Pure and Impure Substances

Pure Substances are made up of only one kind of Atoms or Molecules.
They are homogeneous in nature as the composition is uniform throughout the bulk.
They have definite set of properties such as density, boiling point and melting point.
Elements and Compounds are Pure Substances.
Examples of Elements:
Metals: Gold, Silver, Copper, Aluminium, Iron, etc.
Non-Metals: Carbon, Hydrogen, Oxygen, Nitrogen, Sulphur, Chlorine, etc.
Metalloids: Boron, Silicon, Arsenic, Germanium
Noble Gases: Helium, Neon, Argon, Krypton, Xenon and Radon
Examples of Compounds:
Inorganic Compounds: Demineralized water, Salt (NaCl)
Organic Compounds: Sugar, Alcohol, Proteins, Vinegar

Impure Substances are made up of Two or more pure substances mixed together in any ratio.
They retain the properties of constituent substances.
The bulk composition of Impure substances is not uniform. They may be homogeneous or heterogeneous mixtures.
They do not have definite set of properties such as density, boiling point and melting point.
Examples:
Homogeneous Mixtures: Tap Water, Milk, Honey, Fruit Juice, Bronze, Brass, Sugar syrup
Heterogeneous Mixtures: Oil and water, sand and water, sand and salt, sand and iron fillings

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