What does one mean by exothermic and endothermic reactions? Give
examples.
Answers
★ Endothermic reaction :-
The reaction in which heat is absorbed is called as endothermic reaction.
◾Endothermic reaction is opposite to exothermic reaction.
◾In this process, there is the increase in the enthalpy H.
◾Example → photosynthesis : It is an example of endothermic reaction because it absorbs heat energy from the sunlight.
★ Exothermic reaction :-
The reaction in which heat is released is called as exothermic reaction.
◾Exothermic reaction is opposite to endothermic reaction.
◾In this process, heat is released and the replacement of weak bonds with stronger ones takes place.
◾Example → the burning of the natural gas.
Explanation:
Exothermic reaction
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.
Endothermic reaction
An endothermic process absorbs heat and cools the surroundings.”