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Encyclopedia > Hydrochlorofluorocarbon

This article should be merged with Freon, Halon, CFC, and Hydrochlorofluorocarbon and added to Alkyl halide Freon is a trade name for a group of chlorofluorocarbons used primarily as a refrigerant. ... This article or section should be merged with Freon, Halon, CFC, and Hydrochlorofluorocarbon and added to Alkyl halide Halons are a group of compounds obtained by replacing the hydrogen atoms of a hydrocarbon with halogen atoms, such as bromine or fluorine. ... For other uses, see CFC (disambiguation). ... In chemistry, an alkyl halide is an organic molecule of the form R_X, where X is a halide and R contains a carbon atom bonded to other functional groups or hydrogens. ...


Hydrochlorofluorocarbons (HCFCs) is one of a class of fluorocarbon compounds that are used primarily as chlorofluorocarbon (CFC) substitutes. Fluorocarbons are carbon-fluorine compounds that often contain other elements such as hydrogen, chlorine, or bromine. ... For other uses, see CFC (disambiguation). ...


When CFCs break down, they release atomic chlorine which breaks down ozone. Moreover, CFCs primarily break down in the upper atmosphere where the protective ozone layer exists. General Name, Symbol, Number chlorine, Cl, 17 Series halogens Group, Period, Block 17 (VIIA), 3, p Density, Hardness 3. ... Ozone (O3) is an allotrope of oxygen, the molecule consisting of three oxygen atoms instead of the more stable diatomic O2. ... The ozone layer is that part of the Earths stratosphere which contains relatively high concentrations of ozone. ...


Work on CFC alternatives began in the late 1970s after the first warnings of CFC damage to stratospheric ozone. By adding hydrogen to the chemical formulation, chemists made CFCs less stable in the lower atmosphere enabling them to break down before reaching the ozone layer. Events and trends Although in the United States and in many other Western societies the 1970s are often seen as a period of transition between the turbulent 1960s and the more conservative 1980s and 1990s, many of the trends that are associated widely with the Sixties, from the Sexual Revolution... The Stratosphere is also a major hotel and casino resort in Las Vegas. ... General Name, Symbol, Number Hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1 (IA), 1 , s Density, Hardness 0. ...


Still, HCFCs do release chlorine and have contributed to more chlorine buildup in the upper atmospheric than originally predicted. Development of non-chlorine based chemical compounds as a substitute for CFCs and HCFCs continues. General Name, Symbol, Number chlorine, Cl, 17 Series halogens Group, Period, Block 17 (VIIA), 3, p Density, Hardness 3. ...


External links

  • Numbering Scheme for Ozone-Depleting Substances and their Substitutes (http://www.epa.gov/ozone/geninfo/numbers.html)
  • Class II Ozone-Depleting Substances (HCFC's) (http://www.epa.gov/ozone/ods2.html)

  Results from FactBites:
 
Haloalkane - Wikipedia, the free encyclopedia (3240 words)
Hydrochlorofluorocarbons (HCFCs) is one of a class of haloalkanes where not all hydrogen has been replaced by chlorine or fluorine.
Adding hydrogen and thus creating hydrochlorofluorocarbons (HCFC), chemists made the compound less stable in the lower atmosphere enabling them to break down before reaching the ozone layer.
Hydrochlorofluorocarbons (HCFCs) are much more reactive than CFC's, so a large fraction of the HCFCs emitted break down in the troposphere, and hence are removed before they have a chance to affect the ozone layer.
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