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