Question

Define pure substances

Answer 1

An element is a pure substance which consists of only one kind of particles – either atoms or molecules of same type of atoms.

Copper

silver

Hydrogen

Sulphur are some examples of elements.

Answer 2

Pure substance in chemical terms.

Pure substances are those which are made up of only one type of element or compound.

Examples of pure substances:
1.Water containing only H₂O compound is pure.
2.Pure silver metal only contains Silver(Ag) atoms.
3.pure Diamond have only Carbon(C) atoms.

Examples of impure substances:
1.Sugar solution contains water(H₂0) and sugar(C₁₂H₂₂O₁₁)
2.Tap water have water(H₂O),Fluorine(F⁻),Sulphate(SO₄)²⁻ and many other ions.