Question

What is meant by exothermic and endothermic reaction? Give examples to explain the same.

Answer 1

Answer:

Exothermic reaction :- such chemical reaction in which heat is evolved with the product are called exothermic reaction

Example :- CH4(g) + 2o2(g) - co2(g) + h2o (l ) + heat energy

endothermic reaction :- such chemical reaction in which heat energy is absorbed are called endothermic reaction

Example :- 2pb (no3) 2 (s) - 2 pbo (s) + 4 No2 ( g) + o2 ( g)

Answer 2

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• An exothermic reaction is one that releases heat.
• If 1 mole of N2 molecule reacts with 1 mole of O2 molecule, the heat of 184 KJ has to be supplied to initiate the reaction to give 1 mole of NO molecule. This means that the bonds between N – N and O – O are so strong that they do not break easily. N2 has triple covalent bond between the two N atoms. O2 has a double covalent bond. Thus energy has to be put into the reaction to break the strong bonds. Thus the above reaction is a good example of an endothermic reaction.