Question

explain laws of chemical combination plz no spam

Answer 1

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

Explanation:

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Answer 2

Answer:

There are 5 laws of chemical combinations

1) Law of conservation of mass

proposed by Antoine Lavoisier.

In a chemical reaction the total mass of reactant always equal to total mass of product

OR

Mass is neither be created nor be destroyed

eg:- C+O2---CO2

total mass of reactant 44 g

total mass of product 44 g

2) Law of definite proportion

proposed by Joseph Proust

same compounds always contain same elements in a fixed ratio by mass

eg:- irrespective source of water it always contain hydrogen and oxygen in 1:8 fixed mass of ratio

3) Law of multiple proportion

proposed by John Dalton

when two different elements combined to form more than one compound, then one of the element that combined with fixed mass of another bears a simple ratio in mass

4) Gay Lussac law of Gaseous volume

proposed by Gay Lussac

At constant temperature and pressure when gaseous reactants combined to form gaseous product then there exists a simple ratio between their volumes

5) Avagadro's law

proposed by Avagadro

At constant temperature and pressure, equal volume of any gas have equal number of molecules(moles)