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Mitscherlichite
Potassium tetrachloridocuprate(II) is a salt with chemical formula , also written as ()2·[]2−. The compound is often found as the dihydrate ·2, which is a brilliant greenish blue crystalline solid. This form also occurs naturally as the rare mineral mitscherlichite. The compound is also called potassium tetrachlorocuprate(II), dipotassium tetrachlorocuprate, potassium copper(II) tetrachloride, potassium cupric chloride and other similar names. Dihydrate Synthesis and natural occurrence The dihydrate occurs rarely in nature near volcanic vents, e.g. in Mount Vesuvius, as the mineral mitscherlichite; which is named in honor of Eilhardt Mitscherlich (1794–1863), the German crystallographer and chemist who first synthesized the compound. It was identified as pigment in some ancient artifacts. The dihydrate can be obtained by slow evaporation of a solution of potassium chloride () and copper(II) chloride () in 2:1 molar ratio. Crystal structure The crystal structure o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitscherlichite Crystals
Potassium tetrachloridocuprate(II) is a salt with chemical formula , also written as ()2·[]2−. The compound is often found as the dihydrate ·2, which is a brilliant greenish blue crystalline solid. This form also occurs naturally as the rare mineral mitscherlichite. The compound is also called potassium tetrachlorocuprate(II), dipotassium tetrachlorocuprate, potassium copper(II) tetrachloride, potassium cupric chloride and other similar names. Dihydrate Synthesis and natural occurrence The dihydrate occurs rarely in nature near volcanic vents, e.g. in Mount Vesuvius, as the mineral mitscherlichite; which is named in honor of Eilhardt Mitscherlich (1794–1863), the German crystallographer and chemist who first synthesized the compound. It was identified as pigment in some ancient artifacts. The dihydrate can be obtained by slow evaporation of a solution of potassium chloride () and copper(II) chloride () in 2:1 molar ratio. Crystal structure The crystal structure o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eilhardt Mitscherlich
Eilhard Mitscherlich (; 7 January 179428 August 1863) was a German chemist, who is perhaps best remembered today for his discovery of the phenomenon of crystallographic isomorphism in 1819. Early life and work Mitscherlich was born at Neuende (now a part of Wilhelmshaven) in the Lordship of Jever, where his father was pastor. His uncle, Christoph Wilhelm Mitscherlich (1760–1854), professor at the University of Göttingen, was in his day a celebrated scholar. Eilhard Mitscherlich was educated at Jever by the historian Friedrich Christoph Schlosser, and in 1811 went to the University of Heidelberg devoting himself to philology, with an emphasis on the Persian language. In 1813 he went to Paris to seek permission to join the embassy which Napoleon I of France was establishing in Persia. The abdication of Napoleon Bonaparte in 1814 put an end to this, and Mitscherlich resolved to study medicine in order that he might enjoy that freedom of travel usually allowed in the East to p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cesium Tetrachloridocuprate(II)
Caesium (IUPAC spelling) (or cesium in American English) is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of , which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium has physical and chemical properties similar to those of rubidium and potassium. It is pyrophoric and reacts with water even at . It is the least electronegative element, with a value of 0.79 on the Pauling scale. It has only one stable isotope, caesium-133. Caesium is mined mostly from pollucite. The element has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. Caesium-137, a fission product, is extracted from waste produced by nuclear reactors. The German chemist Robert Bunsen and physicist Gustav Kirchhoff discovered caesium in 1860 by the newly developed method of flame spectroscopy. The first small-scale applications for caesium we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roscoe G
Roscoe, also spelled Rosco or Roscow, may refer to: People * Roscoe (name) Places United States *Roscoe, California (other) *Roscoe Township (other) *Roscoe, Georgia, an unincorporated community *Roscoe, Illinois, a village *Roscoe, Minnesota, a city * Roscoe, Goodhue County, Minnesota, an unincorporated community *Roscoe, Missouri, a village *Roscoe, Montana, a settlement * Roscoe, Nebraska, an unincorporated community and census-designated place *Roscoe, New York, a hamlet *Roscoe, Pennsylvania, a borough *Roscoe, South Dakota, a city *Roscoe, Texas, a town *Roscoe Village, a neighborhood in North Center, Chicago, Illinois *Roscoe Village (Coshocton, Ohio) *Roscoe Independent School District, Texas Canada *Roscoe River, Nunavut and the Northwest Territories, Canada *Roscoe Glacier, Queen Mary Land, Antarctica Other uses * Roscoe's House of Chicken 'n Waffles, a popular California restaurant chain * Roscoe Wind Farm, Roscoe, Texas * ROSCO, an acronym for Brit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potassium Compounds
Potassium is the chemical element with the symbol K (from Neo-Latin ''kalium'') and atomic number19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmospheric oxygen to form flaky white potassium peroxide in only seconds of exposure. It was first isolated from potash, the ashes of plants, from which its name derives. In the periodic table, potassium is one of the alkali metals, all of which have a single valence electron in the outer electron shell, that is easily removed to create an ion with a positive charge – a cation, that combines with anions to form salts. Potassium in nature occurs only in ionic salts. Elemental potassium reacts vigorously with water, generating sufficient heat to ignite hydrogen emitted in the reaction, and burning with a lilac- colored flame. It is found dissolved in sea water (which is 0.04% potassium by weight), and occurs in many minerals such as orthoclase, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potassium Trichloridocuprate(II)
Potassium trichloridocuprate(II) is a salt with chemical formula , more properly . It is a member of the "halide" sub-family of perovskite materials with general formula where is a monovalent cation, is a divalent cation, and is a halide anion. The compound occurs in nature as the bright red mineral sanguite. The compound is also called potassium trichlorocuprate(II), potassium copper(II) trichloride, potassium cupric chloride and other similar names. The latter is used also for potassium tetrachloridocuprate(II) . Preparation and properties The compound can be obtained by evaporation of a solution of potassium chloride and copper(II) chloride in 1:1 mole ratio. The anhydrous form is garnet-red. It can be crystallized from a molten mixture of potassium chloride and copper(II) chloride . or by evaporation from a solution of the salts in ethanol. It is very hygroscopic, and soluble in methanol and ethanol. It is antiferromagnetic below 30 K, and pleochroic, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Congruent Melting
Congruent melting occurs during melting of a compound when the composition of the liquid that forms is the same as the composition of the solid. It can be contrasted with incongruent melting. This generally happens in two-component systems. To take a general case, let A and B be the two components and AB a stable solid compound formed by their chemical combination. If we draw a phase diagram for the system, we notice that there are three solid phases, namely A, B and compound AB. Accordingly, there will be three fusion or freezing point curves AC, BE and CDE for the three solid phases. In the phase diagram, we can notice that the top point D of the phase diagram is the congruent melting point of the compound AB because the solid and liquid phases now have the same composition. Evidently, at this temperature, the two-component system has become a one-component system because both solid and liquid phases contains only the compound AB.Atkins' Physical Chemistry, 8th edition, by Peter A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potassium Trichloridocuprate
Potassium trichloridocuprate(II) is a salt with chemical formula , more properly . It is a member of the "halide" sub-family of perovskite materials with general formula where is a monovalent cation, is a divalent cation, and is a halide anion. The compound occurs in nature as the bright red mineral sanguite. The compound is also called potassium trichlorocuprate(II), potassium copper(II) trichloride, potassium cupric chloride and other similar names. The latter is used also for potassium tetrachloridocuprate(II) . Preparation and properties The compound can be obtained by evaporation of a solution of potassium chloride and copper(II) chloride in 1:1 mole ratio. The anhydrous form is garnet-red. It can be crystallized from a molten mixture of potassium chloride and copper(II) chloride . or by evaporation from a solution of the salts in ethanol. It is very hygroscopic, and soluble in methanol and ethanol. It is antiferromagnetic below 30 K, and pleochroic, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phase Diagram
A phase diagram in physical chemistry, engineering, mineralogy, and materials science is a type of chart used to show conditions (pressure, temperature, volume, etc.) at which thermodynamically distinct phases (such as solid, liquid or gaseous states) occur and coexist at equilibrium. Overview Common components of a phase diagram are ''lines of equilibrium'' or ''phase boundaries'', which refer to lines that mark conditions under which multiple phases can coexist at equilibrium. Phase transitions occur along lines of equilibrium. Metastable phases are not shown in phase diagrams as, despite their common occurrence, they are not equilibrium phases. Triple points are points on phase diagrams where lines of equilibrium intersect. Triple points mark conditions at which three different phases can coexist. For example, the water phase diagram has a triple point corresponding to the single temperature and pressure at which solid, liquid, and gaseous water can coexist in a stabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anhydrous
A substance is anhydrous if it contains no water. Many processes in chemistry can be impeded by the presence of water; therefore, it is important that water-free reagents and techniques are used. In practice, however, it is very difficult to achieve perfect dryness; anhydrous compounds gradually absorb water from the atmosphere so they must be stored carefully. Solids Many salts and solids can be dried using heat, or under vacuum. Desiccators can also be used to store reagents in dry conditions. Common desiccants include phosphorus pentoxide and silica gel. Chemists may also require dry glassware for sensitive reactions. This can be achieved by drying glassware in an oven, by flame, or under vacuum. Dry solids can be produced by freeze-drying, which is also known as lyophilization. Liquids or solvents In many cases, the presence of water can prevent a reaction from happening, or cause undesirable products to form. To prevent this, anhydrous solvents must be used when performi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angstrom
The angstromEntry "angstrom" in the Oxford online dictionary. Retrieved on 2019-03-02 from https://en.oxforddictionaries.com/definition/angstrom.Entry "angstrom" in the Merriam-Webster online dictionary. Retrieved on 2019-03-02 from https://www.merriam-webster.com/dictionary/angstrom. (, ; , ) or ångström is a metric unit of length equal to m; that is, one ten-billionth ( US) of a metre, a hundred-millionth of a centimetre,Entry "angstrom" in the Oxford English Dictionary, 2nd edition (1986). Retrieved on 2021-11-22 from https://www.oed.com/oed2/00008552. 0.1 nanometre, or 100 picometres. Its symbol is Å, a letter of the Swedish alphabet. The unit is named after the Swedish physicist Anders Jonas Ångström (1814–1874). The angstrom is often used in the natural sciences and technology to express sizes of atoms, molecules, microscopic biological structures, and lengths of chemical bonds, arrangement of atoms in crystals,Arturas Vailionis (2015):Geometry of Crystals Lect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
