An exothermic reaction is a chemical reaction that releases heat. It gives net energy to its surroundings. That is, the energy needed to initiate the reaction is less than the energy released. The enthalpy change, Δ H , of a chemical reaction is much easier to work with.

The reaction in which heat is evolved is called as exothermic reaction.
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Exothermic Reaction: Heat is evolved

An exothermic reaction is a chemical reaction that releases energy in the form of heat, light, or sound. During an exothermic reaction, the products have less energy than the reactants, and the difference in energy is released as heat. This means that the surroundings become hotter as heat is evolved.

Examples of Exothermic Reactions

Some common examples of exothermic reactions include:

- Combustion of fuels such as wood, coal, and gasoline
- Rusting of iron
- Neutralization of an acid with a base
- Formation of water from hydrogen and oxygen gas

Why Heat is Evolved in Exothermic Reaction?

When a chemical reaction takes place, bonds between atoms are broken and new bonds are formed. The energy required to break bonds is called the activation energy, and the energy released when new bonds are formed is called the heat of reaction. In an exothermic reaction, the heat of reaction is negative because energy is released.

The amount of heat released depends on the amount of energy required to break the bonds in the reactants and the amount of energy released when new bonds are formed in the products. The difference between these two values is the heat of reaction.

Impact on Temperature

Since exothermic reactions release heat, they can cause an increase in temperature in the surroundings. This is why exothermic reactions are often used in hand warmers and other heating devices. On the other hand, endothermic reactions absorb heat from the surroundings, causing a decrease in temperature.

Conclusion

In summary, exothermic reactions are chemical reactions that release energy in the form of heat, light, or sound. The heat of reaction is negative because energy is released when new bonds are formed in the products. This means that the surroundings become hotter as heat is evolved.