DJA extra to mechanisms). Ozone depletition Flashcards
1
Q
chemical symbol for ozone
A
O3
2
Q
How and where is ozone formed
A
In the stratosphere
O2 —-> Odot + Odot
Odot + O2 —-> O3
3
Q
where do CFCs come from
A
used to be
- fridge
- aerosols
4
Q
which mechanism depletes ozone
A
free radical substitution
5
Q
initiation of ozone depletition
A
CFC —-> CFC with a free radical + Cldot
6
Q
propagation steps of ozone depletition
A
dotCl + O3 –> dotClO + O2
dotClO + O3 —> dotCl + 2O2
7
Q
a sngle Clfree radical reacts with….
A
approx. 100,000 O3
8
Q
what safely replaced CFCs and why better
A
HFCs
less stable so don’t end up in stratosphere, instead end up in rain water
9
Q
how does ozone naturally break down
A
O3 + Odot —> 2O2
10
Q
why is it okay that ozone naturally breaks down
A
because it is 1,500 times slower than O3 + dotCl
11
Q
which protocol banned CFCs
A
Montreal Protocol 1987
