Question

Classify the following into elements, compounds and mixtures :
(sodium, soil, sugar solution, silver, calcium, carbonate, tin, silicon, coal, air, soap, methane, carbon dioxide, blood).

Answer 1

(1) Elements: Sodium, silver, tin and silicon since they are made of a single kind of atoms.

(2) Compounds: Calcium carbonate, soap, methane and carbon dioxide since they are made of two or more kinds of atoms in definite proportion.

(3) Mixtures: Soil, sugar solution, coal, air and blood since they are made of two or more kinds of compounds that are not in definite proportion.