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Answer to #4:

ClO + ClO + any air molecule -> Cl2O2 + any air molecule
Cl2O2 + hv -> Cl + ClO2
ClO2 + any air molecule -> Cl + O2 + any air molecule
then: 2 x (Cl + O3) -> 2 x (ClO + O2)

 net: 2 O3 -> 3 O2

and

ClO + BrO -> Br + Cl + O2
Cl + O3 -> ClO + O2
 Br + O3 -> BrO + O2

net: 2 O3 -> 3 O2

Information found at:  http://www.atm.ch.cam.ac.uk/tour/part3.html The catalysts in these reactions are either the Cl or Br molecules and the bad thing is that these molecules are ALWAYS reproduced at the end of the reaction therefore they find other ozone molecules to react with and destroy and the Cl and Br is never lost.