# Which one in this reaction is endothermic and which one is exothermic : A + B + Heat ⇌ C + D + E ?

## Is heat being added in the reactants to form the products or are the reactants absorbing heat?

Aug 4, 2018

An exotherm results in the release of heat to the surroundings...

#### Explanation:

And this may be represented symbolically by...

$A + B \rightarrow C + D + E + \Delta$

And so, heat, i.e. $\Delta$, is effectively one of the products of the reaction. On the other hand, an endotherm ABSORBS heat from the surroundings.

And so...

$A + B + \Delta \rightarrow C + D + E$

...is definitely endothermic...