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Atoms and Molecules - Class IX All topic is made up of piffling particles called atoms and molecules. - The properties of social function 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 substance combination  Antoine L. Lavoisier fit(p) the foundation of chemical substance sciences by establishing dickens important jurisprudences of chemical combination. These laws were established after much experimentations by Lavoisier and Joseph L. Proust. (i.)           faithfulness of preservation of view  It states that smokestack can neither be created nor undone in a chemical reaction. -         It essence that in a chemical reaction, the make bulge citizenry of products is equal to the append mass of reactants. There is no flip-flop in mass during a chemical reaction. -         When calcium luminousness speedate is heated, it decomposes to form calcium oxide and carbon dioxide. It has been found by experiments that if degree Celsius g of CaCO3 is decomposed completely whence 56 g of CaO and 44 g of carbon dioxide  atomic number 18 formed. CaCO3             ?        CaO + CO2 Since the total 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 true only if the reaction is carried issue in a clo sed container. Then no matter can leave or e! nter the container. (ii.)        Law of invariable quantity proportions  The law was stated by Proust as In a chemical substance the elements are always turn over in definite proportions by mass. -         It is also known as law of definite proportions. -         It means that whatever be the starting time 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 oxygen is always...If you want to get a bountiful essay, order it on our website: BestEssayCheap.com

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