Is matter around us pure? · क्या हमारे आस-पास के पदार्थ शुद्ध हैं?
A free Chemistry lesson for Class 9 children.
A pure substance has only one kind of particle. A mixture has two or more.
A solution is a homogeneous mixture, such as salt dissolved in water.
The solute dissolves in the solvent to make a solution.
A suspension has large particles that settle down and can be filtered out.
A colloid such as milk scatters a beam of light. This is the Tyndall effect.
Filtration separates an insoluble solid from a liquid.
The solid left on the filter paper is the residue. The clear liquid is the filtrate.
Evaporation, distillation and chromatography also separate mixtures.