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SAI International School
                                                   Lesson Notes

                                                Subject-Chemistry
                                            Ch-Atoms and Molecules
                 Topic-Mind map and introduction, Laws of Chemical Combination

                                                  LESSON NOTE











































               Laws of Chemical Combination:

               The process of combination of two or more elements to form new compounds is
               governed by certain laws called laws of chemical combination. These are:


               1.  Law of conservation of mass (by Lavoisier in 1744):

               2. Law of constant proportions (by Proust in 1797):

               Law of conservation of mass


               •       According to the law of conservation of mass, matter can neither be created
               nor destroyed in a chemical reaction. It remains conserved.

                Or, in a chemical reaction the mass of reactants will be equal to the mass of
               products.



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