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They absorb infrared radiation
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∙ 11y ago
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What can we do to reduce CFC's?
The Montreal Agreement of September 16, 1987, laid down rules for the phasing out of the production and use of CFCs (chlorofluorocarbons). Every country in the world agreed and ratified this, the only time this has happened in history. There are now no CFCs in use (except perhaps in the air conditioners of very old cars), or production (unless a rogue state or company is producing them illegally). CFCs were replaced in most cases by HCFCs (hydrochlorofluorocarbons), which were not so dangerous for the ozone layer. The Montreal Agreement was extended to phase out HCFCs by 2015. CFCs and HCFCs have now been replaced by HFCs (hydrofluorocarbons) which do not contain chlorine, and so do not destroy ozone. However, CFCs are dangerous greenhouse gases, much more potent than carbon dioxide, so their threat to global warming is very real. Scientists are now looking for a safer option to HFCs. There are still levels of CFCs in the atmosphere, which may lead to ozone layer depletion, and further leading to loss of lives on earth due to skin cancer, etc. caused by the ultra-violet radiation.
What are HFCs?
HFC's are Hydro fluorocarbons that are used as refrigerants. They are considered to be ozone destroyers.
What gases are the main greenhouse gases and how they are upsetting the Earth and also demonstrate using chemical reactions?
Many chemical compounds present in Earth's atmosphere behave as 'greenhouse gases'.The natural GHGs are:carbon dioxidemethanewater vapornitrous oxideThe artificial or man-made GHGs are:chlorofluorocarbons (CFCs)hydrofluorocarbons (HFCs)Perfluorocarbons (PFCs)sulfur hexafluoride (SF6).There is no chemical reaction which allows them to increase the retention of solar energy, just physical absorption and release of heat. This process allows the Earth's atmosphere to heat up.
What does HFCs stand for?
Hydro Fluoro CarbonsHousehold Finance CorporationHighest Common FactorHybrid fibre-coaxial (HFC)
How long do CFC molecules remain in the atmosphere?
500 years
How do you get rid of cfcs?
By using HFCs ,that is , hydroflourocarbon.
Which refrigerant decomposes at altitudes causing very little chlorine to reach the stratospheric ozone layer- CFCs- HFCs- Ammonia or HCFCs?
CFC's
What are the gases in refrigerators except CFCs?
HCFCs (Hydrochloroflourocarbons) and HFCs (Hydroflourocarbons). HCFCs are not as destructive to the ozone layer as CFCs are, as they are most reactive in the troposphere. Some of the chlorine still reaches the stratosphere, however, which is why HCFCs are being phased out via the Montreal Protocol. HFCs are not destructive to the ozone at all, however some of them are over 1000 times a more potent greenhouse gas than CO2. HFCs, while they may be safe for the ozone, contribute to global warming.
What is HFCS?
HFCS stands for high fructose corn syrup. There are two main types of HFCS used in foods and beverages: HFCS-55 and HFCS-42. The numbers represent the amount of fructose in the product. HFCS-55 is composed of 55% fructose with the rest mainly glucose. HFCS-42 is 42% fructose with the rest mainly glucose. HFCS-55 is equally sweet as sugar and is used in sodas and other carbonated beverages as a replacement for sugar. HFCS-42 is slightly less sweet and is used in condiments, dairy products and baked goods. High fructose corn syrup has 4 calories per gram, which is the same as other carbohydrates and caloric sweeteners like sugar, honey, fruit juice concentrates, fructose, etc.
What can we do to reduce CFC's?
The Montreal Agreement of September 16, 1987, laid down rules for the phasing out of the production and use of CFCs (chlorofluorocarbons). Every country in the world agreed and ratified this, the only time this has happened in history. There are now no CFCs in use (except perhaps in the air conditioners of very old cars), or production (unless a rogue state or company is producing them illegally). CFCs were replaced in most cases by HCFCs (hydrochlorofluorocarbons), which were not so dangerous for the ozone layer. The Montreal Agreement was extended to phase out HCFCs by 2015. CFCs and HCFCs have now been replaced by HFCs (hydrofluorocarbons) which do not contain chlorine, and so do not destroy ozone. However, CFCs are dangerous greenhouse gases, much more potent than carbon dioxide, so their threat to global warming is very real. Scientists are now looking for a safer option to HFCs. There are still levels of CFCs in the atmosphere, which may lead to ozone layer depletion, and further leading to loss of lives on earth due to skin cancer, etc. caused by the ultra-violet radiation.
What are HCFCs and what is their effect on the ozone hole and on global warming?
Hydrochlorofluorocarbons (HCFCs or Freon) are the replacement for chlorofluorocarbons (CFCs). The chlorine released from CFCs is very destructive of the ozone layer. HCFCs are less stable than CFCs and much of this gas breaks up before it reaches the lower stratosphere where the ozone layer is. However, some chlorine from HCFCs is still reaching and damaging the ozone layer. Other alternatives, hydrofluorocarbons (HFCs), which have no chlorine have been developed instead. These have no effect on the ozone layer. Unfortunately, one of the replacements, HFC-134a (aka R-134a), for example, used in automobile air conditioning units, is 1430 more powerful as a greenhouse gas than carbon dioxide (CO2).
Is r600a a replacement for r22?
It is an alternative to mostly banned CFCs (most infamous of which is R22), and to be phased out in the future HFCs (R410a, R134 and similar). That being said the general consensus is that R600a (isobutane) requires compressors/systems specifically designed for it. The most suitable HC or natural refrigerant substitute for R22 is R290, which although shunned by the industry will perfectly replace it with an efficiency increase of about 20% without any retrofitting or other adjustments.
What has been done to prevent the ozone layer from thinning?
Nothing? Nothing is done only by the Americans who are refusing to sign the Kyoto Protocol. (Correct me if I'm wrong) The simplest and most significant change is to cut off the use of ChloroFluoroCarbons (CFCs) and HydroChloroFluoroCarbons (HCFCs). They are inert and harmless at ground level but are detrimental to ozone molecules at the stratosphere. In fact, it is the Chlorine atom found in the CFCs and HCFCs that destroys the Ozone molecules. CFCs & HCFCs were mainly used in blowing agents, solvents and refrigerants in air-conditioners and refrigerators. They are now replaced by other substances such as HydroFluoroCarbons(HFCs). The HFCs do not contain any chlorine atoms and hence do not harm the ozone layer. Other substitutes are alkanes (such as ethane) and nitrogen gas. Thats what I learnt. Through live searches I found this; Hope it helped, Arshad.
How are chlorofluorocarbons made?
CFCs (chlorofluorocarbons) are not natural gases. They are completely made by man. Because they contain chlorine and bromine they began to destroy the ozone layer before they were banned. HCFCs were then used as a temporary measure as they were not so dangerous, but they are now being phased out in favour of HFCs, which do no damage to ozone.
Which gas is used for the air conditioner?
There are a number of different refrigerants used - typically, CFCs were used in older AC systems, and HFCs are much more common now. Many people refer to all refrigerants as Freon - this is a misnomer. Freon is a trademark name for a series of CFC and HFC refrigerants manufactured by DuPont.
Is sugar in HFCS?
yes it is, it is actually a huge part of it!
Does hfcs contain Mercury?
NO! it does not contain Hf-cs
