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What is the proportion of chromium?

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Properties of Chromium and Its Compounds

1. element: chromiumThe density is 7.22g/cm3,Titanium MetalThe density is 4.51g/cm3, the density of copper is 8.9(g/cm3), and the density of iron is 7.85(g/cm3)

1. Physical Properties Chromium is a silvery white metal, refractory (melting point 1800 C), specific gravity 7.1, similar to iron. Chromium is the hardest metal!

The chemical properties of chromium is very stable, at room temperature, placed in the air or immersed in water, will not rust. The shell of the watch is often shiny silver, people say

It is plated with "Crome", a total of real, "Crome" is chrome, is the Latin name from the roadChromium transliterated.

1The metal shelves, watchbands, car lights, bicycle handlebars and rims, iron railings, camera shelves, etc. of some glasses are also often plated with a layer of chrome, which is not only beautiful,

And rust-proof. The thinner the chromium layer is, the more it will stick to the surface of the metal and will not be easy to take off. On the inner wall of some barrels and barrels, the chromium layer plated is only 0.005

Millimeters thick, but after thousands of shells and bullets were fired, the chrome layer was still there.

Colorful. The original Greek meaning of chromium is "color". Metal chromium is white and silver bright, chromium sulfate is green, magnesium chromate is yellowColor, potassium dichromate is orange, chromic acid is scarlet, chromium oxide is green(Common green pigment "chrome green" is it),

Chromium (aqueous chromium sulfate) is blue-purple, lead chromate is yellow (common yellow "chrome yellow" is it)

2. Chemical properties of chromium

Inactive metal, which is stable to oxygen and moisture at room temperature, but reacts with fluorine to formCrF3. Metal chromium in acid generally to the surface bluntinto its characteristics. Once passivated, it is highly soluble in almost all mineral acids, but insoluble in nitric acid. At high temperatures, chromium reacts with nitrogen and is invaded by alkali.Erosion. Soluble in strong alkali solution. Chromium has a high corrosion resistance, in the air, even in the red hot state, the oxidation is very slow. Insoluble in water. Plated in goldThe genus can play a protective role.

When the temperature is higher than 600C, chromium and water, nitrogen, carbon and sulfur react to form the correspondingCrzQ, 62N and CrN, C ^ G and Cr3C2,C "$. Chromium andThe oxygen reaction starts faster, and the speed slows down sharply when the surface generates an oxide film. When heated to 1200C, the oxide film is destroyed and the oxidation speed is accelerated again,By 2000C, chromium is burned in oxygen to produce CrzQ. Chromium easily and dilute hydrochloric acid or dilute sulfuric acid reaction, the formation of chloride or sulfate, while the release of hydrogen.The relevant chemical equation is as follows: Cr 2HCl = CrCl 2 H 2 f Cr H 2SO = CrSO 4 H 2?

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