User:Marshallsumter/Dominant group (chemistry)
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Completion status: this resource is a stub, which means that pretty much nothing has been done yet. |
The term "dominant group" appears to serve as an identifier used by authors of chemistry refereed journal articles to indicate an observation of phenomena in the course of analysis. At the more general level it may be a chemical entity such as a chemist, chemical species, or laboratory.
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Educational level: this is a tertiary (university) resource. |
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Type classification: this is a notes resource. |
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Subject classification: this is a chemistry resource. |
Functional group
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Per the Wikipedia article functional group: "In organic chemistry, functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. The same functional group will undergo the same or similar chemical reaction(s) regardless of the size of the molecule it is a part of.[1] However, its relative reactivity can be modified by nearby functional groups." "In diffuse clouds the dominant group appears to be -CH3."[2]
Ions
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From the Wikipedia article ion: "An ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge."
The hydrogen anion (shown in the diagram at right), with its loosely held two-electron cloud, has a larger radius than the neutral atom, which in turn is much larger than the bare proton of the cation. Hydrogen forms the only cation that has no electrons, but even cations that (unlike hydrogen) retain one or more electrons, are smaller than the neutral atoms or molecules from which they are derived.
"In the second dominant group of ions we generally see more discrepancies in the model and the HIS data".[3]
Organic acids
[edit | edit source]"An organic acid is an organic compound with acidic properties. The most common organic acids are the carboxylic acids, whose acidity is associated with their carboxyl group –COOH." per the Wikipedia article organic acid.
"That good correlation can be obtained if one focuses attention on the dominant group can be nicely illustrated with the benzoic acids."[4]
Volatile organic compound
[edit | edit source]From the Wikipedia article volatile organic compound: "Volatile organic compounds (VOCs) are organic chemicals that have a high vapor pressure at ordinary, room-temperature conditions. Their high vapor pressure results from a low boiling point, which causes large numbers of molecules to evaporate or sublimate from the liquid or solid form of the compound and enter the surrounding air."
"As such alcohols became the dominant group of volatiles in the overripe mango, the relative concentrations of other groups of compounds were, of course, correspondingly reduced."[5]
See also
[edit | edit source]References
[edit | edit source]- ↑ "Compendium of Chemical Terminology (IUPAC "Gold Book")".
- ↑ W. W. Duley, D. A. Williams (July 1981). "The infrared spectrum of interstellar dust-Surface functional groups on carbon". Royal Astronomical Society, Monthly Notices 196 (7): 269-74.
- ↑ R. Wegmann, H.U. Schmidt, W.F. Huebner, and D.C. Boice (November 1987). "Cometary MHD and chemistry". Astronomy and Astrophysics 187 (1-2): 339-50.
- ↑ Toshio Fujita, Junkichi Iwasa, and Corwin Hansch (December 1964). "A New Substituent Constant, π, Derived from Partition Coefficients". Journal of the American Chemical Society 86 (23): 5175-80. doi:10.1021/ja01077a028. http://tryptophan.net/chem4120/Hansch-Pi.pdf. Retrieved 2011-08-16.
- ↑ Alexander J. MacLeod and Carl H. Snyder (May 1985). "Volatile components of two cultivars of mango from Florida". Journal of Agricultural and Food Chemistry 33 (3): 380-4. http://pubs.acs.org/doi/abs/10.1021/jf00063a015. Retrieved 2011-11-28.