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Hydrogen peroxide (H 2 O 2) is a nonplanar molecule with (twisted) C 2 symmetry; this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy.Although the O−O bond is a single bond, the molecule has a relatively high rotational barrier of 386 cm −1 (4.62 kJ/mol) for rotation between enantiomers via the trans configuration, and 2460 cm −1 (29.4 kJ/mol) via the cis ...
The cherry blossom, or sakura, is the flower of trees in Prunus subgenus Cerasus. "Sakura" usually refers to flowers of ornamental cherry trees, such as cultivars of Prunus serrulata, not trees grown for their fruit [1] : 14–18 [2] (although these also have blossoms ). Cherry blossoms have been described as having a vanilla -like smell, which ...
Methylphenidate, sold under the brand names Ritalin (/ˈrɪtəlɪn/ RIT-ə-lin) and Concerta (/kənˈsɜːrtə/ kən-SUR-tə) among others, is a potent central nervous system (CNS) stimulant used medically to treat attention deficit hyperactivity disorder (ADHD) and, to a lesser extent, narcolepsy. It is a primary medication for ADHD (e.g. in ...
the free encyclopedia that anyone can edit. 6,828,004 articles in English. From today's featured article. SMS Lothringen was the last of five pre-dreadnought battleships of the Braunschweig class built for the Imperial German Navy. Launched in May 1904, she was named for the then-German province of Lothringen.
Physical properties. Pure sodium hydroxide is a colorless crystalline solid that melts at 318 °C (604 °F) without decomposition and boils at 1,388 °C (2,530 °F). It is highly soluble in water, with a lower solubility in polar solvents such as ethanol and methanol. [14] Sodium hydroxide is insoluble in ether and other non-polar solvents.
Kinbane Castle (dusk) Kinbane Castle ( Caisleán Ceinn Bán, White Head Castle, Kenbane/Kenbaan Castle) is located in County Antrim, Northern Ireland, on a headland between Ballycastle and Ballintoy. The name comes from the Irish for "white head", referring to the limestone of the promontory. [1] Nowadays, the castle is largely destroyed.
Scientists have conducted morphological and molecular studies to understand how tardigrades relate to other lineages of ecdysozoan animals. Two plausible placements have been proposed: tardigrades are either most closely related to Arthropoda and Onychophora, or to nematodes..
