Question

What do we mean by exothermic and endothermic reaction? Explain.

Answer 1

Answer:

Explanation:

Exothermic Reaction: A chemical reaction in which heat is given out is known as exothermic reaction.

eg:- Melting ice cubes.

       Melting solid salts.

       Evaporating liquid water.

Endothermic Reaction: A chemical reaction in which heat energy is absorbed is known as endothermic reaction.

eg:- Condensation of rain from water vapor.

       Mixing water and strong acids or strong bases.

        Mixing acids and bases.

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