Question

Why is bond-making exothermic?

Answer 1

Bonding:

• Chemical bonding is creating a chemical compound by forming a chemical link between two or more atoms, molecules, or ions.

Exothermic:

• Bond-breaking is said to be endothermic because energy is consumed to create bonds and released when bonds are broken.
• And the process of bond formation is usually an exothermic process.
• The presence of bonds is due to the bonded atoms' lower energy state than independent atoms.
• As a result, heat should be discharged to reduce energy consumption or attain greater stability.
• Exothermic reactions are those in which the creation of bonds improves the stability of the reaction.

Example:

1. Hydrogen and Oxygen react to form Water.
2. It is an example of an exothermic reaction.

$$\begin{gathered} 2{\mathrm{H}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \mathrm{\Delta H}°(298\mathrm{K})=–483.7\mathrm{kJ}{\mathrm{mol}}^{-1} \end{gathered}$$

Hence, bond-making is exothermic because of the release of energy.