bozeman science - stratospheric ozone
CFCs are composed of
3 chlorine atoms, 1 fluorine atom, and 1 carbon atom
ozone
O3
solar breakdown
O3 + UV -> O2 + O O + O3 -> 2O2
stratospheric ozone is also called
'good' ozone
one chlorine atom can break down _ ozone atoms
100,000
diatomic oxygen
O2
solar formation
O2 + UV -> 2O O + O2 -> O3
_ is required for the production of ozone
UV radiation
most _ radiation is filtered out by the ozone layer and all of _ radiation is filtered out
UVB ; UVC
the ozone layer especially protects us from
UVC radiation
when CFCs are hit by radiation,
a chlorine atom breaks off that binds to oxygen atoms and breaks down ozone
the montreal protocol was
a treaty that countries signed to stop using CFCs
sunscreen will
absorb ultraviolet radiation to protect us
chlorine acts as
an enzyme to break down ozone
UVA UVB UVC is listed in order of
ascending (increasing) energy and descending wavelength
example of UVA radiation
black light
after industrialization,
chemicals like CFCs that release chlorine into the air destroyed ozone
CFCs stands for
chlorofluorocarbons
stratospheric ozone is formed when
diatomic oxygen absorbs an ultraviolet photon and is split into two free oxygen atoms, which bond with another diatomic oxygen molecule to form an ozone molecule and a stable ozone layer
CFCs examples
freon and aerosols
the ozone hole formed on the pole because
it is an area that does not receive very much sunlight so ozone levels could not build themself back up
before the formation of the ozone layer,
life could not exist on land (only in the oceans)
tropospheric ozone can lead to
lung irritation and cancer
UVC is the
most damaging form of ultraviolet radiation
large amounts of ozone are located
near the surface of the earth and 20-30 kilometers up (in the stratosphere)
UVA radiation is
not too damaging
_ people will show more skin damage due to UV radiation
older
the ozone hole is located
over the south pole
stratospheric ozone forms the
ozone layer
stratospheric ozone
protects humans from ultraviolet light
when UVC radiation is hit,
regular oxygen forms ozone (a feedback cycle in which sunlight produces ozone)
UVA radiation will move
right through the ozone layer
the ozone hole issue was fixed with
the passing of the montreal protocol in 1989 to limit CFCs
ozone is found in
the troposphere as a pollutant ('smog ozone') and the stratosphere