Question

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?

Answer 1

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

Explanation:

And this may be represented symbolically by...

`A+BrarrC+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+ DeltararrC+D+E`

...is definitely endothermic...