Question

All decomposing reaction are exothermic reaction

Answer 1

YES, All decomposition reaction are exothermic. But there are some reaction which are endothermic as they involve breaking of bonds. Breaking bonds requires an input of energy, while forming bonds releases energy.

CONCLUSION--:

DECOMPOSITION REACTION ARE EXOTHERMIC AND ENDOTHERMIC

Answer 2

Answer:

Explanation:

(i) A reaction in which heat is given away when

reactants are transformed into the products is

called as exothermic reaction.

(ii) e.g. formation of ice from water, dissolution of

sodium hydroxide in water.

(iii) When solid NaOH is dissolved in water, heat

is given out and therefore, the temperature

increases.

(iv) NaOH(s) + H2

O(l) → NaOH(aq) + Heat

Sodium

hydroxide

Water Sodium hydroxide

solution