Question

endothermic and exothermic reaction​

Answer 1

$\huge\red{\boxed{\bold{Answer}}}$

$\large\underline\mathrm\orange{Exothermic \: Reaction:-}$

$\large\underline\mathrm\red{A}$ reaction is said to be exothermic when heat is evolving, i.e., heat or enthalpy of the product is less than that of the reactant. Heat of reaction of exothermic reactions is expressed in two ways.

$\large\underline\mathrm\pink{A \: + \: B \: => \: product \: + \: Q \: cal}$

$\large\underline\mathrm\green{Or}$

$\large\underline\mathrm\pink{A \: + \: B \: => \: product;}$ ∆H = Q cal

$\large\underline\mathrm\orange{Endothermic \: Reaction:}$

$\large\underline\mathrm\red{In}$ endothermic reactions, heat is absorbed, i.e., heat of the product is greater than heat of the reaction. The heat of reaction of endothermic reactions may also be represented in two ways.

$\large\underline\mathrm\pink{A \: + \: B \: => \: product \: - \: Q \: cal}$

$\large\underline\mathrm\green{Or}$

$\large\underline\mathrm\pink{A \: + \: B \: => \: product;}$ ∆H = Q cal

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Answer 2

1) Exothermic reactions - Those reactions in which heat is evolved .

♥ Examples :-

(i) C (s) + O2 (g) → CO2 (g) + Heat

(ii) N2 (g) + 3H2 (g) → 2NH3 (g) + Heat

2) Endothermic reactions - Those reactions in which heat is absorbed .

♥ Examples :-

(i) C (s) + 2S (s) → CS2 (l) – Heat

(ii) N2 (g) + O2 (g) → 2NO(g) – Heat