Question

State the following laws of chemical combination with example : 1. Law of constant composition 2. Law of multiple parpotion

Answer 1

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♦ Law's of Chemical Combination ♦


1.) Law of Constant Composition .

=> Analyzed by = Scientist - ' Proust ' in 1779 .

also called Law of Constant Propotion .

According to this Law a chemical compound always consist of same elements combined together in same proportion by mass

eg.) => most common example = Water .

=> Water is compound pf hydrogen and oxygen . Any water molecule is always found in the composition of two hydrogen atoms and one oxygen atom in a fixed ratio .


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2.) Law of Multiple Proportion .

given by => ' John Dalton ' in 1808


=> According to this law when an element combines with another to form a compound then the ratio comes to be simple ratio .

simple ratio means that => 1 : 1 ,, 1 : 3 ,, 1 : 2 .

eg.) => let us take an example of CO ,CO2

=> in CO there is 12 g Carbon combined with 16 g of oxygen .

and in CO2 12 g of oxygen combines with 32 g of oxygen .

So , here we can see that the mass of oxygen that is combined with constant mass of carbon has a simple ratio = 16 : 32 => 1 : 2 .




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