What does one mean by exothermic and endothermic reactions? Give examples.

By Shivank Goel|Updated : August 11th, 2022

We have to explain exothermic and endothermic reactions with examples.

Exothermic reactions:

An exothermic reaction is a reaction that involves the release of energy in the form of light or heat.

This implies that the energy is transferred into the surroundings.

The temperature of a system increases due to the evolution of heat, resulting in an overall negative quantity for the heat of reaction.

Example: A mixture of sodium and chlorine to yield table salt produces 411 KJ of energy for each mole of salt produced.

2Na(s) + Cl2(s) --> 2NaCl(s) + energy

Endothermic reactions:

An endothermic reaction is a reaction that involves the absorption of energy in the form of heat.

These chemical reactions lower the temperature of their surrounding area, thereby creating a cooling effect.

The temperature of an isolated system decreases while the surroundings of a non-isolated system gain heat, resulting in an overall positive quantity for the heat of reaction.

Example: Ammonium chloride dissolved in water dissociates into ammonium and chloride ions by absorbing heat from the surroundings.

NH4Cl (s) + H2O (l) ⟶ NH4Cl (aq) - Heat

Therefore, an exothermic reaction is a reaction that involves the release of energy in the form of light or heat and an endothermic reaction is a reaction that involves the absorption of energy in the form of heat.

Summary:

What does one mean by exothermic and endothermic reactions? Give examples.

An exothermic reaction is a reaction that involves the release of energy in the form of light or heat and an endothermic reaction is a reaction that involves the absorption of energy in the form of heat.

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