important chemistry facts

(CaSO 4 ) 2 .H 2 O Gypsum Calcium sulphate dihydrate CaSO 4 .2H 2 O Dead burnt plaster Calcium sulphate anhydrous CaSO 4 Lime stone Calcium carbonate CaCO 3 Some of the important compounds of sodium and calcium were discussed in this chapter. It may be und..

Origin of Organic Chemistry - Carbon compounds are of two types: inorganic and organic. The compounds that have a mineral origin fall under the category of inorganic compounds. The compounds having plant or animal origin are classified as organic compounds. Lavoisier showed that nearly al..

Carbon in Nature - Carbon is an extremely important element and was known from the earliest times in the form of charcoal, soot, etc. Although the amount of carbon in the earth's crust is only eleventh by mass, it ranks as high as oxygen and hydrogen, in importance. In nature, i..

Oxides of Sulphur - Two of the important oxides of sulphur are sulphur dioxide and sulphur trioxide. Sulphur dioxide is formed by burning sulphur in air or roasting metal sulphides in the presence of air. A large amount of SO 2 gas is released into the atmosphere from coal and oil based p..

Aufbau Principle - The Aufbau principle states that in the ground state of an atom, an electron enters the orbital of lowest energy first, and then the subsequent electrons are fed in the order of increasing energies into the orbitals. The relative energies of various orbitals are given in fig.1.6...

Maxwell's Distribution of Molecular Speeds - On plotting a fraction of molecules having different speeds against the speeds of the molecules (along x-axis) a curve known as Maxwell's distribution curve is obtained. The important features of which are: The fraction of molecules with very l..

. The reluctance of silicon to form p p -p p bonds to itself is clearly shown by the following facts: that (i) elemental silicon exists only in tile diamond structure and no form of elemental silicon is comparable to graphite and (ii) while CO 2 is a gas with two carbon oxygen double bond..

Element Symbol Group Number Potassium K 1 Sodium Na 1 Lithium Li 1 Calcium Ca 2 Magnesium Mg 2 Aluminium Al 3 Carbon C 4 (Non - Metal) Zinc Zn Transition Metal Iron Fe Transition Metal Tin Sn 4 Lead Pb 4 Hydrogen H Non - Metal C..

) are as far apart as possible -180. This is called the anti conformation. As rotation around the C2-C3 bond occurs, an eclipsed conformation is reached in which there are two methyl-hydrogen interactions and one hydrogen-hydrogen interaction. This eclipsed conformation is more strained than the an..

The branch of science, which deals with the study of matter, its composition, its properties and the changes that it undergoes in composition as well as in energy during various processes, is defined as chemistry. It has been further divided into different branches depending upon speciali..