OZONE DEPLETION

Question 1

ozone

Answer 1

ozone in the upper layer acts as a chemical sunscreen
it absorbs a lot of uv radiation from the sun
O3

Question 2

what happens without ozone

Answer 2

UV reaches earth which can cause skin cancer, cataracts in the eye, damage to plant tissue and reduce plankton population in the ocean

Question 3

how is the ozone being destroyed

Answer 3

chlorine radicals are formed in the upper atmosphere when UV radiation causes the C-Cl bonds in chloroflurocarbons to break
chlorine radicals catalyse the decomposition of ozone and contribute to the hole in the ozone layer

Question 4

why does the C-Cl bond break and not the C-F bond

Answer 4

C-Cl bond is weaker than the C-F bond
the C-Cl bond enthalpy is less than for C-F

Question 5

equations for the depletion

Answer 5

chlorine free radical reacts with o3
chlorine free radical is reformed by reacting with more ozone molecules
leads to a hole in the ozone layer

Question 6

how do the equations show chlorine radical acts as a catalyst

Answer 6

regenerated at the end of the reaction
unchanged at the end
hasnt been used up

Question 7

montreal protocol

Answer 7

essential agreement to phase out CFCs by 200 countries
chemists have developed safer alternatives to CFCs which contain no chlorine

Question 8

halogenated organic compounds contribution to global warming

Answer 8

trap much more heat in the atmosphere than most other known compounds
absorb infrared radiation emitted by earths surface
polar molecules