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Dec 17, 2014



Nov 24, 2013

#### write the names and formula of any 20 compounds by combing acidic and basic radicals



Thanks satyanarayna .......

Dec 19, 2014

#### The technique to learn atomic masses of elements according to the periodic table?



The atomic mass is double the atomic numb...

Dec 15, 2014

#### All the important formulaes relating with mole concept



The following formulas are used in the calculations :
Number of moles (n) = Given number of particles (N) / Avogadro number (N
0

Feb 5, 2015



Ans: 1 m...

Nov 23, 2014



Oct 16, 2013

#### What are the uses or applications or examples of ISOBARS ?



Isobars of uranium were used in nuclear reactor.
Isobars of cobalt were used in treatment of cancer.
Isobar of iodine was used in treatment of goitre.

Feb 20, 2015

#### Calcium Carbonate (CaCO3) contains 40% calcium , 12% carbon and 48 % oxygen by mass . Knowing that the law of constant proportions holds good , calculate the mass of the constituent elements in 2g of calcium carbonate .



According to law of definite proportions, in a chemical substance, the elements a...

Nov 16, 2013

#### What is difference between 2N and N2



2N represents two atoms of nitrogen whereas N2 represents one molecule of nitrogen gas.