Question

In a reaction '+ heat' is written on the right-hand side, what type of reaction is it?

Answer 1

Exothermic reactions are reactions in which energy is released in the form of heat. For example, the burning of methane gives out energy.

$\underset{\mathrm{methane}}{{\mathrm{CH}}_4\left(\mathrm{g}\right)}+\underset{\mathrm{oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Dioxide}}{\underset{\mathrm{carbon}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}}+\underset{\mathrm{water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}+\mathrm{Heat}$

So in this reaction along with the products the heat is also released which is shown on the right hand with the symbol of + which means excess heat is given out.

Thus '+ heat' is written on the right-hand side, an exothermic reaction.