Is Matter Around Us Pure Class 9 Notes Science Chapter 2

CBSE Class 9 Science Notes Chapter 2 Is Matter Around Us Pure

Facts that Matter

Compounds
The compound is a pure substance made 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:

Physical and Chemical Change

Solution
It is a homogeneous mixture of two or more substances.

Different Types of Colloids

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