ferrosoferric oxide
... iron: Compounds: Ferrosoferric oxide occurs as the mineral magnetite in the form of magnetic, black or red-black crystals. It ... is prepared by passing steam over red-hot iron. The oxide is widely employed in ferrites, substances with high magnetic ... occurrence of iron. *. In iron: Compounds. Ferrosoferric oxide occurs as the mineral magnetite in the form of magnetic, black ... It is prepared by passing steam over red-hot iron. The oxide is widely employed in ferrites, substances with high magnetic ...
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haemochromogen (chemical compound). hemochromogen, compound of the iron-containing pigment heme with a protein or other ... cytochrome: Hemoproteins are proteins linked to a nonprotein, iron-bearing component. It is the iron (heme) group attached to ... that constitutes the most important iron ore because of its high iron content (70 percent) and its abundance. Its name is ... hemoglobin, iron-containing protein in the blood of many animals-in the red blood cells (erythrocytes) of vertebrates-that ...
Mineral deposit - Roll-Front, Uranium, Ore | Britannica
... whereas U4+ compounds are not. So long as the groundwater remains oxidizing, uranyl ions are stable and uranium can be ... Uranyl compounds tend to be soluble in groundwater, ... This class of deposit comprises compounds of iron or manganese ... Uranyl compounds tend to be soluble in groundwater, whereas U4+ compounds are not. So long as the groundwater remains oxidizing ...
chemistry - Students | Britannica Kids | Homework Help
... when the iron is exposed to moist air. They combine with the iron to form rust, which is a chemical compound called ferric ... Carbon compounds account for the great majority of all known compounds. Among compounds studied by organic chemists are those ... compound. A substance containing two or more kinds of atoms in chemical combination. The atoms in a compound can be separated ... Compounds are formed by a process called a chemical reaction. Elements combine, or react, to form compounds that have physical ...
Metallurgy - Extractive, Refining, Alloying | Britannica
Metallic compounds are frequently rather complex mixtures (those treated commercially are for the most part sulfides, oxides, ... before extractive metallurgy can effect the separation of metallic elements from the other constituents of a compound, it must ... often convert the compound into a type that can be more readily treated. Common ... in which their metallic elements are extracted from chemical compound form and refined of impurities. ...
Catalysis - Heterogeneous, Enzymes, Reactions | Britannica
The first of these can be examined on the reduced-iron catalyst by following the progress of the reaction H2 + D2→ 2HD (in ... In the case of a generalized ethylenic compound, CH2=CHR, stereoregular polymerization may yield three different arrangements ... Nitrogen is rapidly chemisorbed on synthetic ammonia-iron catalyst in the region above 400 °C (750 °F). It has been shown that ... This conclusion is confirmed by measurement of rate of adsorption of nitrogen on the iron catalysts. Other, similar isotopic ...
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heat of formation, the amount of heat absorbed or evolved when one mole of a compound is formed from its constituent elements, ... helmet: …of metal increased until entire helmets were fashioned of iron, still following the same form. About the year 1200 the ... Resistors may be composed of metal-alloy wire, nonmetallic carbon compounds, or printed circuits. Heating elements may have ... Ruben Harmon, the first white settler (1797), and others discovered deposits of coal, iron ore, and limestone there. ...
United States - Students | Britannica Kids | Homework Help
More and more iron ore passed through the Soo Locks at Sault Sainte Marie; more and more iron and steel was made at Great Lakes ... Nylon, Lucite, and other chemical compounds used to produce plastics were also developed in the area. Beginning in the 1970s, ... Iron was made in the Pine Barrens of southern New Jersey beginning late in the 17th century. Bog iron was used. Power was ... Because it takes twice as much coke as iron ore to produce a batch of steel, Connellsville coke helped to root the iron and ...
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the man in the iron mask: …have proven tenable: those for Ercole Matthioli and for Eustache Dauger. ... which is vented and purges the green beer of undesirable volatile compounds. Continued yeast activity also… ...
invention - Students | Britannica Kids | Homework Help
... strong cast iron, a knowledge of heat, evaporation, and condensation, and a method of measuring the heat energy in steam. ... compound microscope. 1590. Zacharias Janssen. Dutch. thermometer. 1593. Galileo. Italian. barometer. 1643. Evangelista ...
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Fuji Iron & Steel Co., Ltd. (Japanese company). Nippon Steel Corporation: , and Fuji Iron & Steel Co., Ltd. It ranks among ... which remove hydrogen sulfide from the gas stream and then separate that compound into elemental hydrogen and sulfur; small ...
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In 1881 a French company began to work the local iron-ore deposits, and a railway was ... was awarded the 1996 Nobel Prize for Chemistry for their joint discovery of the carbon compounds called fullerenes. Kroto ... In 1881 a French company began to work the local iron-ore deposits, and a railway was ... was awarded the 1996 Nobel Prize for Chemistry for their joint discovery of the carbon compounds called fullerenes. Kroto ...
Human nutrition - Fats, Oils, Diet | Britannica
Wines are devoid of vitamins but sometimes contain large amounts of iron, probably acquired from iron vessels used in their ... The predominant substances in fats and oils are triglycerides, chemical compounds containing any three fatty acids combined ...