If an increase in temperature accompanies a reaction, what occurred?
a. energy absorbed
b. energy created
c. energy released
d. energy destroyed

Answer : If an increase in temperature accompanies a reaction, energy is released.

Explanation :

In thermodynamics, the reaction is considered as a system and the medium in which the reaction occurs which is usually an aqueous medium is considered as its surrounding.

When the heat flows from the system to its surrounding, it increases the temperature of surrounding medium because the heat released by the system is absorbed by its surrounding. This is known as exothermic reaction.

An exothermic reaction is always accompanied by energy release.

On the other hand, when the heat flows from the surrounding towards system, it decreases the temperature of the surrounding medium.This is known as endothermic reaction.

From the above discussion we can say that If an increase in temperature accompanies a reaction,energy is released.