State the laws of chemical combination.
Answers
Answer:
Laws Of Chemical Combination For Elements And Compounds
In simple terms, this law states that matter can neither be created nor destroyed. In other words, the total mass, that is, the sum of the mass of reacting mixture and the products formed remains constant
Explanation:
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Answer:
Law of Chemical Combination
(1) Law of Conservation of Mass
In a chemical change, total mass remains conserved. i.e. mass before the reaction is equal to mass after the reaction
H
2
(g)+Cl
2
(g)⟶2HCl
Mass before reaction=2+71=73g
Mass after reaction=2x36.5=73g
(2) Law of constant or Definite Proportions
All Chemical compounds are found to have constant composition irrespective of their method of preparation or source.
For g. in water (H
2
O), hydrogen and oxygen combine in 2:1 molar ratio, this ratio remains constant whether it is tap water or river water.
(3) Law of Multiple Proportions
When one element combines with the other elements to form two or more different compounds, the mass of one element which combines with a constant mass of the other, bear a simple ratio to one another.
For eg. C and O
2
reacts together to form CO and CO
2
. Here, fixed mass of carbon (12g) reacting with different masses of oxygen (16g and 32g) . Therefore, ratio of the masses of oxygen has ratio 16:32 or 1:2