DJA extra to mechanisms). Ozone depletition Flashcards Preview

Chemistry > DJA extra to mechanisms). Ozone depletition > Flashcards

Flashcards in DJA extra to mechanisms). Ozone depletition Deck (11):
1

chemical symbol for ozone

O3

2

How and where is ozone formed

In the stratosphere
O2 ----> Odot + Odot
Odot + O2 ----> O3

3

where do CFCs come from

used to be
-fridge
-aerosols

4

which mechanism depletes ozone

free radical substitution

5

initiation of ozone depletition

CFC ----> CFC with a free radical + Cldot

6

propagation steps of ozone depletition

dotCl + O3 --> dotClO + O2
dotClO + O3 ---> dotCl + 2O2

7

a sngle Clfree radical reacts with....

approx. 100,000 O3

8

what safely replaced CFCs and why better

HFCs
less stable so don't end up in stratosphere, instead end up in rain water

9

how does ozone naturally break down

O3 + Odot ---> 2O2

10

why is it okay that ozone naturally breaks down

because it is 1,500 times slower than O3 + dotCl

11

which protocol banned CFCs

Montreal Protocol 1987