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3.3.3.3 Ozone depletion
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Total cards: 4•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (4)
#1
Front (Question)
How do chlorine atoms catalyse the decomposition of ozone?
Back (Answer)
Cl• + O3 → ClO• + O2 and ClO• + O3 → 2O2 + Cl• Overall: 2O3 = 3O2
#2
Front (Question)
What is the purpose of the ozone?
Back (Answer)
It absorbs ultra violet radiation
#3
Front (Question)
Why do CFCs damage the ozone?
Back (Answer)
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
Front (Question)
What were CFCs replaced by?
Back (Answer)
HCFCs: less reactive so it doesn’t break and damage the ozone