Copper Bathroom Mirrors

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Copper Bathroom Mirrors

Chemical element with atomic number 50 and symbol Sn. It is a silvery metal, malleable, which is not easily oxidized in air and resists corrosion. Is found in many alloys and is used to coat other metals to protect them from corrosion. Tin is mainly obtained from the ore cassiterite where it occurs as an oxide. Tin is a metal ductile, malleable (to 200 ° C that becomes "sour" and miss this feature) and polish that can be rolled easily for tinfoil. Argentina is white and fold it emits a sound called a "cry of tin" because of the broken glass. It has good corrosion resistance to acids-moderate, bases and acid salts, compared to seawater and air, and resists the action of dairy products, juices and so fuel is used for soldering of steel packaging (tin). Heated in the presence of air forms Sn2, slightly acidic, which is in turn stannates with basic oxides. The metal reacts with chlorine and oxygen and displaces hydrogen in dilute acids. Tin has two allotropic forms, ? tin (gray) metallic powder, semiconductor, cubic structure, stable at temperatures below 13. 2 º C, and tin ? (white), the normal metallic conductor, structure tetragonal and stable at temperatures above 13. 2 ° C. Tin ? with a structure similar to that of diamond is very fragile and has a specific gravity lower than the white form so the allotropic transformation ? ? ? is verified with a significant volume reduction. The reverse transformation takes place spontaneously at temperatures below the transition causing what is called "tin pest" appreciable staining in the white tin gray brittle to the touch and spread around the room as it happens transformation ultimately reducing dust. The transformation is affected by the presence of impurities (aluminum and zinc) can be prevented by the addition of antimony or bismuth. The tin is superconducting below 3. 72 K. In fact, one of the first study and in superconducting tin crystals were first discovered the Meissner effect. Tin is used in the steel liner to protect it from corrosion. Tin, tinned steel, remains an important material for canning and destination of about half the tin metal produced in the world but is being replaced by aluminum. The second application in importance is the soldering pipes and electrical and electronic circuits. Pilkington float process for the manufacture of glass in this fleet during the slow solificación on a bed of molten tin. The compound of niobium-tin, Nb3Sn is used commercially to manufacture wires for superconducting magnets for its high critical temperature (18 K) and critical magnetic field (25 T), which allows devices to replace conventional weighing several tons per magnets a couple of kilograms. Tin, Latin stannum is a metal known since ancient times. Taking advantage of its ability to harden copper, was already in use in the manufacture of bronze to 3500 BC. Tin mining is believed that began in Cornwall and Devon (England) where he obtained though the Romans and Greeks and Phoenicians traded with the East. Still, the pure metal was not used until 600 BC. Tin salts, in particular, tin II chloride is used to make copper bathroom mirrors and to sensitize non-conductive surfaces will be conducting later for printed circuit boards. The most important salt is chloride of tin (II) (stannous) used as reducing agent and a mordant in dyeing of cotton and wool and various analytical procedures, for example, the amount of mercury in the urine. It is the chemical element known more stable isotopes, ten. In addition, 15 states have carcterizado metastable and thirty radioisotopes. The "hair of tin," as well as zinc, that constitutes a danger to the integrity of electronic equipment to the extent that can cause short circuits especially if currents used are small (. .
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