Required practical – Investigation of how the rate of a reaction changes with temperature.

Last updated: 02/11/2022

WJEC A-Level Chemistry Unit 2.1 – Thermochemistry Required practical – Investigation of how the rate of a reaction changes with temperature.

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Question 1 of 24

1. Question
During the reaction between sodium thiosulfate and hydrochloric acid how can the rate of reaction be measured?
- By measuring the time taken for a fixed amount of sulfur to form
- By measuring a change in concentration
- By measuring a colour change
- By finding the volume of sulfur oxide released
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Question 2 of 24

2. Question
What are the units for the real gas constant?
- J $K^{-1} mol^{-1}$
- KJ mol
- $KJ mol^{-1}$
- $J mol^{1}$
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Question 3 of 24

3. Question
When carrying out an experiment to find the rate of the reaction between sodium thiosulfate and hydrochloric acid, what type of beaker should be used?
- 400 cm $^3$
- 500 cm $^3$
- 200 cm $^3$
- 100 cm $^3$
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Question 4 of 24

4. Question
Describe the relationship between a change in temperature and the change in the rate constant?
- As the temperature changes the rate constant changes
- As the rate constant changes the temperature stays the same
- As the temperature changes the rate constant stays the same
- There is no relationship between the two factors
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Question 5 of 24

5. Question
When carrying out an experiment to find the rate of the reaction between sodium thiosulfate and hydrochloric acid, what type of measuring cylinder should be used?
- 10 cm $^3$
- 20 cm $^3$
- 25 cm $^3$
- 30 cm $^3$
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Question 6 of 24

6. Question
Which method of measuring the rate of a reaction is the most efficient when calculating the rate of the reaction between sodium thiosulfate and hydrochloric acid?
- Using a cross underneath a beaker to find the time taken for a precipitate to form
- Measuring the change in concentration
- Measuring the change in mass of sodium thiosulfate
- Measuring the amount of gas released
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Question 7 of 24

7. Question
Describe the concentration of the reactants as the experiment between sodium thiosulfate and hydrochloric acid as the different temperatures are measured.
- They are all the same
- They are all different
- There is no change
- There is no relationship
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Question 8 of 24

8. Question
What equation is used to work out the initial rate of reaction?
- Amount of sulfur / time
- Amount of sodium / time
- Time / amount of sulfur
- Time x amount of sulfur
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Question 9 of 24

9. Question
What is the initial rate of reaction proportional to?
- 1 / time
- Time
- 2 / time
- 1 / volume
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Question 10 of 24

10. Question
In terms of the rate constant, what is the temperature measured in?
- K
- Joules
- °C
- °
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Question 11 of 24

11. Question
What does ‘K’ stand for?
- Kelvin
- Kilo
- Kilogram
- Kinetic
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Question 12 of 24

12. Question
Which of the following equations can be used to find temperature?
- k = A $e^{-E_a/RT}$
- k = R $T^{-Ae}$
- k = R $T^{-EA}$
- k = $A^{-E_a/e}$
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Question 13 of 24

13. Question
Which gas is given off during the reaction between sodium thiosulfate and hydrochloric acid?
- Sulfur dioxide
- Thionyl chloride
- Carbon dioxide
- Carbon monoxide
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Question 14 of 24

14. Question
When finding the initial rate of reaction of the reaction between sodium thiosulfate and hydrochloric acid, which graph can be plotted?
- In 1/T
- RT 1/T
- Ae 1/T
- K 1/T
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Question 15 of 24

15. Question
Which solid is formed during the reaction between sodium thiosulfate and hydrochloric acid?
- Sulfur
- Sodium sulfate
- Sodium
- Hydrogen
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Question 16 of 24

16. Question
How should the gradient be represented on a graph of ln 1/T
- A straight line
- Circular
- A quadratic
- A curved line
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Question 17 of 24

17. Question
Which salt is formed during the reaction between sodium thiosulfate and hydrochloric acid?
- Sodium chloride
- Sodium hydride
- Sodium iodide
- Sodium oxide
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Question 18 of 24

18. Question
Which of the following represent the gradient of a ln 1/T graph?
- -Ea / R
- -A / T
- -Ae / R
- -RT / Ae
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Question 19 of 24

19. Question
During the reaction between sodium thiosulfate and hydrochloric acid, what should be used to minimise heat loss?
- The use of a lid
- Continuous stirring
- Wrapped in cotton wool
- Wrapped in foil
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Question 20 of 24

20. Question
What are the units for activation energy?
- $KJ mol^{- 1}$
- $KJ^{-1} mol^{-1}$
- $K^{-1} J mol^{-1}$
- KJ mol
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Question 21 of 24

21. Question
What is the equation for the reaction between sodium thiosulfate and hydrochloric acid?
- $Na_2S_2O_3(aq) + 2HCl(aq) -> 2NaCl(aq) + SO_2(g) + H_2O(l)+ S(s)$
- $Na_2S_2O_3(aq) + HCl(aq) -> 2NaCl(aq) + SO_2(g) + H_2O(l)$
- $2Na_2S_2O_3(aq) + 2HCl(aq) -> 4NaCl(aq) + 2SO(g) + S(s)$
- $Na_2S_2O_3(aq) + HCl(aq) - > NaCl(aq) + S(s)$
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Question 22 of 24

22. Question
What is the value of the real gas constant?
- 8.31
- 4.18
- 10.3
- 9.8
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Question 23 of 24

23. Question
What form of sulfur is produced during the reaction between sodium thiosulfate and hydrochloric acid?
- A precipitate
- Aqueous
- Dissolved
- Gaseous
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Question 24 of 24

24. Question
What does ‘R’ stand for?
- Real gas constant
- Resonance
- Resistant gas constant
- Real gas
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