WebCompounds that contain C-H bonds are not stable enough and are destroyed in the troposphere, while compounds that contain no chlorine can not be a source of Cl atoms. … WebApr 5, 2024 · CFCs are useful solvents due to their polarity, and their boiling points make them ideal as refrigerants. CFCs are less flammable than methane, in part because …

5.4 Refrigerant types - SWEP

WebJul 16, 2008 · At the poles, CFCs attach to ice particles in clouds. When the sun comes out again in the polar spring, the ice particles melt, releasing the ozone-depleting molecules from the ice particle surfaces. Once released, these ozone-destroying molecules do their dirty work, breaking apart the molecular bonds in UV radiation-absorbing ozone. WebFeb 20, 2014 · The possibility of rapidly increasing use of CFC-22 suggests a need for careful atmospheric monitoring, especially as the atmospheric lifetime of CFC-22 is long but uncertain (12-28 yr (refs 3, 5 ... caleigh bird art

Student Sheet 1 - National Oceanic and Atmospheric …

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 The chlorine atom, … 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 World War II. Experimentation with chloroalkanes for fire suppression on military aircraft began at least as early as … 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 constraint on ocean circulation. CFCs … See more Web• Remaining bonds not accounted for are occupied by chlorine atoms. All of these refrigerants are saturated; that is, they contain only single bonds. The number of bonds available in a carbon-based molecule is 2C + 2 (i.e. for 1 carbon atom, there are 4 bonds; for 2 carbon atoms there are 6 bonds and for 3 carbon atoms there are 8 bonds). WebCFC-114. Dichlorotetrafluoroethane, or CFC-114 (molecular formula C2Cl2F4), is a pollutant with refrigerant properties. The EPA lists CFC-114 as a Class I Ozone-depleting … coachflix