Chapter 2 Is Matter Around Us Pure

Facts that Matter

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matter-around-us-pure-cbse-notes-class-9-science-2Compounds

The compound is a pure substancemade up of two or more elements combined chemically in a definite ratio

Characteristics:
  • The properties of compound differ from those of its constituents.
  • Compound has fixed melting point and boiling point.
  • Compound is a homogeneous substance.
  • Constituent elements can be separated by chemical process.
Mixtures
It is made up of two or more elements or compounds mixed in any ratio/proportion.

Properties:
  • It may be homogeneous or heterogeneous.
  • The properties of constituent substances are retained.
  • No new compound is formed.
  • Elements can be separated by simple physical processes.
  • It does not have a fixed melting and boiling point.
Separation of Mixtures:
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Physical and Chemical Change
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Solution
It is a homogeneous mixture of two or more substances.

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Different Types of Colloids
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