Is Matter Around Us Pure – CBSE Notes for Class 9 Science
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Facts that Matter
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• Compounds
Compound is a pure substance made up of two or more elements combined chemically in a definite ratio.
Characteristics:
1. The properties of compound differ from those of its constituents.
2. Compound has fixed melting point and boiling point.
3. Compound is a homogeneous substance.
4. 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 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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