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Exothermic and Endothermic reactions

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1. What type of reaction is exothermic?

a) A reaction that releases heat energy

b) A reaction that absorbs heat energy

c) A reaction that releases light energy

d) A reaction that absorbs light energy

2. Which of the following is an example of an exothermic reaction?

a) Combustion of a candle

b) Photosynthesis in plants

c) Melting of ice

d) Dissolving sugar in water

3. What type of reaction is endothermic?

a) A reaction that releases heat energy

b) A reaction that absorbs heat energy

c) A reaction that releases light energy

d) A reaction that absorbs light energy

4. Which of the following is an example of an endothermic reaction?

a) Combustion of a candle

b) Photosynthesis in plants

c) Melting of ice

d) Dissolving sugar in water

5. In an exothermic reaction, what happens to the enthalpy of the system?

a) It increases

b) It decreases

c) It stays the same

d) It fluctuates

6. In an endothermic reaction, what happens to the enthalpy of the system?

a) It increases

b) It decreases

c) It stays the same

d) It fluctuates

7. Which of the following is true about exothermic reactions?

a) They release energy in the form of heat

b) They absorb energy in the form of heat

c) They release energy in the form of light

d) They absorb energy in the form of light

8. Which of the following is true about endothermic reactions?

a) They release energy in the form of heat

b) They absorb energy in the form of heat

c) They release energy in the form of light

d) They absorb energy in the form of light

9. In an exothermic reaction, what happens to the temperature of the system?

a) It increases

b) It decreases

c) It stays the same

d) It fluctuates

10. In an endothermic reaction, what happens to the temperature of the system?

a) It increases

b) It decreases

c) It stays the same

d) It fluctuates

Answers:

    1. a
    2. a
    3. b
    4. d
    5. b
    6. a
    7. a
    8. b
    9. a
    10. b

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