pls give me notes on class 9 of science chapter 3(NCERT)
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Law of Chemical Combination
Given by Lavoisier and Joseph L. Proust as follows:
1. Law of conservation of mass: Mass can neither be created nor destroyed in a chemical reaction. e.g., A + B → C + D Reactants → Products Mass of reactants = Mass of products
2. Law of constant proportion: In a chemical substance the elements are always present in definite proportions by mass.
E.g., in water, the ratio of the mass of hydrogen to the mass of oxygen is always 1 : 8 respectively.
These laws lacked explanation. Hence, John Dalton gave his theory about the matter. He said that the smallest particle of matter is called ‘atom’.
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