make notes of ten main points of the chapter :- is matter around us pure Class 9
Answers
Answer:
Facts that Matter
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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:
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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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