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Look up cho or Cho in Wiktionary, the free dictionary. |
Cho may refer to:
Surname [link]
- Cho (Korean name), one romanization of the common Korean surname 조, derived from the Chinese surnames Zhao (Hanja 趙) and Cao (曺)
- Cho, a Minnan dialect romanization of the Chinese surname Cao
- Chō, the romanji for the uncommon Japanese surname derived from the Chinese Zhang (Kanji 張)
- Cho U, a Taiwanese go player who romanizes his name in the Japanese fashion
- Cho Hakkai, the Japanese name for Zhu Bajie or "Pigsy", one of the travellers in Journey to the West
- Cho Hakkai (Saiyuki), the same character in the anime series Saiyuki'
Given name [link]
- Cho Ramaswamy, an actor, columnist, and political commentator in Tamil Nadu, India
- Cho Cheng, a Chinese American fashion designer
- Yūichi Nagashima, a seiyū who goes by the stage name Chō
Other [link]
- cho, an ancient Japanese unit of length approximately equal to 109.1 meters
- Nokia's internal codename for the 6681 mobile phone
See also [link]
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This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article. |
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Aldehyde
An aldehyde /ˈældᵻhaɪd/ or alkanal is an organic compound containing a formyl group. The formyl group is a functional group, with the structure R-CHO, consisting of a carbonyl center (a carbon double bonded to oxygen) bonded to hydrogen and an R group, which is any generic alkyl or side chain. The group without R is called the aldehyde group or formyl group. Aldehydes differ from ketones in that the carbonyl is placed at the end of a carbon skeleton rather than between two carbon atoms. Aldehydes are common in organic chemistry. Many fragrances are aldehydes.
Structure and bonding
Aldehydes feature an sp2-hybridized, planar carbon center that is connected by a double bond to oxygen and a single bond to hydrogen. The C-H bond is not acidic. Because of resonance stabilization of the conjugate base, an α-hydrogen in an aldehyde (not shown in the picture above) is far more acidic, with a pKa near 17, than a C-H bond in a typical alkane (pKa about 50). This acidification is attributed to (i) the electron-withdrawing quality of the formyl center and (ii) the fact that the conjugate base, an enolate anion, delocalizes its negative charge. Related to (i), the aldehyde group is somewhat polar.
Cubohemioctahedron
In geometry, the cubohemioctahedron is a nonconvex uniform polyhedron, indexed as U15. Its vertex figure is a crossed quadrilateral.
It is given Wythoff symbol 4/3 4 | 3, although that is a double-covering of this figure.
A nonconvex polyhedron has intersecting faces which do not represent new edges or faces. In the picture vertices are marked by golden spheres, and edges by silver cylinders.
It is a hemipolyhedron with 4 hexagonal faces passing through the model center. The hexagons intersect each other and so only triangle portions of each are visible.
Related polyhedra
It shares the vertex arrangement and edge arrangement with the cuboctahedron (having the square faces in common), and with the octahemioctahedron (having the hexagonal faces in common).
Tetrahexagonal tiling
The cubohemioctahedron can be seen as a net on the hyperbolic tetrahexagonal tiling with vertex figure 4.6.4.6.
Hexahemioctacron
The hexahemioctacron is the dual of the cubohemioctahedron, and is one of nine dual hemipolyhedra. It appears visually indistinct from the octahemioctacron.
