Question

what is exothermic and endothermic reaction? give example

Answer 1

Answer:

those reaction in which released heat during reaction called endothermic reaction.

example:burning of coal.

those reactions which evolved heat during reaction called exothermic reactions.

example:combustion reactions.

Explanation:

Her is answer, hope it is helpful.

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.