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Module 4 - Chapter 15 - Haloalkanes - Coggle Diagram
Module 4 - Chapter 15 - Haloalkanes
Ozone layer
Outer edge of stratosphere
Absords most biologically damaging uV radition (UV-B)
UV-B radiaiton is the radiation most commonly linked to sunburn
Depletion of the ozone layer allows more UV-B through the atmostphere
Ozone is continually being formed and borken down by UV radiaiton
High energy UV breaks down oxygen molecules into oxygen radicals
Steady state is set up involving O2, and oxygen radicals where ozone forms and breaks down
CFCs
Chlorofluorocarbons
Originally used as refirgernats, in AC units and aerosol propellants
Very stable due to the strength of the carbon-halogen bond within their molecules
CFCs break down in the stratosphere forming chlorine radicals with catalyse the breakdown of the ozone layer
UV radiation provides enough energy to break a carbon-halogen bond by homolytic fission
Initiation
Chlorine radical is very reactive
Propogation
A chlorine radical is regenerated and can remove another molecule of ozone
Overall equation
Nitrogen oxide radicals
Other radicals catalyse the breakdown of ozone too
Nitrogen oxide radicals are formed naturally during lightning strikes and aircraft travel in the atmostphere
Propogation
Overall equation
Same as with chlorine radicals
