WebOct 21, 1999 · CFC-11 is unreactive in the lower atmosphere (below about 15 kilometers) and is similarly uniformly mixed there, as shown. The abundance of CFC-11 decreases … WebChlorodifluoromethane CHClF2 CID 6372 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities ...
Molar mass of CFC - WebQC
WebApr 18, 2024 · Chlorofluoromethanes are being added to the environment in steadily increasing amounts. These compounds are chemically inert and may remain in the … WebApr 5, 2024 · CFC stands for chlorofluorocarbon, which is an organic compound made up of carbon, fluorine, and chlorine. Hydrochlorofluorocarbons, or HCFCs, are CFCs that … bares teotihuacan
Chlorofluorocarbons and Ozone Depletion - American …
WebPartially halogenated chlorofluorocarbons (HCFCs) are compounds derived by the partial substitution of the hydrogen atoms in methane and ethane with both fluorine and … Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are fully or partly halogenated hydrocarbons that contain carbon (C), hydrogen (H), chlorine (Cl), and fluorine (F), produced as volatile derivatives of methane, ethane, and propane. The most common representative is dichlorodifluoromethane (R-12). … See more As in simpler alkanes, carbon in the CFCs bond with tetrahedral symmetry. Because the fluorine and chlorine atoms differ greatly in size and effective charge from hydrogen and from each other, the methane-derived … See more The most important reaction of the CFCs is the photo-induced scission of a C-Cl bond: CCl3F → CCl2F + Cl See more Carbon tetrachloride (CCl4) was used in fire extinguishers and glass "anti-fire grenades" from the late nineteenth century until around the end of See more CFCs and HCFCs are used in various applications because of their low toxicity, reactivity and flammability. Every permutation of fluorine, chlorine and hydrogen based on … See more • Chlorofluorocarbons (CFCs): when derived from methane and ethane these compounds have the formulae CClmF4−m and C2ClmF6−m, where m is nonzero. • Hydro … See more CFCs were phased out via the Montreal Protocol due to their part in ozone depletion. The atmospheric … See more Because the time history of CFC concentrations in the atmosphere is relatively well known, they have provided an important … See more Webhigher altitudes, either by molecular oxygen, 02, or by stratospheric ozone, 03. The chlorofluorocarbons are subject to destruction only after they rise by random diffusion to alti tudes of 25 to 40 km, above most of the molecular oxygen and ozone. The same stratospheric ozone which protects Homo sapiens and other living species from su tong pae bridge