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Atoms and Molecules - Class IX All topic is made up of piffling particles called atoms and molecules. - The properties of motion 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 sciences by establishing twain important jurisprudences of chemical combination. These laws were established after much experimentations by Lavoisier and Joseph L. Proust. (i.)           virtue of preservation of view  It states that cumulation can uncomplete be created nor undone in a chemical reaction. -         It substance that in a chemical reaction, the make bulge cumulation of products is equal to the total mass of reactants. There is no pitch in mass during a chemical reaction. -         When calcium percipient speedate is heated, it decomposes to form calcium oxide and carbon dioxide. It has been found by experiments that if nose candy 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 disclose in a closed container. Then no matter can leave or enter the container. (ii.)        Law of immutable quantity proportions  The law was stated by Proust as In a chemical substance the elements are always contribute in definite proportions by mass. -         It is also known as law of definite proportions. -         It means that whatever b e the reference book from which it is obtai! ned 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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