Organic topic(Ozone)

Question 1

What is the ozone layer, how does ozone act

Answer 1

oute edge of the stratosphere 10-40 km above the earth, small number of ozone but it is enough to absorb most UV from the earths surface

Question 2

How is ozone formed

Answer 2

o2-> 2o.
o2 + o. -> o3

Question 3

How do CFCs act

Answer 3

they upset the equilibrium of formation of o3 by breaking it down

Question 4

What are the properties of CFCs

Answer 4

chlorofluorocarbons are stable, volatile, non-flammable, non-toxic and has many uses

Question 5

why are CFCs so stable

Answer 5

strong C-H bond

Question 6

when does CFC stability falter

Answer 6

when the CFCs enter the stratosphere the UV radiation is strong enough to break down the C-CL bonds

Question 7

What is the equation of the breakdown of a CFC

Answer 7

CF2Cl2-> Cl. +CF2Cl

Question 8

what are the propagation steps of cl. reaction with o3

Answer 8

cl. + o3 -> clo. + o2
clo. + o -> cl. + o2

Question 9

In the reaction of cl. with o3 why is the second step important

Answer 9

more cl. radicals are produced which can then attack more o3 molecules continues the cycle

Question 10

show the mechanism for NO reaction with o3

Answer 10

NO. + O3 -> NO2. + o2
NO2+ O. -> NO. + O2

Question 11

what is the overall equation for the ozone reactions

Answer 11

o3+O -> 2o2

Question 12

What are the alternatives to CFCs

Answer 12

HCFCS are being used while safer products are being produced
Hydrocarbons used
HCFCS break down in 10-20 years but are less harmful than CFCs
HCF does not contain cl so cannot break down radicals

Question 13

What is the reaction of OH with o3

Answer 13

OH. + O3 -> O2H. + O2
O2H + O -> OH. +O2

Question 14

What kind of bonds can absorb IR radiation

Answer 14

C=O, C-H, O-H