chemical equation and reaction; class 10 ; 2023

 









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ATOM AND MOLECULE, class 9 notes

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  ATOM AND MOLECULE   The idea of divisibility of matter was considered around 500 BC india.   Maharishi Kanad (Indian philosopher) postulated that if we go on dividing matter ( padarth ) in smaller particle so that further division will not be possible. This smallest particle is known as pramadu .   Pakudha Katyayama (Indian philosopher): said that these particles normally exist in a combined form and form different forms of matter.   Democritus and Leucippus (Greek philosophers) according to them if we divide matter, a stage will come when particles obtained cannot be divided further. Democritus called these indivisible particles atoms (meaning indivisible).   ·          Antoine L. Lavoisier laid the foundation of chemical sciences   Law of Chemical Combination two laws is Given by Lavoisier and Joseph L. Proust as follows:   1.   Law of conservation of mass:  Mas...
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