Ozone- mindmap 2
- Created by: Rebecca Neal
- Created on: 27-04-13 16:00
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- Ozone
- Chloromethane and bromomethane
- Both formed naturally from the oceans and forest fires.
- Most of these chemicals react and get used up in the troposphere, but some reach the stratosphere
- They can both then absorb UV radiation and split to form radicals.
- CH3Cl -> CH3 + Cl
- Cl + O3 -> ClO + O2
- ClO + O -> Cl + O2
- Cl + O3 -> ClO + O2
- The hole in the ozone layer
- Globally, measured concentrations of ozone are lower than expected.
- This suggests that ozone is being destroyed more quickly than it is being formed.
- Other reactions can destroy the ozone layer.
- Br radicals are about 150, 000 times more effective at destroying ozone than oxygen radicals.
- This means that the rate of destruction of ozone can be massively increased by very small concentrations of some pollutants.
- The overall (net) effect
- UV radiation is absorbed in the stratosphere and heat energy is released into the stratosphere.
- This causes the stratosphere to warm up.
- Nature always finds a balance
- In the past, the rate of formation of ozone was the same as the rate of destruction of ozone.
- This meant that the concentration of ozone remained constant.
- This is called steady state.
- Chloromethane and bromomethane
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