Ultimate Class 9 Chemistry Notes: 4-in-1 Mastery Pack
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Course
Chemistry
Institution
Third Year / 9th Grade
Ace Chemistry with This All-in-One Notes Package!
Struggling to keep up with Chemistry? This Comprehensive Class 9 Chemistry Notes Package is your perfect study companion! Covering the 4 critical lessons — Matter, Is Matter Pure?, Atoms & Molecules, and Structure of Atoms — these notes provide...
Elements Compounds Homogeneous Heterogeneous
cannot be broke have fixed uniform non-uniform
into simpler composition can composition composition
substances be broken down
into elements
E.g. copper, E.g. water, sugar, E.g. sugar + HO,
2 E.g. sand + sugar,
oxygen, hydrogen salt, etc. water + alcohol. water + oil,.
Elements
It is a pure substance which cannot be split into two or more simpler substances.
Metals Metalloids Non-metals
malleable, shows some non-malleable,
ductile, good properties of metals non-ductile
conductors of heat and some of non-metals bad conductors of heat
E.g., copper, gold, E.g., silicon, boron, E.g., sulphur, oxygen
iron arsenic
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.
• 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:
• 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.
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