Atoms and Molecules short 1
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Who came up with the name of atoms ?
Democritus
Who laid the foundation for chemical sciences ?
Antoine L. Lavoisier
What are the laws established by Lavoisier and Joseph L. Proust
1] Law of conservation of mass 2] Law of constant proportions
What is the ratio of the mass of hydrogen to the mass of oxygen in water ?
1:8
What is the ratio of the mass of nitrogen to the mass of hydrogen in ammonia ?
14:3
The law of constant proportions is also known as
Law of definite proportions
What is the law of constant proportions ?
In a chemical substance the elements are always present in definite proportions by mass.
What are Atoms ?
The building blocks of all matter are atoms.
Who suggested that the symbols of elements be made from one or two letters of the name of the element ?
Berzilius
Full form of IUPAC ?
International Union of Pure and Applied Chemistry
Name some of the elements whose name has been taken from other languages ?
1] Iron-fe [ferrum] 2] Sodium-Na [Natrium] 3] Potassium-K [Kalium]
What is Molecular mass of a substance ?
It is the sum of the atomic masses of all the atoms in a molecule of the substance.