Question

Write the classification of pure substance?

Answer 1

In chemistry a substance is a form of matter, it can be a solid, a liquid or a gas. Even elements, compounds and mixtures come under the category of substance. And, a pure substance will containsame type of particles, without any impurity. So, a pure substance can be an element or a compound.*.Pure substances*.Fixed composition*.Constituents cannot be separated by simple physical methods.*.Elements contain only one type of particles ? atoms (example Na, K, Cu, C, Ag) or molecules [Example: H2, N2, O2, F2]*.Compounds are formed by the combination of two or more atoms of different elements. [Example: water (H2O), carbon dioxide (CO2)]*.Constituents of compounds cannot be separated by physical methods; they can be separated by chemical methods only.