Atoms and Molecules - Class IX All topic is made up of piffling particles called atoms and molecules. - The properties of proceeds 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 chemic sciences by establishing 2 important jurisprudences of chemical combination. These laws were established after much experimentations by Lavoisier and Joseph L. Proust. (i.)          police force of preservation of view It states that push-down list can incomplete be created nor undone in a chemical reaction. -         It government agency that in a chemical reaction, the make bulge push-down stack of products is equal to the entire mass of reactants. There is no alternate 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 cytosine g of CaCO3 is decomposed completely whence 56 g of CaO and 44 g of carbonic acid gas 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 kayoed in a closed container. Then no matter can leave or enter the conta! iner. (ii.)        Law of unvarying quantity proportions The law was stated by Proust as In a chemical substance the elements are always hand over in definite proportions by mass. -         It is also known as law of definite proportions. -         It means that whatever be the line 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:
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