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chromite
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∙ 13y ago
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What is the formula of natural chromite?
feCr2O4
What are some compounds chromium is found in?
Chromium chlorides, Chromite (FeCr2O4), and Chromium oxide (Cr2O3).
What is the percent of oxygen by mass in a pure sample of FeCr2O4?
To determine the percentage of oxygen in FeCr2O4, you would first calculate the molar mass of the compound (iron(II) chromite) using the atomic masses of each element (Fe = 55.85 g/mol, Cr = 51.996 g/mol, O = 16 g/mol). Then, calculate the molar mass percentages of each element within the compound, and finally, determine the percentage of oxygen by mass in the compound.
What is the standard state of chromium?
The natural state of the element chromium is a solid metal. The natural state just indicates what the element is.
What is the empirical formula of a mineral having the percent composition 28.59 O 24.95 Fe 46.46 Cr.?
O: 28.59 g x 1 mole O/16 g = 1.79 moles OFe: 24.95 g x 1 mole/55.8 g = 0.447 moles FeCr: 46.46 g x 1 mole/52 g = 0.893 moles CrDividing through by 0.447 one gets 4O, 1Fe and 2CrEmpirical formula = FeCr2O4
Which of the following metals in not extracted from the earth using metallurgy a Copper b Iron c Chromium d None of the above?
ALL OF THEM ARE EXTRACTED FROM EARTH IN THE FORM OF ORES. IRON IS EXTRACTED IN THE FORM OF:- HAEMATITE, Fe2O3 LIMONITE,2Fe2O3.3H2O MAGNETITE, Fe3O4 IRON PYRITE, FeS2 COPPER IS EXTRACTED IN THE FORM OF:- CHALCOPYRITE, CuFeS2 COPPER GLANCE, CuS CHALCOCITE, Cu2S MALACHITE, CuCO3.Cu(OH)2 CUPRITE, Cu2O CHROMIUM IS EXTRACTED IN THE FORM OF:- CHROMITE, FeCr2O4
Where can chromium be found?
chromite is usually found in the earth from volcanoes or lava that form around the earths crustAnd India, Pakistan, Montana, Finland, Ontario.
What food sources are in chromium?
Concentrated foods sources of chromium include brewer's yeast, corn, wheat bran, sweet potatoes, apples, rye bread, onions, potatoes, tomatoes, wheat germ, buckwheat, green pepper, bran cereals, parsnips, cornmeal, broccoli, spinach, banana, and puffed rice cereal. Many people do not get enough chromium in their diet due to food processing methods that remove the naturally occuring chromium in commonly consumed foods. Beer and wine can accumulate chromium during fermentation and are therefore considered to be dietary sources of the mineral.
What are the different groups of minerals?
IMPORTANT!READ ALL INFORMATION FIRST!Elements: Many pure elements are found in the form of minerals in ores or mines. For example, uncombined carbon is often found in its pure state in the form of graphite or more rarely as diamond. Gold, silver and sulfur are other elements which are also found in its pure state. Even though these are pure elements they qualify to be known as minerals, but no chemical process is required on them further.Oxides: When an ore is found in which one or more elements are combined with oxygen, it is an oxide mineral. These may have chemical formulas of type XO (MgO, ZnO, CuO, etc.), X2O (Cu2O), X2O3 (Al2O3, Fe2O3), XO2 (MnO2, SnO2) and XY2O4 (MgAl2O4, FeCr2O4). The oxide minerals, are mostly of metallic elements. Example: hematite, magnetite, cuprite. Silicates and oxides are the most common types of minerals in volcanoes, especially after an eruption.Carbonates: The carbonate type of minerals are formed when a single carbonate ion (CO32-) reacts with a metal ion of complementing polarity. Example: siderite (FeCO3), smithsonite (ZnCO3), calcite (CaCO3). Carbonate minerals are used in making cement and other bonding material.Sulphates: The mineral class which includes the sulfate ion (SO42-) within its molecular structure, is categorized as sulphate mineral. Minerals like Gypsum (CaSO4·2H2O) and Barite (BaSO4) are examples of sulphate minerals.Organic Minerals: This class of minerals include biogenic substances, genesis or origin of which can be attributed to a geological processes. Organic minerals include all types of oxalates, mellitates, citrates, cyanates, acetates, formates, hydrocarbons, etc. Example of organic mineral includes whewellite, moolooite, mellite, fichtelite, carpathite, evenkite and abelsonite.
