ozone layer Flashcards
1
Q
what is the condition for forming the ozone layer
A
UV light - free radical subsititution
2
Q
ozone breakdown mechanism
A
initiation:
CCl3F —> Cl. + .CCl2F
propagation
Cl. + O3 —> ClO. + O2
ClO. + O3 —> 2O2 + Cl.
3
Q
Why are CFC’s so damaging to the ozone layer
A
one Cl. can cause the breakdown of ozone because
- Cl. is regenerated in final propagation step (1)
- causes a chain reaction in decomposition of ozone (2)
4
Q
why does 1,1,1-trifluoroethane (CF3CH3) not lead to the depletion of the ozone in the upper atmosphere
A
-1,1,1-trifluoroethane doesn’t release chlorine
- C-F bonds are strong and do not break
5
Q
what does Cl. act as in ozone breakdown mechanism
A
catalyst
