CHEMISTRY
Fundamentals of Chemistry
- Law of Conservation of Mass:
Mass can neither be created nor destroyed. This means that in a
chemical reaction, there are the same number of atoms of each element in the
products as there were in the reactants.
- Law of Constant Composititon:
A given chemical compound always contains by weight the same elements in the
same proportion.
Note:- Many compounds do not obey this law e. g. ferrous
sulphide has variable composition and rarely has precise formula. Such
compounds are called non-stoichiometric or Berthollide compounds.
- Law of Mulitple Proportions:
When two elements A and B. combine to form more than one compound the massed
of element B, which combine with a fixed mass of element A, are in simple
numerical proportion to one another.
- Law of Reciprocal Proportion (or
equivalemt proportions):
The masses of two elements A and B which combine separately with a fixed
mass of element C are in a simple ratio to the mass ratio in which A and B
combine with each other.
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