PAG 3.2 – Determination of an enthalpy change of reaction by Hess’ Law

Last updated: 11/03/2020

OCR-A A-Level Chemistry Physical chemistry PAG 3.2 – Determination of an enthalpy change of reaction by Hess’ Law

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Question 1 of 28

1. Question
Write the equation for the reaction between potassium hydrogen carbonate and hydrochloric acid.
- $KHCO_3(s) + HCl(aq) -> KCl(aq) + CO_2(g) + H_2O(l)$
- $KHCO_3(s) + HCl(aq) -> KCl(aq) + CO_2(g) + H_2(l)$
- $KHCO_3(s) + HCl(aq) -> KCl(aq) + CO(g) + H_2O(l)$
- $KHCO_3(s) + HCl(aq) -> KCl(aq) + CO_2(g) + O_2(l)$
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Question 2 of 28

2. Question
Write the equation for the decomposition of potassium carbonate.
- $2K_2CO_3(s) -> K_2CO_3(s) + CO_2(g) + H_2O(l)$
- $2K_2CO_3(s) -> K_2CO_3(s) + H_2O(l)$
- $2K_2CO_3(s) -> K_2CO_3(s) + CO_2(g) + H_2(l)$
- $K_2CO_3(s) -> K_2CO_3(s) + CO_2(g) + H_2O(l)$
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Question 3 of 28

3. Question
Write the equation for the reaction between potassium carbonate and hydrochloric acid.
- $K_2CO_3(s) + 2HCl(aq) -> 2KCl(aq) + CO_2(g) + H_2O(l)$
- $K_2CO_3(s) + HCl(aq) -> 2KCl(aq) + CO_2(g) + H_2O(l)$
- $K_2CO_3(s) + 2HCl(aq) -> KCl(aq) + CO_2(g) + H_2O(l)$
- $K_2CO_3(s) + 2HCl(aq) -> 2KCl(aq) + CO_2(g)$
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Question 4 of 28

4. Question
What concentration of hydrochloric acid is used?
- 2.0 mol dm $^{-3}$
- 3.0 mol dm $^{-3}$
- 0.5 mol dm $^{-3}$
- 1.5 mol dm $^{-3}$
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Question 5 of 28

5. Question
What type of beaker should be used?
- 25 cm $^3$
- 150 cm $^3$
- 100 cm $^3$
- 50 cm $^3$
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Question 6 of 28

6. Question
What type of measuring cylinder should be used?
- 50 cm $^3$
- 150 cm $^3$
- 100 cm $^3$
- 50 cm $^3$
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Question 7 of 28

7. Question
How much hydrochloric acid should be measured out?
- 30 cm $^3$
- 40 cm $^3$
- 20 cm $^3$
- 10 cm $^3$
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Question 8 of 28

8. Question
What is one hazard when using hydrochloric acid within an experiment?
- It can cause skin and eye irritation
- It is highly flammable
- It is highly toxic
- It is carcinogenic
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Question 9 of 28

9. Question
What is one hazard when using potassium carbonate within an experiment?
- It can cause skin and eye irritation
- It is highly flammable
- It is highly toxic
- It is carcinogenic
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Question 10 of 28

10. Question
What is one hazard when using potassium hydrogen carbonate within an experiment?
- It can cause skin and eye irritation
- It is highly flammable
- It is highly toxic
- It is carcinogenic
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Question 11 of 28

11. Question
For safety when determining the enthalpy change of a reaction, which of the following should be done?
- Wear goggles
- Wear a lab coat
- Taken place in a fume cupboard
- Ensure the room is properly vented
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Question 12 of 28

12. Question
To how many decimal places should the balance used be to?
- 2
- 1
- 3
- 4
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Question 13 of 28

13. Question
What type of cup should be used?
- Polystyrene
- Plastic
- Cupboard
- Cotton
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Question 14 of 28

14. Question
What type of pipette should be used?
- Dropping pipette
- Transfer pipette
- Graduate pipette
- Volumetric pipette
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Question 15 of 28

15. Question
What state is potassium carbonate in?
- Solid
- Gaseous
- Aqueous
- Liquid
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Question 16 of 28

16. Question
What state is hydrochloric acid in?
- Aqueous
- Gaseous
- Solid
- Liquid
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Question 17 of 28

17. Question
What state is potassium hydrogen carbonate in?
- Solid
- Gaseous
- Solid
- Liquid
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Question 18 of 28

18. Question
Where should the hydrochloric acid be placed?
- Polystyrene cup
- Beaker
- Conical flask
- Plastic cup
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Question 19 of 28

19. Question
Where should the polystyrene cup be placed?
- Beaker
- Flask
- Ice bath
- Table
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Question 20 of 28

20. Question
How much potassium carbonate should be measured out?
- Between 2.5 grams and 3.0 grams
- Between 1.5 grams and 2.0 grams
- Between 0.2 grams and 0.5 grams
- Between 0.2 grams and 0.5 grams
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Question 21 of 28

21. Question
During reaction 1, what should be calculated?
- The heat absorbed
- The concentration of potassium carbonate
- The enthalpy change of reaction
- The boiling point of hydrochloric acid
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Question 22 of 28

22. Question
What should be calculated for potassium hydrogen carbonate?
- Moles
- Concentration
- Volume
- Molar mass
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Question 23 of 28

23. Question
During reaction 2, what should be calculated?
- The enthalpy change of reaction
- The concentration of potassium carbonate
- The heat absorbed
- The boiling point of hydrochloric acid
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Question 24 of 28

24. Question
How much potassium hydrogen carbonate should be measured out?
- Between 3.2 grams and 3.7 grams
- Between 2.5 grams and 3.0 grams
- Between 2.2 grams and 2.7 grams
- Between 1.4 grams and 1.8 grams
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Question 25 of 28

25. Question
What is the specific heat capacity of water?
- 4.18
- 3.19
- 6.02
- 9.80
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Question 26 of 28

26. Question
Which of the following type of reactions is correct for this reaction?
- Exothermic
- Neutralisation
- Endothermic
- Reversible
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Question 27 of 28

27. Question
What will the enthalpy be?
- Negative
- Neutral
- Positive
- Zero
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Question 28 of 28

28. Question
What should the enthalpy change of reaction roughly be?
- -37.5 kJ mol $^{-1}$
- 24.6 kJ mol $^{-1}$
- -24.6 kJ mol $^{-1}$
- 37.5 kJ mol $^{-1}$
Correct

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