The correct answer is D. CFCs are used as refrigerants, insulators, and aerosol propellants.
CFCs, or chlorofluorocarbons, are a group of man-made chemicals that were once widely used in refrigerators, air conditioners, and aerosol cans. However, it was discovered that CFCs are very harmful to the environment, as they contribute to the depletion of the ozone layer. As a result, the use of CFCs has been banned in most countries.
CFCs are used as refrigerants because they are very effective at absorbing and releasing heat. This makes them ideal for use in refrigerators and air conditioners, which need to be able to maintain a constant temperature. CFCs are also used as insulators, as they are very good at preventing heat from escaping. This makes them useful for insulating buildings and other structures. Finally, CFCs are used as aerosol propellants, as they are very effective at pushing a liquid or powder out of a container.
While CFCs have many useful properties, they are also very harmful to the environment. CFCs are released into the atmosphere, where they break down and release chlorine atoms. These chlorine atoms react with ozone molecules in the stratosphere, destroying them. Ozone is a layer of gas in the stratosphere that protects the Earth from harmful ultraviolet radiation. The depletion of the ozone layer has led to an increase in the amount of ultraviolet radiation reaching the Earth’s surface, which has a number of negative effects on human health and the environment.
As a result of the harm they cause to the environment, the use of CFCs has been banned in most countries. However, CFCs are still used in some applications, such as in some medical devices. CFCs are also still found in old refrigerators and air conditioners. When these appliances are disposed of improperly, the CFCs they contain can be released into the atmosphere.
It is important to recycle or properly dispose of old appliances that contain CFCs. You can find information on how to do this by contacting your local waste management company or environmental protection agency.