ten importance of chemistry iii

Vitamin A This is a fat soluble vitamin which is present mostly in animals. Its provitamins carotenes are found in plants. Vitamin A is necessary for vision and proper growth. It is necessary for maintenance of proper immune system to fight various infections. Cholesterol synthesis req..

The measurement of dipole moment helps in distinguishing between polar and non-polar molecules. Non-polar molecules have zero dipole moment while polar molecules have some value of dipole moment. For example: Non-polar molecules: O 2 , Cl 2 , BF 3 , CH 4 Polar Molecules: HF (1.91 D), ..

Element Symbol Atomic number Electronic configuration (or Electron arrangement) KLMN Hydrogen H 1 1 Helium He 2 2 Lithium Li 3 2,1 Beryllium Be 4 2,2 Boron B 5 2,3 Carbon C 6 2,4 Nitrogen N 7 2..

. They consist of metals. 7. The Zero group consists of 'Noble gases'. 8. There are 7 horizontal rows in the periodic table. These are called the periods. 9. In a period, the number of valence shell remains the same for all elements. However, the number of electrons in the valence shell increases f..

Another important synthetic rubber is thiokol. It is a polymer of ethylene polysulphide. It can be prepared by the condensation of 1,2-dichloroethane with sodium polysulphid..

Important relationships * 1 mole of an atom = 1 gram atomic weight of an atom * 1 mole of a molecule = 1 gram molecular weight of molecu..

Oxygen (or dioxygen) has the following physical properties. Oxygen is colorless, odorless and a tasteless diatomic gas under normal conditions. Oxygen is slightly heavier than air. Its density relative to air is 1.1053. Oxygen is sparingly soluble in water. 30 mL of oxygen in one liter of ..

Borax is a colorless, crystalline solid sparingly soluble in cold water but dissolves readily in hot water. It forms two important hydrates: octahedral borax Na 2 B 4 O 7 .5H 2 O and monoclinic borax Na 2 B 4 O 7 .10H 2 ..

The importance of the above reactions lies in the production of nitric acid, which is a very important industrial produc..

The given problem is solved in the following table. Empirical formula = MgSO 1 1 H 1 4 Empirical formula mass = (24 x 1) + (32 x 1) + (16 x 11) + (1 x 14) = 24 + 32 + 176 + 14 = 246 Molecular mass = 246 Hence, Molecular form..