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Chromium is a chemical element with the symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard, and brittle transition metal. Oxidation states: −4, −2, −1, 0, +1, +2, +3, +4, … Atomic number (Z): 24 Atomic radius: empirical: 128 pm When liquid (at m.p.): …
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Citric acid is found naturally in citrus fruits, especially lemons and limes. It’s what gives them their tart, sour taste. A manufactured form of citric acid is commonly used as an additive in food, cleaning agents, and nutritional supplements. However, this manufactured form differs from what’s found naturally in citrus fruits. For this reason, you …
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Clover can be a good feed source for most horses because it provides useful energy and adequate protein and fiber. You can use clover in hay or pastures. Clovers can sometimes mold, which causes slobbers, photosensitivity (reactive to light) and bleeding. Clover is also a good feed for livestock. Cattle and sheep that graze on …
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When referring to coagulants, positive ions with high valence are preferred. Generally aluminium and iron are applied, aluminium as Al2(SO4)3- (aluin) and iron as either FeCl3 or Fe2(SO4)3-. One can also apply the relatively cheap form FeSO4, on condition that it will be oxidised to Fe3+ during aeration. Coagulation is very dependent on the doses …
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Coal is a nonrenewable fossil fuel that is combusted and used to generate electricity. Mining techniques and combustion are both dangerous to miners and hazardous to the environment. Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, …
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In the past half century, Coal Injection have been used in industrial and large areas, with the increasing domestic steel production capacity and the continuous progress and perfection of the key technology of blast furnace coal powder blowing, the market demand has gradually expanded, especially in recent years, with the increasing shortage of high-quality coking …
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Cobalt is a chemical element with the symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth’s crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.
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Coke is a kind of solid fuel. Coal is obtained by dry distillation at a high temperature of about 1000 degrees C. The main components are fixed carbon, followed by ash, containing very little volatile and sulfur. Silver-grey with a metallic sheen. Hard and porous. Most of its heat is 26380 to 31400kJ/kg (6300 to …
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Coltan is a dull black metallic ore from which the elements niobium and tantalum are extracted. The niobium-dominant mineral in coltan is columbite, and the tantalum-dominant mineral is the tantalite.
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Wires are made from metals. Some of the metals used include steel, copper, aluminum, and silver. We use these materials to make wires because of their properties. Metals have a high melting point and are usually a solid at room temperature.
