Chromium re
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Chromium is a transition metal found in rocks, soil, plants and animals in several forms. It has many uses including making steel, alloys, dyes, and preventing corrosion. Chromium is also essential in small amounts in our diet for protein and fat metabolism. Chromium was discovered in 1780 by a French chemist who isolated it from a mineral sample. It is compatible with acids but should avoid basic solutions. Chromium has a silvery appearance and forms a protective oxide coating when exposed to air.
Chromium re
- 1. Chromiumisfoundinnature!Itspresenteverywhere.Chromiumcanbe foundin3 forms,metal ore,trivalentchromium,andhexavalentchromium.Itisfoundinrocks,soil,plants,andanimals. Chromiumhasmanydifferentuses,one of themisforitscolorcompounds, it’sbeenusedtomake dyes and pigmentsforpaints,andtomake bricksin furnaces,tanleather,andpreserve wood.Chromiumis alsousedto make steel andotheralloys,forchrome plating,andasan additive tolimitcorrosion.The trivalentformof chromiumisactuallyanessential nutrientinourdiet,itsneededformanyimportant functions,proteinandfatmetabolismare just2 greatexamples. In 1780 chromiumwasdiscovered,aFrenchchemistnamedNicholasLouisVauquelin discoveredit.It wasdiscoveredinParis,Nicolasdiscoveredchromiuminamineral sample of Siberian redlead,thisisnow knownascrocoite (leadchromate). Nicolasboiledthe crushedmineral with potassiumcarbonite toproduce leadcarbonate anda yellow potassiumsalt solutionof chromaticacid, he thenknewhe had founda newmetal aftermore experiments.In1781, he isolatedthe metal with success. Chromiumisingroup 6 , and period4, chromiumisinthe transitionmetal family.Sowhatother chemicalsdoeschromium commonlyreactwith?Well,chromiumiscompatiblewithHCI,HNO3,H2SO4, HF, H3PO4, these are stable.However,chromiumshouldavoidbasicmedia.chromiumisbasicallystable withmostmetalsandinorganicanionsinacidicmedia. Chromiumissilverandlustrous.Chromiumisaveryhard metal,itcan also take a highmirror polish.Chromiumisodorless,tastelassandmalleable.Chromiumformsathincoatingthatis actually protective oxideinthe air.Chromiumactuallyburnsif heated,itthentakesformas greenchromium oxide. Chromium’sabundance onEarth’scrustis 102 partsper millionbyweight,and40 parts per millionbymoles.Chromium’sabundance inthe solarsystemis20 partsper millionbyweight,.4parts permillionbymoles.The costforpure chromiumis$32 per100g. the cost of chromiuminbulkis actually$.28 per100g. Chromiummay not be foundas a free elementinnature,butitisfoundinthe formof ores.