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As a chemical reaction occurs, the thermometer in the container records a decrease in temperature. What is true of the reaction?

A The reaction is endothermic because heat was released by the reaction.

B The reaction is exothermic because heat was taken in by the reaction.

C The reaction is endothermic because heat was taken in by the reaction.

D The reaction is exothermic because heat was released by the reaction.

User JoDG
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2 Answers

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The answer is A !!!!!!!!!!!!
User Vitali
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C.

Endothermic reactions result in a decrease of temperature as the reaction absorbs the heat energy. Exothermic (exo meaning outer) reactions release energy as heat or light, which would mean an increase of temperature.
User Ari Ronen
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