Published May 06, 2017
The wolfram is a chemical element with atomic number 74 in the periodic table of chemical elements, denoted by W. Wolfram is the most refractory metal. Higher melting temperature has only a non-metallic element - carbon. Under normal conditions, chemically resistant....
Published May 06, 2017
Iron bacteria are associated with the origin of deposits of ironstone. For its existence, iron bacteria use the energy that is released in their cells through oxidation, dissolved in water, ferrous compounds...
Published May 06, 2017
H2SO4 is a strong dibasic acid, corresponding to the highest degree of sulfur oxidation (+6). Under normal conditions, the concentrated sulfuric acid - heavy, oily liquid is colorless and odorless. If the molar ratio of SO3:H2O <1, it is an aqueous solution of sulfuric acid if > 1 - a solution of SO3 in sulfuric acid (oleum)...
Published May 06, 2017
Zinc under normal conditions is fragile transition metal of bluish white color (tarnishes in air, becoming covered with a thin oxide layer). For a long time it was not possible to allocate it in a pure form. In 1738 in England by William Champion was patented distillation method for the preparation of zinc...
Published May 06, 2017
Iodine is found in the Earth's crust in very small amounts - 3*10-5% of the mass, and in addition, iodine is spray element. Reactive nonmetal refers to a halogen group. Because of its ubiquity, this element is literally everywhere. Fersman wrote about it this way: "...Everything is impregnated with iodine - the solid earth and rock... much more of it in the sea water a lot of iodine in the soil...
Published May 06, 2017
Plutonium is heavy radioactive metal brittle silver-white color, but oxidize in air, changing its color at first bronze, then blue tempered metal and after turning into a dull black or green color because of the formation of loose oxide coating. In nature, it is preferably in the form of dioxide (PuO2), which is even less water soluble than the sand...
