Ozone depletion is the term commonly used to describe the thinning of the ozone layer in the stratosphere. Ozone Depetion is caused by the release of Chlorofluorocarbons (CFC’s), hydroflurocarbons (HCFC’s) and other ozone-depleting substances (ODS) which are popularly used as refrigerants, insulating foams, and solvents. CFC’s and HCFC’s are carried to the stratosphere in a process that can take as long as 2 to 5 years. When they reach the stratosphere, the ultraviolet radiation from the sun causes them to break apart and release chlorine atoms which react with ozone, and start chemical cycles of ozone destruction the deplete the ozone layer.
Other chemicals that damage the ozone layer include methyl bromide (pesticide), halons (used in fire extinquishers), and methyl chloroform (solvent). As methyl bromide and halons are broken apart, they release bromine atoms, which are 60 times more destructive to ozone molecules than chlorine atoms.
Fun Fact!
Uses of CFCs in manufacturing include: aerosol sprays, blowing agents for foams, solvents, and refrigerants.
Other chemicals that damage the ozone layer include methyl bromide (pesticide), halons (used in fire extinquishers), and methyl chloroform (solvent). As methyl bromide and halons are broken apart, they release bromine atoms, which are 60 times more destructive to ozone molecules than chlorine atoms.
Fun Fact!
Uses of CFCs in manufacturing include: aerosol sprays, blowing agents for foams, solvents, and refrigerants.
Process
- 1. Ultraviolet radiation from the sun strikes the CFC molecule and causes a Chlorine atom to break away
2. The chlorine atom reacts with ozone molecule to form chlorine monoxide and diatomic oxygen
3. When a free atom of oxygen reacts with a chlorine monoxide molecule, diatomic oxygen is formed and the chlorine atom is released to destroy more ozone.