Question

Which Reaction is Exothermic?

Answer 1

Exothermic reaction:

• An exothermic reaction is a reaction in which the evolution of energy is experienced in the form of heat or light.
• In an exothermic reaction, the change in energy $\left(∆\mathrm{H}\right)$ is negative, i.e., $\left(∆\mathrm{H}<0\right)$.
• where, $∆\mathrm{H}=\mathrm{energy}\mathrm{used}\mathrm{in}\mathrm{bond}\mathrm{formation}-\mathrm{energy}\mathrm{released}\mathrm{when}\mathrm{the}\mathrm{bonds}\mathrm{are}\mathrm{broken}$.
• The exothermic reaction generally takes place in the case of a spontaneous process.
• Examples could be from burning or fuel to nuclear fusion in the burning of the Sun.
• Combustion reactions are generally considered an exothermic reactions.