Question

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

Answer 1

Answer:

reaction in which heat energy is liberated by the reactants is called exothermic reaction. eg: Carbon + Oxygen gives Carbon Dioxide + Q.

reaction in which heat energy is absorbed by the reactants is called endothermic reaction. eg: Nitrogen + Oxygen gives 2 nitrous oxide (2NO) - Q.

Explanation:

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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