# What does exothermic mean?

Mar 18, 2018

See Below.

#### Explanation:

What is the meaning of Exothermic?

Exo means giving out, and themic means heat-related.

So, Exothermic means something that gives out or liberates heat.

Here, We are dealing with Chemistry, Right?

So, Exothermic Change is a Change where heat is released or liberated.

I said change, as it can be physical or chemical change.

As Example,

Physical Exothermic Change :- Dissolving $N a O H$ in distilled

water. If you observe correctly, you will see that after $N a O H$ is

fully dissolved, the solution will become warmer than before.

$N a O H \left(s\right) {\rightarrow}^{{H}_{2} O} = N {a}^{+} \left(a q\right) + O {H}^{-} \left(a q\right) + \text{Heat}$

Chemical Exothermic Change :- Very common example of this

is Combustion.

If you burn coal in the presence of Air, it forms $C {O}_{2}$ with

liberation of heat, which continues the reaction.

$C + {O}_{2} = C {O}_{2} + \text{Heat}$ [Where $+ \text{ Heat}$ means heat is

liberated.]

You can know more about Exothermic Changes, here. This is a really fantastic article. I recommend it.

Hope this helps.