Exothermic and Endothermic Reactions Review

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Flashcards for reviewing exothermic and endothermic reactions.

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14 Terms

1
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What is an exothermic reaction?

A reaction that releases heat to the surroundings.

2
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What is an endothermic reaction?

A reaction that absorbs heat from the surroundings.

3
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What does a negative ΔH value mean in a thermochemical equation?

It indicates that the reaction is exothermic, meaning heat is released.

4
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Why is photosynthesis considered an endothermic reaction?

Because it requires energy (sunlight) to convert carbon dioxide and water into glucose and oxygen.

5
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In an __ reaction, what happens to energy?

Energy is released to the surroundings.

6
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In an __ reaction, what happens to energy?

Energy is absorbed from the surroundings.

7
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The thermochemical equation for the combustion of methane, CH4 + 2O2 → CO2 + 2H2O, includes ΔH = -890kJ, indicating it is __.

Exothermic

8
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Photosynthesis is an example of an __ reaction because it requires energy from sunlight.

Endothermic

9
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In an exothermic reaction, the value of ΔH is __.

Negative

10
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Which statement best describes an exothermic reaction?

It releases energy.

11
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What does a positive ΔH indicate in a thermochemical equation?

The reaction is endothermic.

12
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Which of the following is an example of an endothermic reaction?

Photosynthesis

13
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The reaction 2H₂ + O₂ → 2H₂O, ΔH = -572kJ, is:

Exothermic

14
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In which reaction would you expect the temperature of the surroundings to decrease?

Dissolving ammonium nitrate in water.