An exothermic reaction is a type of chemical reaction in which energy is released to the surroundings, usually in the form of heat, light, or sound. Because energy is given out, the temperature of the surroundings increases during an exothermic reaction.
Key features:
- Energy of the products is lower than the reactants.
- Heat is released rather than absorbed.
- Often feels warm or hot to touch.
Examples of exothermic reactions:
- Combustion of fuels like wood, coal, or petrol (produces heat and light).
- Respiration in living organisms, where glucose breaks down to release energy.
- Neutralization of an acid with a base (heat is released).
- Fireworks exploding, releasing heat, light, and sound.
Real-life connection:
- Campfires, burning candles, and even your body’s metabolism are exothermic processes.