Question

what is the exothermic for example give me​

Answer 1

Answer:

Breaking of bonds and evaporation of water both require heat from outside source to take place. Hence they are endothermic reactions.

Addition of two chemicals can be either endo or exothermic.

However lighting of a match gives out heat, hence it is an exothermic reaction

Answer 2

Answer:

An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones. (Examples )are numerous: combustion, the thermite reaction, combining strong acids and bases, polymerizations. As an example in everyday life, hand warmers make use of the oxidation of iron to achieve an exothermic reaction: 4Fe + 3O2 → 2Fe2O3 ΔH⚬ = - 1648 kJ/mol.

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