying out an iodine clock test, what type of flask should be used?
- Conical flask
- Round-bottomed flask
- Separating flask
- Volumetric flask
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Question 10 of 28

10. Question
When carrying out an iodine clock test, what colour should the solution turn before you stop the stop clock?
- Dark blue
- Pale pink
- Dark green
- Yellow
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Question 11 of 28

11. Question
When repeating the iodine clock test which of the following compounds should the concentration be varied for?
- Potassium iodide
- Starch
- Sodium thiosulfate
- Potassium peroxosulfate
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Question 12 of 28

12. Question
How many different types of chemicals are used within the iodine clock test?
- 4
- 3
- 2
- 1
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Question 13 of 28

13. Question
When carrying out an iodine clock test, which three compounds should be mixed together initially?
- Potassium iodide, sodium thiosulfate and starch
- Potassium iodide, potassium peroxodisulfate and sodium thiosulfate
- Starch, sodium thiosulfate and potassium peroxodisulfate
- Potassium peroxodisulfate, potassium iodide and starch
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Question 14 of 28

14. Question
How many columns should the table set up to show the results of an iodine clock test have?
- 8
- 6
- 4
- 2
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Question 15 of 28

15. Question
Which of the following concentrations are trying to be calculated during the iodine clock test?
- Iodide ions
- Hydroxide ions
- Chloride ions
- Bromide ions
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Question 16 of 28

16. Question
Which of the following is the correct formula used to work out the concentration of iodide ions?
- volume of potassium iodide / 10
- volume of potassium iodide / 5
- 10 / volume of potassium iodide
- 5 / volume of potassium iodide
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Question 17 of 28

17. Question
What should be calculated during the iodine clock test?
- Initial rate
- Acidity
- pH
- Volume
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Question 18 of 28

18. Question
Which of the following is the correct formula used to work out the initial rate of reaction?
- $2 x 10^{-3} / T$
- $2 x 10^3 / T$
- $T / 2 x 10^{-3}$
- $T / 2 x 10^3$
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Question 19 of 28

19. Question
What should be done from the results gathered?
- Line graph
- Venn diagram
- Bar graph
- Pie chart
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Question 20 of 28

20. Question
When plotting a graph from the results carried out by the iodine clock test, which variable will be on the y-axis?
- Initial rate
- Iodine concentration
- Iodine volume
- Iodine pH
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Question 21 of 28

21. Question
When plotting a graph from the results carried out by the iodine clock test, which variable will be on the x-axis?
- Iodine concentration
- Initial rate
- Iodine volume
- Iodine pH
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Question 22 of 28

22. Question
What should be calculated from the graph plotted with the initial rate against the iodine concentration?
- Gradient
- Shape of graph
- Line of best fit
- Half life
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Question 23 of 28

23. Question
What should be calculated from the graph plotted with the initial rate against the iodine concentration?
- Order of reaction
- Shape of graph
- Line of best fit
- Half life
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Question 24 of 28

24. Question
What is the rate equation for the iodine clock test?
- $R = k [I^-] [S_2O_8^{-2}]$
- $R = k [I^-] [S_2O_8^{-2}]^2$
- $R = k[S_2O_8^{-2}]$
- $R = k [I^-]$
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Question 25 of 28

25. Question
What does ‘K’ stand for?
- Rate constant
- Rate
- Time
- Concentration
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Question 26 of 28

26. Question
Which type of brackets are used to show concentration?
- Square
- Bold
- Rounded
- Oval
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Question 27 of 28

27. Question
What should be calculated from the results of an iodine clock test?
- Rate constant
- pH
- Final rate
- Units
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Question 28 of 28

28. Question
Along with calculating the rate constant, what else should be calculated from the results of an iodine clock test?
- Units
- pH
- Final rate
- Volume
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