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Encyclopedia > Chromium(III) oxide
Chromium(III) oxide
Other names Chromium sesquioxide
Chromia
Chrome green
Molecular formula Cr2O3
Molar mass 151.99 g/mol
CAS number [?-?-?]
Density 5.21 g/cm3
Solubility (water) Insoluble
Melting point 2435 °C
Boiling point approx. 4000 °C
Disclaimer and references

Chromium(III) oxide, also known as chromium sesquioxide or chromia, is one of four oxides of chromium, chemical formula Cr2O3. It is commonly called chrome green, when used as a pigment, producing a dull, opaque, olive-green color, however it was referred to as viridian when it was first discovered. Chromium oxide was first prepared by a secret process by the Parisian colormen Pannetier and Binet in 1838. Today it is manufactured from the mineral chromite mined in southern Africa, Asia, Turkey and Cuba. A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of an element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... A solvent is a liquid that dissolves a solid, liquid, or gaseous solute, resulting in a solution. ... Water is in dynamic equilibrium between the liquid and solid states at standard temperature and pressure. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... Boiling Point DVD cover featuring Takeshi Kitano. ... General Name, Symbol, Number chromium, Cr, 24 Chemical series transition metals Group, Period, Block 6, 4, d Appearance silvery metallic Atomic mass 51. ... Categories: Colors | Pigments | Stub ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... Chromite, iron magnesium chromium oxide: (Fe,Mg)Cr2O4, is an oxide mineral belonging to the spinel group. ...


It is an amphoteric oxide, dissolving in acids to give chromium(III) salts and in molton alkali to give chromites. In chemistry, salt is a term used for ionic compounds composed of positively charged cations and negatively charged anions, so that the product is neutral and without a net charge. ... Chromite, iron magnesium chromium oxide: (Fe,Mg)Cr2O4, is an oxide mineral belonging to the spinel group. ...


See also


  Results from FactBites:
 
oxide: Definition and Much More from Answers.com (1287 words)
Oxides of nonmetallic elements are volatile compounds in which a covalent bond joins the oxygen and the nonmetal; they react with water to form acids or with bases to form salts.
Oxides are characterized by a redistribution of electrons, in which the oxygen atoms have a net surplus of electrons and the other atoms a net lack.
The oxides of the chemical elements in their highest oxidation state are predictable and the chemical formula can be derived from the number of valence electrons for that element.
Surface Science Western (476 words)
X-ray photoelectron spectra of a number of chromium oxides and other compounds were studied under high spectral resolution conditions chosen to reduce the possibility of differential charging.
The splitting patterns produced were similar for all trivalent binary and ternary oxides and sulphides whose patterns closely reproduced the splitting predicted for the Cr (III) free ion by Gupta and Sen (GS).1,2 Fitting data for spectra with multiplet split peak structure is shown in Table 1.
In many cases, a thick zinc oxide was present at the surface and the use of the charge neutralizer was warranted.
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