Precious metalPrecious metals are rare, naturally occurring metallic chemical elements of high economic value. Chemically, the precious metals tend to be less reactive than most elements (see noble metal). They are usually ductile and have a high lustre. Historically, precious metals were important as currency but are now regarded mainly as investment and industrial raw materials. Gold, silver, platinum, and palladium each have an ISO 4217 currency code. The best known precious metals are the coinage metals, which are gold and silver.
Reaction mechanismIn chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical reaction occurs. A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction. The detailed steps of a reaction are not observable in most cases. The conjectured mechanism is chosen because it is thermodynamically feasible and has experimental support in isolated intermediates (see next section) or other quantitative and qualitative characteristics of the reaction.
AlkeneIn organic chemistry, an alkene is a hydrocarbon containing a carbon–carbon double bond. The double bond may be internal or in the terminal position. Terminal alkenes are also known as α-olefins. The International Union of Pure and Applied Chemistry (IUPAC) recommends using the name "alkene" only for acyclic hydrocarbons with just one double bond; alkadiene, alkatriene, etc., or polyene for acyclic hydrocarbons with two or more double bonds; cycloalkene, cycloalkadiene, etc.
Saint-JérômeSaint-Jérôme (sɛ̃ ʒeʁom) (2021 population 80,213) is a suburban city located about northwest of Montreal on the Rivière du Nord. It is part of the North Shore sector of Greater Montreal. It is a gateway to the Laurentian Mountains and its resorts via the Autoroute des Laurentides. The town is named after Saint Jerome (ca. 347 – September 30, 420), a church father best known as the translator of the Bible from Greek and Hebrew into Latin. His translation is known as the Vulgate.
Monody (band)Monody is a 3-member synthpop / EBM / Futurepop band from the United States. Formed in 2006 in Portland, Oregon. In 2008, Monody released 4 debut singles entitled: 'Bound', 'Absent', 'Ceti Lullaby', and 'In Between'. On January 24 2008, Monody was featured in an Oregon Public Broadcasting segment on the construction in Portland, Oregon. Daniel Edgar (member) was recognized for using various construction sounds in a number of Monody songs. The song 'Beneath Andromeda' was featured in the segment.
Heinz FalkHeinz Falk (born April 29, 1939, in Sankt Pölten, Lower Austria) is professor emeritus for organic chemistry at Johannes Kepler University of Linz and editor of "Progress in the Chemistry of Organic Natural Compounds". His research is focused on structural analysis, synthesis, stereochemistry and photochemistry of plant and animal photosensitizing and photosensory pigments, such as hypericin. Heinz Falk was born April 29, 1939, in Sankt Pölten, Austria, went to elementary school in Statzendorf and completed middle school in Krems an der Donau.
Ulrich SchnaussUlrich Schnauss (born 1977) is a German electronic musician and producer based in London, England. He is best known for being a member of Tangerine Dream from 2014 to 2020. Ulrich Schnauss was born in the northern German seaport of Kiel in 1977. He had piano lessons when he was seven. He became interested in a range of music: My Bloody Valentine, Slowdive, Tangerine Dream, Chapterhouse, and early bleep and breakbeat tracks. There was not much opportunity to see his musical influences in Kiel, so he moved to Berlin in 1996.
Jerome County, IdahoJerome County is a county in the U.S. state of Idaho. As of the 2020 Census the county had a population of 24,237. The county seat and largest city is Jerome. The county was created by the Idaho Legislature on February 8, 1919, by a partition of Lincoln County. It was named after either Jerome Hill, a developer of the North Side Irrigation Project, his son-in-law Jerome Kuhn, or his grandson Jerome Kuhn, Jr. Jerome County is part of the Twin Falls, ID Micropolitan Statistical Area.
PH indicatorA pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor.
Metals of antiquityThe metals of antiquity are the seven metals which humans had identified and found use for in prehistoric times in Europe and the Middle East: gold, silver, copper, tin, lead, iron, and mercury. These seven are the metals from which the classical world was forged; until the discovery of antimony in the 9th century, and arsenic in the 13th (both now classified as metalloids), these were the only known elemental metals, compared to approximately 90 known today. The metals of antiquity generally have low melting points, with iron being the exception.
Pericyclic reactionIn organic chemistry, a pericyclic reaction is the type of organic reaction wherein the transition state of the molecule has a cyclic geometry, the reaction progresses in a concerted fashion, and the bond orbitals involved in the reaction overlap in a continuous cycle at the transition state. Pericyclic reactions stand in contrast to linear reactions, encompassing most organic transformations and proceeding through an acyclic transition state, on the one hand and coarctate reactions, which proceed through a doubly cyclic, concerted transition state on the other hand.
AluminiumAluminium (aluminum in North American English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals; about one-third that of steel. It has a great affinity towards oxygen, forming a protective layer of oxide on the surface when exposed to air. Aluminium visually resembles silver, both in its color and in its great ability to reflect light. It is soft, nonmagnetic and ductile.
