Question

What do you mean by exothermic reaction?

Answer 1

• A chemical reaction in which heat is produced is called exothermic reaction.
• This reaction can be sustained without supply of energy from an external source.
• For example, Formation of ammonia

${\mathrm{N}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)\stackrel{∆}{\to }2{\mathrm{NH}}_3\left(\mathrm{g}\right)+\mathrm{Heat}$

• In the above reaction, heat is evolved. Therefore it is an exothermic reaction.