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16 Cards in this Set
- Front
- Back
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bad ozone v good
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bad - troposphere
(smells/pollutant/strong oxidant) good-stratosphere (don't breath it - benefit from its absorbing) |
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why ozone peaks in stratosphere
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O2 + UV light --> O + O
2O + 2O2 --> 2O3 NET: 3O2 + UV --> 2O3 **u need 1/2 O2 to form one O3 |
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only mechanism to produce O3
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O2 and UV
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why stratosphere just right
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o2 pressure decreases goign up in alt
uv light decreasing going down in altitude |
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ozone destroyed by photolysis
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o3 + UV --> O + O2
O + O3 --> 2O2 NET: 2O3 + UV --> 3O2 (how o3 filters UV) |
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chapman mechanism (regulatory?)
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o2 + UV -> O + O
O + O2 --> O3 O3 + UV --> O + O2 O + O3 --> 2O2 |
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threats to ozone layer
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catalytic reactions (radicals)
NO, NO2, Cl, ClO |
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catalyst
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speeds up reaction
by lowering activation energy needed not consumed by reaction |
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radial
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unpaired valence -- odd number of valence
make them highly reactive |
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sources of NO in strat
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planes
lightning |
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NO shortlived bc
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is a radical
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on molecules move into strat
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if VERY stable
(ie radicals must be formed or injected in strat to get there) |
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lightning source of NO
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convert N2 to NO
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longlived species in top can enter strat
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main form of NO in strat
N2O transported from trop to strat ... then react with UV to form NO |
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ozone loss from Cl
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catalyst
primary source: CFC |
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montreal protocol
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ban on substances that decrease ozone layer
(disc antarctic ozone hole during this time) |
