Chemistry Class Notes PDF
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File Size: 9.30 MB
Language: English
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Some Important Points are:
Chemistry:-
Chemistry is the branch of science which deals with study of composition, structure, and properties of matter.
Chemistry is also called as the science of atoms and molecules.
Mixture:-
It contains two or more elements or compounds. It is of two types-
a) Homogeneous Mixture
b) Heterogeneous Mixture
Significant Figures:-
The total number of digits in a number plus one doubtful digit.
Molecular Mass:-
It is the average relative mass of molecules compared with an atom of C-12 isotope. It is the sum of atomic masses of all elements present in 1 molecule.
Example:
The molecular mass of CH4 = 1.008 * 4 + 12.001
= 16.043 μ
Molecular mass of C12H22O11 = 342 μ
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