Question

what is exothermic and endothermic reactions.... give examples of each.

Answer 1

Exothermic Reaction: A chemical reaction in which heat is given out is known as exothermic reaction. For example burning

Endothermic Reaction: A chemical reaction in which heat energy is absorbed is known as endothermic reaction. For example electrolysis

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Answer 2

Exothermic reactions are those reactions in which energy is given out. For ex - when coal burns in air it is Exothermic reaction
C+ 02 = CO2 + heat.

Endothermic reaction are those reactions in which energy is absorbed in the form of heat light or electricity.
For ex-electrolysis of water. In this reaction water by the application of electricity splits into hydrogen and oxygen