To convert a signed binary int to a decimal number, use the following algorithm. We illustrate the algorithm on two four-bit examples: 1110 and 0101. If the leftmost bit is a 1, the number is negative. Do the following... (1110 starts with a 1.
Copper pyrites is a common name for the mineral chalcopyrite, which has a formula CuFeS2. It can be considered to be made up of Cu+ Fe3+ S2- ions but there is covalent character.
Actually the compound ,blue vitriol is a hydrated crystalline substance ,so its formula is written as CuSO4.5H2O. and its chemically known as copper(II)sulphate pentahydrate. To know more click. http://antoine.frostburg.edu/chem/senese/101/inorganic/faq/blue-vitriol.shtml.