Class 9 Chemistry · Chapter 5 · Test 3
Exothermic and Endothermic Reactions
25 MCQs covering exothermic and endothermic reactions, heat absorption and evolution, signs of enthalpy change, examples of exothermic and endothermic reactions, combustion, energy transfer, and reaction reversibility.
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 an exothermic reaction?
- AA reaction that absorbs heat
- BA reaction that releases heat
- CA reaction that stops immediately
- DA reaction that absorbs light
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Answer: B
An exothermic reaction releases heat energy to the surroundings.
Question 2
What is an endothermic reaction?
- AA reaction that releases heat
- BA reaction that absorbs heat
- CA reaction that produces no energy
- DA reaction that always produces light
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Answer: B
An endothermic reaction absorbs heat energy from the surroundings.
Question 3
What happens to the surroundings during an exothermic reaction?
- AThey usually become warmer
- BThey always become colder
- CThey lose all their matter
- DThey become the system
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Answer: A
Heat released by the system is transferred to the surroundings and usually raises their temperature.
Question 4
What happens to the surroundings during an endothermic reaction?
- AThey usually become warmer
- BThey usually become cooler
- CThey become products
- DThey gain mass
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Answer: B
The system absorbs heat from the surroundings so the surroundings usually become cooler.
Question 5
What is the sign of delta H for an exothermic reaction?
- APositive
- BNegative
- CZero
- DUndefined
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Answer: B
Exothermic reactions release energy so their enthalpy change is negative.
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