Chlorofluorocarbons Have Been Banned Due to Which of the Following

Man-made compounds such as chlorofluorocarbons CFCs hydrofluorocarbons HCFCs and halons destroy ozone in the upper atmosphere stratosphere. This deterioration has been attributed to the atmospheric release of certain man-made halocarbons including chlorofluorocarbons CFCs halons methyl chloroform and carbon tetrachloride.

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Chlorofluorocarbons CFCs are a group of odourless manufactured chemicals.

. C Aerosol sprays Aerosol cans and propellant liquid use gases containing CFCs. CFCs have been banned in several nations since 1996 to prevent Ozone layer depletion. The stratospheric ozone layer makes life possible by shielding the earth from harmful ultraviolet UV-B rays generated from the sun.

When CFCs are released into the atmosphere they are not broken down immediately but are transported into the stratosphere where they are eventually broken down by UV radiation. The return of the ozone layer following the CFC ban has served to protect plants ability to soak up and lock in carbon dioxide from the atmosphere. Research has identified CFCs and HCFCs as the primary ODS National Academy of Sciences 1982.

Because they damage the earths ozone layer CFCs have been banned since 1996. CFCs reach the stratosphere because of their chemical properties. See answer 1 CFCs were banned because in the upper atmosphere they can decompose ozone under the impact of ultraviolet radiation which is stronger there to form free radicals which then.

Earth Sciences questions and answers. Where ozone depletion has been most severe due to very low temperatures is expected to recover much more slowly. That stratospheric ozone absorbs ultraviolet radiation that otherwise would reach the surface of Earth.

CFCs atmospheric effects on the other hand are not limited to their position as ozone-depleting chemicals. They have been introduced as temporary replacements for CFCs and are also greenhouse gases. CFCs take part in the destruction of atomospheric ozone.

Due to the high alertness and awareness regarding ozone layer depletion and to reduce the harmful effects of Chlorofluorocarbons on the environment several active on-charge groups are coming forward to dispose of CFCs from the surroundings. Led by NASA Goddard scientist Paul Newman a team of atmospheric chemists simulated what might have been if chlorofluorocarbons CFCs and similar ozone-depleting chemicals were not banned through the Montreal Protocol. The destruction of ozone by ozone-depleting substances ODS has been recognised since 1974.

Decreased concentration of stratospheric ozone allows. See ozone depleting substance. However the accumulation of CFCs in the stratosphere that may be linked to ozone depletion has generated considerable public debate and has led to legislation and international agreements such as the Montreal Protocol and its amendments signed by 148 countries that banned the production of most CFCs by the year 2000.

CFCs under commercial uses as refrigerants and blowing agents include trichlorofluoromethane CFC-11 dichlorodifluoromethane CFC-12 112-trichloro-122-trifluoroethane CFC-113 12-dichlorotetrafluoroethane CFC-114 and. B Aircraft halon Aviation industries in some countries are still using fire suppression system with halon. These compounds are banned since 1996 as per the guidelines of the Montreal Protocol due to the damage in the ozone layer of the earth.

There is a cause-and-effect relationship involving CFCs and ozone depletion. Sources of CFC. The comprehensive model including atmospheric chemical effects wind changes and solar radiation changes simulated what.

Because of their role in ozone depletion CFCs were phased out under the Montreal Protocol. While use of CFC-12 in new vehicles has been banned since 1994. Depletion of the Ozone Layer will have a negative impact on the biodiversity of the earth itself.

CFCs are Class I ODS while HCFCs are Class II ODS. Chlorofluorocarbons have been banned from use as aerosols as well as many other ozone depleting chemicals. The hydrofluorocarbons HFCs are a better substitute for CFC and HCFC.

The CFCs were widely used as they were non-toxic and non-flammable and convert readily to gas from a liquid and vice versa. CFCs or chlorofluorocarbonswere once used as refrigerants but were banned due to their role in the depletion of ozone in our upper atmosphere. Chlorofluorocarbons and Ozone Depletion.

The evaporation of CFCs can be used to drive the freezing of liquid water. EPA regulations ban these products from. Although ozone depleting substances they are less potent at destroying stratospheric ozone than chlorofluorocarbons CFCs.

Rowland a professor of chemistry at the University of California Irvine and Molina a postdoctoral fellow in Rowlands laboratory had shown that chlorofluorocarbonsCFCscould destroy ozone a molecule made up of three oxygen atoms O 3 in Earths stratosphere. Chlorofluorocarbons CFCs cause significantly stratospheric ozone depletion and global warming relating to the greenhouse effect. A Refrigerators and air conditioners Refrigerants are the most common emitter of CFC.

Once used extensively as propellants more for aerosol sprays but generally banned for such purposes since 1978 CFCs are widely used today as refrigerants foams and. Which of the following statements concerning chlorofluorocarbon CFC is FALSE.

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