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What does one mean by exothermic and end...

What does one mean by exothermic and endothermic reactions ? Give examples.

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Exothermic reactions : Those reactions in when energy is released are called exothermic reactions.
Examples : (i) All combustion reactions like
`CH_4 + 2O_2 to CO_2 + 2H_2O + "Heat"`
(ii) Thermite reactions like
`2Al + Fe_2O_3 to 2Fe + Al_2O_3 + "Heat"`
Endothermic reactions : Those reactions in when energy is utilised are called endothermic reactions.
`CaCO_3 overset("heat")(rarr) CaO + CO_2`
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