PAG 3.1 – Determination of the enthalpy change of neutralisation

Last updated: 11/03/2020

OCR-A A-Level Chemistry Physical chemistry PAG 3.1 – Determination of the enthalpy change of neutralisation

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Question 1 of 28

1. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, how much hydrochloric acid should be measured out?
- 25 cm $^3$
- 10 cm $^3$
- 50 cm $^3$
- 75 cm $^3$
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Question 2 of 28

2. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, what type of beaker should be used to hold the polystyrene cup?
- 250 cm $^3$
- 100 cm $^3$
- 150 cm $^3$
- 200 cm $^3$
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Question 3 of 28

3. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, how much sodium hydroxide should be measured out?
- 25 cm $^3$
- 10 cm $^3$
- 50 cm $^3$
- 75 cm $^3$
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Question 4 of 28

4. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, what should be used to measure out the hydrochloric acid?
- Measuring cylinder
- Beaker
- Conical flask
- Pipette
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Question 5 of 28

5. Question
Once the hydrochloric acid has been measured out correctly where should it be placed?
- Polystyrene cup
- Beaker
- Conical flask
- Plastic cup
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Question 6 of 28

6. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, what intervals should the temperature be recorded in?
- 1 minute
- 2 minute
- 3 minute
- 30 seconds
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Question 7 of 28

7. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, how long should the regular temperature recordings take place for?
- 10 minutes
- 5 minutes
- 15 minutes
- 2 minutes
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Question 8 of 28

8. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, what should be used to measure out the sodium hydroxide?
- Measuring cylinder
- Beaker
- Conical flask
- Pipette
Correct

Incorrect
Question 9 of 28

9. Question
What should be added to the polystyrene cup at the fourth minute?
- Sodium hydroxide
- Distilled water
- Hydrochloric acid
- Acidified potassium dichromate
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Question 10 of 28

10. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, what should be done when the sodium hydroxide is added to the polystyrene cup?
- The cup should be continuously stirred
- The cup should be kept in an ice bath
- The cup should have a lid on
- The cup should be heated
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Question 11 of 28

11. Question
When carrying out an experiment to determine the enthalpy change of neutralisation, what should be done with the results?
- Plot a line graph
- Plot a bar graph
- An ordered list
- Repeat the results
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Question 12 of 28

12. Question
A graph is drawn up to show the enthalpy change of neutralisation, which variable should be on the y-axis?
- Temperature
- Volume
- Concentration
- Time
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Question 13 of 28

13. Question
A graph is drawn up to show the enthalpy change of neutralisation, which variable should be on the x-axis?
- Time
- Volume
- Concentration
- Temperature
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Question 14 of 28

14. Question
A graph is drawn up to show the enthalpy change of neutralisation for the reaction between hydrochloric acid and sodium hydroxide, how many lines of best fit should be drawn?
- 2
- 1
- 3
- 4
Correct

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Question 15 of 28

15. Question
Once a line of best fit has been drawn, what should be done?
- Extrapolation
- A scatter graph is plotted
- Find the gradient
- The results are repeated
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Question 16 of 28

16. Question
A graph is drawn up to show the enthalpy change of neutralisation, how many minutes should the graph be extrapolated?
- 4
- 3
- 2
- 1
Correct

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Question 17 of 28

17. Question
Which of the following is the correct equation used to find the amount of energy absorbed within a neutralisation reaction?
- q = mcΔT
- q = mcT
- T = mcq
- ΔT = mc/q
Correct

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Question 18 of 28

18. Question
Within the equation used to calculate the energy absorbed by a reaction, what does ‘q’ stand for?
- Energy
- Heat exchange
- Mass
- Quantity
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Question 19 of 28

19. Question
Within the equation used to calculate the energy absorbed by a reaction, what does ‘m’ stand for?
- Mass
- Measure
- Modify
- Moment
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Question 20 of 28

20. Question
Within the equation used to calculate the energy absorbed by a reaction, what does ‘c’ stand for?
- Specific heat capacity
- Carbon
- Capacity
- Columbus
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Question 21 of 28

21. Question
What does the sign ‘Δ’ mean?
- A change
- Total
- Finish
- In addition
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Question 22 of 28

22. Question
Within the equation used to calculate the energy absorbed by a reaction, what does ‘T’ stand for?
- Temperature
- Time
- Temporal
- Trioxide
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Question 23 of 28

23. Question
Within the equation used to calculate the energy absorbed by a reaction, what does ‘ΔT’ stand for?
- Change in temperature
- Total time
- Total temperature
- Change in time
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Question 24 of 28

24. Question
Once the experiment to determine the enthalpy change of neutralisation using hydrochloric acid and sodium hydroxide is carried out, what should be calculated?
- Amount, in mol, of hydrochloric acid used
- Amount, in mol, of sodium hydroxide used
- Concentration of sodium hydroxide
- Concentration of hydrochloric acid
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Question 25 of 28

25. Question
What is one hazard when sodium hydroxide is used within an experiment?
- It can cause skin and eye irritation
- It is highly toxic
- It is highly flammable
- It is carcinogenic
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Question 26 of 28

26. Question
What is one hazard when hydrochloric acid is used within an experiment?
- It can cause skin and eye irritation
- It is highly toxic
- It is highly flammable
- It is carcinogenic
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Question 27 of 28

27. Question
Which of the following is a sufficient reason as to why the results of this experiment may have been inaccurate?
- Heat loss to the surroundings
- Not enough time
- Wrong concentrations
- A weighing boat was not used
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Question 28 of 28

28. Question
Which of the following is a sufficient reason as to why the results of this experiment may have been inaccurate?
- Incomplete combustion
- Not enough time
- Confusion between chemicals
- Eye judgement when reading a measuring cylinder
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