Question

Classify the following as endothermic and exothermic reactions.

(a) Decomposition of ferrous sulphate

(b) Respiration

(c) Burning of natural gas

Answer 1

A chemical reaction that includes the release of energy in the form of heat or light is known as an exothermic reaction. Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

(b) and (c) are exothermic reactions as heat is released in each of the reactions.
[2 Marks]
Option (a) is endothermic as heat is absorbed during decomposition reaction.
[1 Mark]