What are Exothermic and Endothermic reactions? Give one example of each of them.

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Solution

Exothermic reactions are those reactions in which heat is released.
$R e a c t a n t ⟶ P r o d u c t s + h e a t$
$Reactants→products+heat\displaystyle Reactants \rightarrow products + heat$ For example, when carbon combines with oxygen to form carbon dioxide, heat is evolved during the reaction. So it is an exothermic reaction.
$C (s) + O_{2} (g) \to + C O_{2} (g) + H e a t$
Endothermic reactions are those reactions in which heat is absorbed.
$Reactants+heat→products\displaystyle Reactants + heat \rightarrow products$ $R e a c t a n t + h e a t ⟶ P r o d u c t s$
For example, nitrogen reacts with the oxygen to form nitric oxide, in this reaction heat is absorbed to carry out the reaction, hence this reaction is endothermic.
$N_{2} (g) + O_{2} (g) + H e a t \to + 2 N O (g)$
$→\displaystyle C(s) + O_2(g) \: \rightarrow$
$\displaystyle N_2(g) + O_2(g) + Heat \rightarrow 2NO(g) \:$

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