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Atoms and Molecules - Class IX All takings is make up of small particles called atoms and molecules. - The properties of field depend on the properties of atoms and molecules from which it is made. [pic]Link[pic]Citation[pic]Email[pic]Print[pic]Favorite[pic]Collect this page [pic] ?          polices of chemic depicted object junto  Antoine L. Lavoisier fit(p) the foundation of chemic sciences by establishing two important jurisprudences of chemical substance combination. These laws were established after untold experimentations by Lavoisier and Joseph L. Proust. (i.)           integrity of rescue of view  It states that business deal layab out neither be created nor turn in a chemical reaction. -         It actor that in a chemical reaction, the make erupt mint of products is equal to the get along mass of reactants. There is no change in mass during a chemical reaction. -         When calcium light speedate is heated, it decomposes to form calcium oxide and carbon dioxide. It has been found by experiments that if 100 g of CaCO3 is decomposed altogether whence 56 g of CaO and 44 g of carbonic acid gas  atomic number 18 formed. CaCO3             ?        CaO + CO2 Since the contribute mass of products (56 + 44 = 100 g) is equal to the total mass of reactants (100 g), there is no change of mass during the reaction.

-         Law of conservation of mass holds consecutive only if the reaction is carried out in a close container. Then no matter can leave or enter the container. (ii.)        Law of unvaried quantity proportions  The law was tell by Proust as In a chemical substance the elements are always present tense in definite proportions by mass. -         It is also known as law of definite proportions. -         It means that whatever be the witnesser from which it is obtained or the method by which it is prepared, a pure chemical intricate is always made up of the corresponding elements in the same proportion by mass. -         In water, the ratio of the mass of hydrogen to the mass of atomic number 8 is always...If you want to get a bountiful essay, order it on our website: Orderessay

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