Question

DALTON ATOMIC THEORY..
And LAW OF CONSERVATION OF MASS.

WELL EXPLAINED

Answer 1

Dalton atomic theory
states that

atom is indestructible

it is the smallest unit of an element

it is indivisible

atoms of an element are of same kind
__________________

law of conservation of mass

this law states that

the mass of the reactants in a reaction

is equal to the mass of product form

FOR example
ZnCl+H2SO4==>ZnSO4+H2

in this reaction mass of reactants is equal to mass of product

Answer 2

Hey friend here is your answer......

Dalton's Theory :

The theories of kanad as well as of Democritus and Leukiposs remained forgotten for more than 2000 years . But when experimental Chemistry develop, it became necessary to explain observed facts . in 1803, english chemist John Dalton put forward his atomic theory , which can be summarised as follows .

1. elements are made up of very small particles of matter, called items ( derived from the Greek word or atomos ) .

2. Atoms are indivisible .

3. The atoms of an element have the same weight.

4. The atoms of different elements have different weights.

5. It is the atoms of elements that take part in a chemical reaction.

6. The atoms of an element combine in a simple numerical ratio with those of other elements to form a compound.

Law of conservation of mass :

Lavoisier , in the late 18th century, gave a law , called the law of conservation of mass , which can be stated as follows .

Matter can neither be created nor destroyed but can changed from one form to another and the total mass of the substances before and after that changed remains the same .

The law of conservation of mass is true for physical as well as chemical changes . In a nutshell, the total mass of the substances before and after the change is the same.

Eg : Put a small tube or bottle containing a solution of Barium Chloride into a conical flask . Place some sodium sulphate solution in the class with the help of a dropper carefully , ensuring that the two substances do not come in contact with each other . Close the mouth of the flask with the cork and weigh the flask . Tilt the flask and swell it slowly. A white precipitate is formed . Leave the flask for sometime and weigh it again.  You will find that there is no change in the weight of the flask .

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