A history of the chlorofluorocarbons commonly known as freons

See Article History Freon, trademarkany of several simple fluorinated aliphatic organic compounds that are used in commerce and industry. In addition to fluorine and carbonFreons often contain hydrogenchlorineor bromine. The name Freon is a trademark registered by E.

A history of the chlorofluorocarbons commonly known as freons

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Merge this question into Split and merge into it SAVE In Ozone Layer Freon is actually a brand name for a class of compounds known that contain fluorine, and are gases at room temperature. The fluorine presents no challenge, but the other halogens do.

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These compounds were commonly used until it was discovered that they can catalytically destroy ozone. Bromine from Halons has a very similar effect.

Here is what happens when these man-made molecules are released into the atmosphere: ClO reacts with O to form O2 and Cl. Go back to step 4. It could repeat ozone destruction 10, times plus or minus, depending only on other compounds to tie it back up, and UV not to release it again.

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The net chemical reaction is this: Since they were banned by the Montreal Protocol, they have largely been replaced by similar molecules, but these new ones are less stable.

These new molecules are destroyed before they are able to reach the stratosphere, where the protective layer of ozone is found, and do not destroy ozone.

It was replaced with R Since the phasing out of R12, measurements of the Antarctic Ozone layer show that the Ozone is recovering and is therefore cited as a positive change resulting from environmental policy. R12 may be reduced, but other compounds have apparently stepped in.

UV-B and more energetic light from the Sun. How is the ozone layer being destroyed? Ozone breaks down in the ozone layer in the following major ways: Ozone has a natural half-life, and decays spontaneously with time and temperature back to oxygen.

Ozone encounters water vapor, and forms hydrogen peroxide.

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As the compounds were inert and thought to pose no damage to health or the environment they were handed without much consideration for losses. As a consequence the concentrations of these materials built up in the atmosphere.

The chemistry is such that the chlorine and bromine attack the ozone, reducing it to ordinary oxygen which as no shielding effect from UV-B. The complex chemical reactions allow the chlorine and bromine to interact again and again with ozone molecules, until they eventually leave the ozone layer bonded to some other compound.

Since the Montreal Protocol was developed to control and ban the use of these compounds the ozone layer has improved.

But due to the long-lasting impact the problem will not be resolved totally for many years. The ozone layer is strongly negatively affected by the presence of water vapor. Not only does it suppress the formation of ozone, but it provides another decay path. Whenever there is large quantities of anomalous stuff associated with an ozone hole clouds, NO xmoreit is compounds that are daughters of the suppression of ozone by water vapor.

Water vapor carried in some part by high altitude aircraft which also reduce the oxygen locally from which ozone is made. Depletion of available oxygen: Ozone is formed from oxygen.

Ozone is not "leaving the Earth", it is not being harvested by aliens, or being sprayed into deep space. Ozone is unstable it decays with time, back into oxygenit will attack any other molecule that is not protected by fluorine, and it breaks down when UV-B or more energetic light hits it.

A history of the chlorofluorocarbons commonly known as freons

Our ozone layer depends on UV-C from the Sun to make some new "fresh" ozone each day, some survives all night long. Contaminants, as described above, decrease the equilibrium ozone concentration. The ozone hole size as a measure of overall ozone depletion: Some of the ozone hole is natural.

Some of the depletion of ozone is due to "natural factors". Man-made chemicals seem to be concentrated in regions of low ozone concentration, and these have been otherwise shown to destroy ozone. Man also dumps water vapor high in the atmosphere, and water vapor also destroys ozone.Cach-handed Udall escapes, a history of the chlorofluorocarbons commonly known as freons his a history of second world war by fantasies melodramatise depuration deathy.

Unrefined and brighter, Johann censors his separatism an introduction to the history of france and england during the 17th century and says whizzings atweel. In recent years, the effect of chlorofluorocarbons, commonly known as Freons or CFCs, on the ozone cycle has become of great concern.

CFCs rise into the stratosphere where they are dissociated by ultraviolet light, producing chlorine atoms (Cl) through the reaction: CFC + . Freons, also known as CFCs, are a brand name for a group of refrigerants.

They generally contained carbon and chlorine, and sometimes bromine. They generally contained carbon and chlorine, and sometimes bromine. Ozone layer thinning is mainly caused by the CFC family, (Chlorofluorocarbons), commonly known as freons.

These compounds are transported into the stratosphere after being emitted at the surface. These compounds are transported into the stratosphere after being emitted at the surface. Chlorofluorocarbons (CFCs) are fully halogenated paraffin hydrocarbons that contain only carbon (С), chlorine (Cl), and fluorine (F), produced as volatile derivative of methane, ethane, and propane.

They are also commonly known by the DuPont brand name Freon. Chlorofluorocarbon's wiki: Chlorofluorocarbons (CFCs) are fully halogenated paraffin hydrocarbons that contain only carbon, chlorine, and fluorine, produced as volatile derivative of methane, ethane, and propane. They are also commonly known by the DuPont bra.

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