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Is Matter Around us Pure?

Tutormate > CBSE Syllabus-Class 9th Chemistry > Is Matter Around us Pure?

01 Pure Substances and Mixtures


  • A pure substance is one which is made up of only one kind of particles.
  • A pure substance is one which is made up of only one kind of atoms or molecules.
  • All the elements and compounds are pure substances because they contain only one kind of particles.
  • The elements like hydrogen, oxygen, nitrogen, chlorine.
  • All the compounds such as water (including ice and steam), carbon dioxide, sodium chloride, sugar, copper sulphate, alum.
  • A pure substance cannot be separated into other kinds of matter by any physical process.
  • A pure substance has a fixed composition as well as a fixed melting point and boiling point.


  • A mixture is the one which contains two or more different kinds of particles (atoms or molecules).
  • A mixture is a substance which consists of two or more elements or compounds neither loses its individuality nor is chemically combined together.
  • All the mixtures are impure substances because they contain more than one kind of elements and compounds.
  • The following are some examples of mixtures:
    • Seawater is a mixture of various salt and water.
    • Crude oil is a mixture of organic compounds (mainly hydrocarbons)
    • Gunpowder is a mixture of sulfur, potassium nitrate and carbon.
    • Ink is a mixture of coloured dyes.
    • Air is a mixture of various gases like oxygen, carbon dioxide, argon, neon, etc.
    • Some other examples of the mixtures are: salt solution, sugar solution, milk, sea-water, air, sugarcane juice.

General properties of mixtures:

Mixtures comprise two or more substances which are not chemically combined with each other. The properties of mixtures are as follows:

  • The components can be separated easily.
  • The proportion of the components is variable.
  • The components of a mixture each keep their original properties.

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