Question

Explain exothermic and endothermic
reactions through example​

Answer 1

Answer:

Exothermic Reactions:

⇒ Heat is given out to surroundings.

⇒ Sum of enthalpies of products is less than sum of enthalpies in reactants.

⇒ Heat of reaction, ΔH is negative.

⇒ Products are more stable than reactants.

⇒ Example: N₂ (g) + O₂ (g) + Heat → 2NO (g).

Endothermic Reactions:

⇒ Heat is absorbed from surroundings.

⇒ Sum of enthalpies of products is greater than sum of enthalpies of reactants.

⇒ Heat of reaction, ΔH is positive.

⇒ Products are less stable than reactants.

⇒ Example: C₂ + O₂ (g) → CO₂ (g) + Heat.

Explanation:

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Answer 2

Exothermic reaction :

When energy is released in the form of heat during the reaction, it is called an exothermic reaction. The heat evolved is shown by a plus sign on the right-hand side of the equation.

For example :

$\sf N_{2} (g) + 3 H_{2} (g) \longrightarrow 2NH_{3} (g) + 92 kJ$

Endothermic reaction :

When energy is absorbed as heat during a reaction it is called an endothermic reaction the heat absorbed is shown by a plus sign on the left hand side of the equation or with the negative side on right hand side.

For example :

$\sf N_{2} (g) + O_{2} (g) + 180 kJ \longrightarrow 2NO (g)$

⠀ ⠀⠀ ⠀ ⠀⠀ OR

$\sf N_{2} (g) + O_{2} (g) \longrightarrow 2NO (g) - 180 kJ$