Question

Which of the following changes are exothermic and endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dilution of sodium hydroxide in water

(d) Dissolution of ammonium chloride salt in water

Answer 1

Exothermic reactions: Chemical reactions which liberate heat energy

Endothermic reactions: Chemical reactions which absorb heat energy

From the following mentioned reactions, reactions that are endothermic and exothermic in nature are:

$\bullet$ Exothermic reactions: (b), (c) [1 mark]
$\bullet$ Endothermic reactions: (a), (d) [1 mark]