Which statement describes an exothermic reaction?

It releases heat to the surroundings

It absorbs heat from the surroundings

Class 9 Chemistry · Chapter 5 · Test 10

Energetics Full Test

25 MCQs covering the complete chapter including systems and surroundings, enthalpy, heat, exothermic and endothermic reactions, bond energies, activation energy, reaction profiles, catalysts, respiration, and biological energy.

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 the part of the universe being studied in a chemical reaction called?
- ASurroundings
- BSystem
- CCatalyst
- DTransition state
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Answer: B
The system is the part of the universe selected for study.
Question 2
What is everything outside the system called?
- AReactants
- BProducts
- CSurroundings
- DTransition state
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Answer: C
Everything outside the system is called the surroundings.
Question 3
What is the SI unit commonly used for measuring heat energy?
- AGram
- BJoule
- CMole
- DPascal
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Answer: B
Heat energy is measured in joules.
Question 4
What does ΔH represent?
- ATotal mass of reactants
- BEnthalpy change of a reaction
- CActivation energy only
- DNumber of molecules
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Answer: B
ΔH represents the change in enthalpy during a reaction.
Question 5
Which statement describes an exothermic reaction?
- AIt absorbs heat from the surroundings
- BIt releases heat to the surroundings
- CIt has a positive ΔH
- DIt always requires heating
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Answer: B
An exothermic reaction releases heat energy to the surroundings and has a negative ΔH.

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