Guide
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Latin name of arsenic - Arsenicum - derived from the Greek word arsen, which means strong, courageous.Perhaps the name given to the element due to its strong influence on the human body.
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physical properties of arsenic
This element can be represented by several allotropic modifications, the most stable of which is gray (metallic) arsenic.He is represented by fragile metallic mass having the open fracture characteristic metallic sheen and quickly tarnishes in moist air.At atmospheric pressure and a temperature of 615 degrees produced arsenic vapor (sublimation occurs), which, when cooling the surface of the liquid air condenses and forms a yellow arsenic.This modification is represented as soft as wax, transparent crystals, which when exposed to light and heat a small pass again into the gray arsenic.Also known brown and black modifying element (steklov
ido-amorphous).When vapor deposition of arsenic is formed on the glass mirror film.Although arsenic is largely a nonmetal, its electrical conductivity decreases with increasing temperature, as in any typical metal.
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Chemical properties of arsenic Arsenic
- is acid-forming element, but the salts, for example, sulfuric acid does not produce, so it is often seen as a semimetal.In the initial form of the element sufficiently inert, it will not impact the water, alkalis and acids having no oxidizing properties.Upon reaction with dilute nitric acid, it is oxidized to form ortomyshyakovistoy acid and concentrated to give ortomyshyakovuyu acid.The interaction of arsenic and arsenides active metals are formed (salt-like compounds) that are subject to hydrolysis by water.In an acidic environment, this reaction is particularly fast and arsine is formed - this is a very toxic gas, which in itself has no color or smell, but by the content of impurities there is a smell of garlic.Decomposition of arsine to the elements already starts at ambient temperature and is sharply accelerated by heating.When the pair sublimation of arsenic in the air quickly burn with a blue flame, resulting in formation of a pair of heavy white arsenic anhydride, which is the most common arsenic-containing reactant.