Calcium carbonate is a chemical compound, with chemical formula CaCO3. It is commonly used as an antacid, and is the active ingredient in agricultural lime. It is a common substance found as rock in all parts of the world and is the main component of seashells and the shell of snails. Calcium carbonate - Occurrence. Calcium carbonate is found naturally as the following minerals and rocks: Aragonite Calcite Chalk Limestone Marble Tra ...

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• Calcium carbonate - Chemical properties
• Calcium carbonate - Uses

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Calcium carbonate, Calcium carbonate - Occurrence, Calcium carbonate - Preparation, Calcium carbonate - Chemical properties, Calcium carbonate - Uses

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Calcium carbonate shares the typical properties of other carbonates. Notably: it reacts with strong acids, releasing carbon dioxide. CaCO3 + 2HCl → CaCl2 + CO2 + H2O it releases carbon dioxide on heating (to above 825 °C in the case of CaCO3), to form calcium oxide. CaCO3 → CaO + CO2 Calcium carbonate will react with water that ...

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Calcium carbonate, Calcium carbonate - Occurrence, Calcium carbonate - Preparation, Calcium carbonate - Chemical properties, Calcium carbonate - Uses

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The chemical compound and unsaturated hydrocarbon acetylene, also known under IUPAC nomenclature (see IUPAC nomenclature of organic chemistry) as ethyne, was discovered in 1836 by Edmund Davy, in England. Acetylene - Preparation. The principal raw materials for acetylene manufacture are calcium carbonate (limestone) and coal. The calcium carbonate is first converted into calcium oxide and the coal into coke, then the two are reacted with each other to form calcium carbide and carbon monoxide:

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Calcareous refers to a sediment, sedimentary rock, or soil type which is formed from or contains a high proportion of calcium carbonate in the form of calcite or aragonite. It is also used to refer to relatively alkaline soil. Frequently this is indeed due to a high calcareous content but there are other causes for a high soil pH. Calcareous coatings, or calcareous deposits, are mixtures of calcium carbonate and magnesium hydroxide that are deposited on cathodically protected surfaces because of the increas ...

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Agricultural lime is a soil additive made from pulverized limestone or chalk. The primary active component is calcium carbonate. Additional chemicals vary depending on the mineral source and may include calcium oxide, magnesium oxide and magnesium carbonate. Effects on soil; raised pH of acidic soils source of Calcium for the plants improved water penetration for acidic soils Agricultural lime may occur naturally in some soils but require addition of sulfuric acid for its agriculturial benefits to be realized. Gypsum is also used to supply calci ...

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Carbonatation is the process used in the production of sugar from sugar beet, whereby raw beet juice is mingled with milk of lime and carbon dioxide enriched gas in carbonation tanks. Carbonatation involves the following effects: The increase in alkalinity coagulates proteins in the juice. Calcium carbonate absorbs colourants Alkalinity destroys some monos ...

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A pearl is a hard, rounded object produced by certain mollusks, primarily oysters. Pearl is valued as a gemstone and is cultivated or harvested for jewellery. Pearls are formed inside the shell of certain bivalve mollusks. As a response to an irritating object inside its shell, the mollusk will deposit layers of calcium carbonate (CaCO3) in the form of the minerals aragonite or calcite (both crystalline forms of calcium carbonate) held together by an organic horn-like compound called conchiolin. This combination of calcium carbonate and conchiolin is called ...

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The carbonate mineral calcite is a calcium carbonate corresponding to the formula CaCO3 and is one of the most widely distributed minerals on the Earth's surface. It is a common constituent of sedimentary rocks, limestone in particular. It is also the primary mineral in metamorphic marble. It also occurs as a vein mineral in deposits from hot springs, and also occurs in caverns as stalactites and stalagmites. Calcite is often the primary constituent of the shells of marine organisms (e.g. plankton, bivalves, etc.). Calcite represents the stable form of calcium carbonat ...

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Calcium carbide is a chemical compound with the chemical formula CaC2. It has the appearance of grayish white lumps. Calcium carbide is produced by electric discharge through a mixture of lime and carbon at high temperature. The compound reacts vigorously with water to form acetylene. This reaction is the basis of the industrial manufacture of dissolved acetylene (DA), a ...

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The hard, rigid outer calcium carbonate covering of certain animals is called a shell. While many animals, particularly those that live in the sea, produce exoskeletons, usually only those of mollusks are considered to be shells. It is sometimes erroneously claimed that shells are made of chitin, but these are unrelated materials (except for their hardness and use as a covering by animals). The shell is usually made of nacre, an organic mixture of outer layers of horny conchiolin (a scleroprotein), followed by an intermediate layer of calcite or aragonite, and then a layer of calcium carbonat ...

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Apex is the, usually pointed, tip of the spire of the shell of a gastropod. It is the first-formed and therefore the oldest part of the shell. It is the embryonic shell. The apex of univalves is the top of the shell-tip of the protoconch. The apex of bivalves is the umbos, beaks or prodissoconch. The apex of tusk shells is the small, open posterior end. Like the rest of the shell, the apex is made of calcium carbonate. The apical whorls, or protoconch, are the whorls at the apex, especially when clearly dis ...

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Camerae (sing. Camera) are the spaces or chambers enclosed between two adjacent septa in the phragmocone of a nautiloid or ammonoid cephalopod. These can be seen in cross-sections of a nautilus shell and in the polished cross-sections of ammonites. In life these chambers are filled with gas, mediated by the siphuncle, and used to control buoyancy. Some Palaeozoic nautiloid genera, especially those with long, straight shells, are distinguished by Cameral Deposits. These were accumulations of calcium carbonate secreted in ...

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Coccolithophores are single-celled algae belonging to the haptophytes. They are distinguished by special calcium carbonate plates (or scales) of unknown purpose called coccoliths, which are important microfossils. Coccolithophores are exclusively marine and are found in large numbers throughout the surface euphotic zone of the ocean. An example of a globally significant coccolithophore is Emiliania huxleyi. See also. Cyanobacteria Brown Algae Diatom Gol ...

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Caliche is a hardened deposit of calcium carbonate. This calcium carbonate cements together other materials, including gravel, sand, clay, and silt. It is found in aridisol and mollisol soil orders. Caliche occurs worldwide, generally in arid or semi-arid regions, including in central and western Australia, in the Kalahari Desert, and in the High Plains of the western USA. Caliche is also known as hardpan, calcrete, kankar (in India), or duricrust. The term caliche is Spanish and is origin ...

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Charcoal is the blackish residue consisting of impure carbon obtained by removing water and other volatile constituents of animal and vegetable substances. It is usually produced by heating wood in the absence of oxygen (see char), but sugar charcoal, bone charcoal (which contains a great amount of calcium phosphate), and others can be produced as well. The light, black, porous material is 85% to 98% carbon, the remainder consisting of ...

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Borosilicate glass is a particular type of glass, better known under the brand names Pyrex and Kimax. It was first developed by German glassmaker Otto Schott in the late 19th century and sold under the brand name "Duran" in 1893. After Corning Glass Works developed Pyrex in 1924, it became a synonym for borosilicate glass in the English-speaking world. In addition to the quartz, sodium carbonate, and calcium carbonate traditionally used in glassmaking, boron is used in the manufacture of borosilicate glass. Typically, the resul ...

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Nacre, also known as mother of pearl or sadaf, is a naturally occuring organic-inorganic composite. It is formed of layers of calcium carbonate (CaCO3) platelets (crystals), in the form of aragonite and conchiolin (a scleroprotein), separated by elastic biopolymers (such as chitin and lustrin). This mixture of hard and elastic domains makes the material strong and resilient. Strength and resilience is also likely to be due to the offset or "brickwork" arrangement of the platelets, ...

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A coral reef is a type of biotic reef that develops in tropical waters by reef-building, or hermatypic, corals. Coral reefs are formed of large amounts of calcium carbonate (limestone) that is deposited by corals and other organisms. Coral reefs come in a variety of forms, and provide a habitat for an amazing variety of organisms. Coral reef - Coral Reef Biology. The building blocks of coral reefs are the skeletons of generations of reef-building hard corals, which are composed of calcium carbonate. As each ...

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Cancrinite is a mineral, a complex carbonate and silicate of sodium, calcium and aluminium; formula Na6Ca2[(CO3,Al6Si6O24].2H2O. It is classed as a member of the Feldspathoid group of mineral; the alkali feldspars that a poor in silica. Yellow, orange, pink, white or even blue, it has a vitreous or pearly lustre; hardness 5-6 and an ineven conchoidal fracture. It is unusual among the silicate minerals in that it will effervesce with hydroc

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