what is the meaning of exothermic and endothermic reaction give examples
Answers
Answer:
Exothermic Reaction : Exothermic reactions are reactions that release energy into the environment in the form of heat. Exothermic reactions may be explosive also.
Nuclear explosion is one of the example
Endothermic Reaction: These reactions absorb heat from the environment.
Melting ice can be counted as its example
The chemical reactions release energy in the form of heat, light, or sound, are called exothermic reactions. An exothermic reaction occurs when the temperature of a system increases due to the evolution of heat. This heat is released into the surroundings, resulting in an overall negative quantity for the heat of reaction.
An example of an exothermic reaction is the mixture of sodium and chlorine to yield table salt. This reaction produces 411kJ of energy for each mole of salt that is produced:
2Na(s)+Cl
2
(s)→2NaCl(s)+energy
The chemical reactions that must absorb energy in order to proceed are known as endothermic reactions. An endothermic reaction occurs when the temperature of an isolated system decreases while the surroundings of a non-isolated system gain heat. Endothermic reactions result in an overall positive heat of reaction.
Photosynthesis is an example of an endothermic chemical reaction. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen.
Or in short you can write:
Exothermic Reaction: A chemical reaction in which heat is given out is known as exothermic reaction.
Endothermic Reaction: A chemical reaction in which heat energy is absorbed is known as endothermic reaction.
Examples are given un the picture
