3.3.3.3 Ozone depletion Flashcards
1
Q
How do chlorine atoms catalyse
the decomposition of ozone?
A
Cl• + O3 → ClO• + O2
and ClO• + O3 → 2O2 + Cl•
Overall: 2O3 = 3O2
2
Q
What is the purpose of the ozone?
A
It absorbs ultra violet radiation
3
Q
Why do CFCs damage the ozone?
A
Chlorine atoms are formed in the upper atmosphere
when ultraviolet radiation causes C–Cl bonds in
chlorofluorocarbons (CFCs) to break
Chlorine atoms catalyse the decomposition of ozone
4
Q
What were CFCs replaced by?
A
HCFCs: less reactive so it doesn’t break and damage the ozone
