# What is a chemical reaction in which heat is released as a product called?

Jul 7, 2016

This is called $\text{an exothermic reaction}$

#### Explanation:

Any reaction in which energy can be treated as a product is termed $\text{exothermic:}$

$C {H}_{4} \left(g\right) + 2 {O}_{2} \rightarrow C {O}_{2} \left(g\right) + 2 {H}_{2} O \left(l\right) + \Delta$

On the other hand, where energy appears as a reactant, the reaction is termed $\text{endothermic} :$

$N a C l \left(s\right) + \Delta \rightarrow N {a}^{+} \left(a q\right) + C {l}^{-} \left(a q\right)$