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
