"Chlorofluorocarbons and the Ozone Layer

Question 1

What is the problem with UV radiation?

Answer 1

= damage DNA- skin cancer

Question 2

What is the ozone layer?

Answer 2

= contains high concentration of ozone
= O3- absorbs uv from

Question 3

How does the ozone layer do this?

Answer 3

= Uv radiation causes the double bonds in oxygen to break
= 2 oxygen free radicals
= reacts with oxygen molecule (o2) forms ozone
= can absorb UV light turning back into a oxygen radical and a oxygen molecule
= same rate broken down and formed remains constant

Question 4

What are chloroflurocarbons CFC?

Answer 4

= CFCl3
= haloalkanes- stable
= high bond enthalpy+ non toxic
= UV causes carbon to chlorine bond to break
= photodissociation
=

Question 5

What happens in propgation step 1?

Answer 5

= a chlorine free radical reacts with ozone
= forms chlorine monoxide free radical and oxygen

Question 6

What happens in propgation step 2?

Answer 6

= chlorine monoxide free radical reacts with oxygen radical
= chlorine radial + oxgen molecule

Question 7

What are hydroflourocarbons used for?

Answer 7

= used for refrigerators
= air conditionings
= safer as they do not contain the c-cl bond, so no chlorine free rasicals

Question 8

What is the problem with cfc’s?

Answer 8

= the carbon to chlorine bond- the chlorine regernated free radical produced aswell
= destruction of thousands of ozone molecules