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ENSC Final Exam Prep Questions Solved 100% Correct| Verified
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ENSC Final Exam Prep Questions Solved100% Correct| Verified
• Describe the process that takes a CFC to free chlorine (know and understand order of steps): -
✔✔o Cl2 = chlorine gas
o CFC = chlorofluorocarbon
o Cl = free chlorine
o ClO = chlorine monoxide
o CRS = chlorine reservoir species
o PSC = polar stratospheric cloud
o 1. CFC is emitted in troposphere
o 2. CFC migrates to the stratosphere
o More UV in stratosphere which breaks up CFC's -> (Transforms) CRS (chlorine reservoir
species) (HcCl, ClONO2)
o CRS -> to either pole through high level winds
o 3. Wintertime at the poles = zero sunlight & no sunlight = PSC (polar stratospheric cloud,
created by polar vortex)- within the PSC you have the ice crystals that contain nitrogen
o CRS sticks to the nitrogen ice crystals
o 4. Reacts with nitrogen on the ice crystal
o 5. CL2 comes off: Chlorine gas made up of two chlorine atoms
o 6. once spring time occurs, then you get two free chlorine
, The 2 free active chlorine atoms then works its way back into the ozone bonding with ozone
molecules causing ozone depletion
o It will ask CFC to Cl2, and then CL3 to O3 depletion
(Cl + O3 -> ClO = O2 ClO + O3 -> 2O2 + Cl
Chemical formations of CFCs reaching ozone depletion - ✔✔MigrateN2strata: CFC-> HcCl &
ClONO2
MigrateN2poles: HcCl & ClONO2 + N2-> Cl2
Cl2 + hv-> Cl
Cl migrates back into ozone:
-Cycles repeats
Cl + O3-> ClO O2 ClO + O3 -> 2O2 + Cl
Description:
CFC emitted
CFC migrates into Strato transforming into Chlorine res species:
CFC-> HcCl and ClONO2
Moves into poles then from climate implications HcCl and ClONO2 are reacted with N2 forming
Cl2 -
HcCl and ClO2-> Cl2
Cl2 reacts with sunlight HV forming free chlorine - Cl
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