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SAI International School
Class-IX
Subject- Chemistry

Topic-Atoms and molecules
Concept Map
Lesson Note

Concept Mapping
 Laws of Chemical combinations  Law of conservation of mass
 Law of definite proportion

 Dalton’s atomic theory  Postulates of Dalton’s atomic
theory.
 Drawbacks of Dalton’s atomic
theory.

 Symbols of elements  Symbols of elements.
 Symbols of elements derived
from the first letter of their
names.
 Symbols of elements derived
from the first letter of their
names.
 Symbols of elements derived
from first letter and any other
prominent letter of their names.
 Symbols of elements derived
from their Latin names.

 Atomic and relative atomic masses  Concept of atomic masses

 Relative atomic mass.
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 Reasons for choosing C for
relative atomic masses.
 Relative molecular masses.
 Mole concept
 Conversion of mass into moles
and vice versa.
 Conversion of moles into number
of particles and vice versa.

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