What does enthalpy describe?

Only the temperature of a system

Class 9 Chemistry · Chapter 5 · Test 2

Enthalpy and Heat

25 MCQs covering enthalpy, heat, heat content, enthalpy change, standard enthalpy of reaction, the difference between heat and enthalpy, energy transfer, and the relationship between enthalpy change and heat at constant pressure.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

Question 1
What is enthalpy represented by?
- AE
- BH
- CQ
- DT
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Answer: B
Enthalpy is represented by the symbol H.
Question 2
What does enthalpy describe?
- ATotal heat content of a system
- BOnly the mass of a system
- COnly the volume of a system
- DOnly the temperature of a system
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Answer: A
Enthalpy is related to the total heat content of a system.
Question 3
Can the total enthalpy of a system be measured directly?
- AYes
- BNo
- COnly at zero temperature
- DOnly for gases
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Answer: B
The total enthalpy of a system cannot be measured directly but changes in enthalpy can be measured comparatively easily.
Question 4
What is represented by delta H?
- AChange in enthalpy
- BTotal mass
- CTotal pressure
- DChange in volume
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Answer: A
Delta H represents the change in enthalpy of a system during a process.
Question 5
What happens to the enthalpy of a system when energy is absorbed?
- AIt decreases
- BIt increases
- CIt becomes zero
- DIt remains constant
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Answer: B
Absorption of energy increases the enthalpy of the system.

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