Exothermic reaction :: reaction in which heat is released along with the formation of products are called exothermic chemical reaction
Eg.. burning of natural gas



Endothermic reaction ::Reaction in which energy is absorbed
Eg.. N2 +O2+ heat =2NO

Exothermic and Endothermic Reactions

Exothermic Reaction:
An exothermic reaction is a chemical reaction that releases energy in the form of heat. In such reactions, the energy of the products is lower than the energy of the reactants. As a result, the excess energy is released into the surroundings, usually in the form of heat. Exothermic reactions are characterized by a rise in temperature.

Example of an Exothermic Reaction:
One example of an exothermic reaction is the combustion of gasoline. When gasoline burns in the presence of oxygen, it reacts to produce carbon dioxide and water vapor, releasing a significant amount of energy in the process. The energy released is in the form of heat and light, which is why we observe flames and feel warmth when gasoline burns.

Endothermic Reaction:
In contrast, an endothermic reaction is a chemical reaction that absorbs energy from its surroundings. The energy of the products is higher than the energy of the reactants in such reactions. As a result, these reactions require an input of energy to proceed, usually in the form of heat. Endothermic reactions are characterized by a decrease in temperature.

Example of an Endothermic Reaction:
One example of an endothermic reaction is the process of photosynthesis. In photosynthesis, plants convert carbon dioxide and water into glucose and oxygen, using energy from sunlight. The energy from the sun is absorbed by the plants and used to fuel the reaction. This is why plants require sunlight to carry out photosynthesis and why they are often observed to thrive in well-lit areas.

Key Points:
- An exothermic reaction releases energy in the form of heat, while an endothermic reaction absorbs energy.
- Exothermic reactions are characterized by a rise in temperature, while endothermic reactions are characterized by a decrease in temperature.
- An example of an exothermic reaction is the combustion of gasoline, which releases heat and light energy.
- An example of an endothermic reaction is photosynthesis, which requires energy from sunlight to convert carbon dioxide and water into glucose and oxygen.