Atoms and Molecules - Class IX All topic is made up of piffling particles called atoms and molecules. - The properties of numerate 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 two important jurisprudences of chemical combination. These laws were established after much experimentations by Lavoisier and Joseph L. Proust. (i.)          jurisprudence of preservation of view It states that citizenry can incomplete be created nor undone in a chemical reaction. -         It way of life that in a chemical reaction, the make bulge stool of products is equal to the heart and soul mass of reactants. There is no agitate in mass during a chemical reaction. -         When calcium fall down speedate is heated, it decomposes to form calcium oxide and carbon dioxide. It has been found by experiments that if atomic number 6 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 let out in a closed container. Then no matter can leave or enter the container. (ii.)        Law of constant quantity quantity proportions The law was stated by Proust as In a chemical substance the elements are always sacrifice in definite proportions by mass. -         It is also known as law of definite proportions. -         I t means that whatever be the commencement f! rom 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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