Law of Conservation of Mass

Law of Conservation is proposed by the French chemist A. Lavoisier in 1774.
Lavoisier is regarded as the father of chemistry.
He extremely studied a verity of chemical reaction and found that the total mass of product obtained in a chemical reaction is always the same as the total mass of reaction taken.

The law of Conservation of mass stated as follows:-

1) Atom is the smallest particle of matter which cannot exist in free state.

2) Atoms of a particular element may not be identical. The Atom of the same element may posses different relative mass.
Such species of an atom which possess different relative mass are called isotopes.

3) Atoms of one element may be similar to those of some other element in relative mass.
Such species of atoms of different elements having identical relative masses are called isobars.

4) Atoms is divisible and can be divided into subatomics particles like electrons, protons and neutrons. Besides these fundamental particles, several other particles are also found to exist in an atom.

5) Atom is destructible. The mass within an atom can be converted into energy according to the Einstein's equation E=mc×mc. The change of mass into energy is possible only in nuclear fission and nuclear fusion reaction. Therefore, in ordinary chemical reaction, Atoms are not destructible.

6) Atoms is still supposed to be the unit of a chemical reaction.

7) Atoms of different elements usually combine together in a fixed, simple, whole number ratio to form molecules. However, several compounds are known in whose molecules Atoms are not present in simple whole number ratio. Such compounds are known as non-stoichiometric compounds. In molecules, atoms are held together by different types of binding forces.

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