An example of a refrigerant CFC is dichlorodifluoromethane, CF 2 Cl 2 (also known as CFC-12) , which boils at -30°C. Another once-common CFC is trichlorofluoromethane, CFCl 3 (CFC-11), which boils at 24°C and was once the propellant in around half of all the aerosol cans used in the world.
What are examples of CFCs quizlet?
(CFC) Organic compounds made up of atoms of carbon, chlorine, and fluorine. An example is Freon -12 (CCl2F2) , which is used as a refrigerant in refrigerators and air conditioners and in making plastics such as Styrofoam.
What are CFCs give examples?
- a) Refrigerators and air conditioners – Refrigerants are the most common emitter of CFC. ...
- b) Aircraft halon – Aviation industries in some countries are still using fire suppression system with halon. ...
- c) Aerosol sprays – Aerosol cans and propellant liquid use gases containing CFCs.
What products contain CFCs?
- Refrigerants for refrigerators, automobiles and air-conditioners.
- Cleaning agents for semi-conductors and precision parts.
- Foaming agents for insulating materials and packing cushions.
- Propellants for aerosol sprays.
What are the most common CFCs?
The most common representative is dichlorodifluoromethane (R-12 or Freon-12) . Many CFCs have been widely used as refrigerants, propellants (in aerosol applications), and solvents.
Can CFCs be removed?
As CFCs have no significant tropospheric removal process , but are rapidly photolysed above the lower stratosphere, the timescale for their removal is set mainly by the rate at which air is transported from the troposphere into the stratosphere 2 .
What replaced CFCs?
HFCs , which originally were developed to replace CFCs and HCFCs, also absorb and trap infrared radiation or heat in the lower atmosphere of the earth. HFCs, CFCs and HFCs are a subset of a larger group of climate changing gases called greenhouse gases (GHGs).
Why do we use CFCs?
Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays , blowing agents for foams and packing materials, as solvents, and as refrigerants.
What three elements are found in chlorofluorocarbons quizlet?
- CFCs are organic molecules that contain 3 elements: carbon, chlorine and fluorine.
- CFCs are both non. ...
- In water CFCs are. ...
- CFCs have a low. ...
- CFCs were used in. ...
- In 1974 discovered the truth behind CFCs which was that. ...
- In 1985 scientists found evidence of. ...
- The symbol for ozone is.
How do CFCs relate to ozone quizlet?
how does Chlorofluorocarbons (CFC’s)affect ozone depletion? , CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing the chlorine that catalytically destroys ozone . You just studied 12 terms!
How can we reduce CFCs?
Buy air-conditioning and refrigeration equipment that do not use HCFCs as refrigerant. Buy aerosol products that do not use HCFCs or CFCs as propellants. Conduct regular inspection and maintenance of air-conditioning and refrigeration appliances to prevent and minimize refrigerant leakage.
Are CFCs toxic to breathe?
Inhaling CFCs
Inhalation of CFCs can also disturb the heart rhythm, which can lead to death. Exposure to large amount of CFCs could potentially cause asphyxiation , according to the Centers for Disease Control and Prevention.
What are CFCs class 9th?
Chlorofluorocarbon(CFC) is any of various halocarbon compounds consisting of carbon, hydrogen, chlorine, and fluorine . CFC were once used widely as aerosol propellants and refrigerants. Chlorofluorocarbons are believed to cause depletion of the atmospheric ozone layer.
Are CFCs legal?
CFCs are Class I ODS , while HCFCs are Class II ODS. EPA regulations ban these products from sale and distribution in interstate commerce in the United States. Banned products also cannot be incorporated into larger products (e.g., packaging material).
Why are CFCs used as refrigerants?
Chlorofluorocarbons (CFCs)
Their other important property is their volatility , having boiling points close to zero degrees Centigrade. These physical properties make them ideal for use as refrigerant gases in air conditioners, freezers and refrigerators.
Why are CFCs used as aerosol propellants?
Refrigeration. CFCs were developed as nonflammable and nontoxic alternative to dangerous elements like ammonia for use in refrigeration and as spray can propellants. CFCs remain suspended in the atmosphere for decades.
