Name some compounds which have depleted the ozone layer ...
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Originally Answered: What are the chemical reactions through which ozone depleting substances deplete upper atmospheric ozone?
I can’t figure out how to do subscripts at the moment so bear with me. Also it’s been a while since I’ve had chemistry, so I’ve forgotten my terminology and that makes this a bit informal.
One chemical is Trichlorofluoromethane , there are other chlorine sources, but this is simpler.
CFCl3
That CFCl3 gets hit with UV light and a chlorine atom gets knocked off.
CFCl3 + UV Light ⟶ CFCl2 + Cl
Chlorine atoms do not like to be alone like that, they want 8 valence electrons, have 7 and are looking to get something that has one electron in its outer ring. However they will instead run intoozone O3.
Ozone isn’t the most stable of chemicals, the 3rd oxygen atom is an easy steal.
2. Cl + O3 ⟶ ClO + O2
Chlorine would rather have something from the first column of the periodic table, something with one valence electron, so its hold isn’t as strong to that oxygen. In the atmosphere you will have oxygen ions, and oxygen atoms love other oxygen atoms more than chlorine loves oxygen so this happens.
3. ClO + O ⟶Cl + O2
Well dang, that chlorine is alone again! He’s going to go steal another oxygen atom from ozone again. Back to step 2.
And that’s the problem. Chlorine is a catalyst, going out to tear apart ozone and doesn’t stop until it runs into something else.
But chlorine does make its way out, if it runs into something like methane.
4. Cl+CH4⟶HCl+CH3
There are more ways it can stop getting freed as well, this is just a simpler example.
HCl might interact with water and then eventually drop down in rain..
It’s thousands of times less likely for Cl to run into CH4 than it is to run into ozone. Ozone is much more common. It is said that one Cl can destroy 100,000 ozone molecules but that is calculated via relative concentrations of gases in the atmosphere.
The good thing though, ozone is produced constantly.
5. O2 + UV Light ⟶ 2O
6. O2 + O ⟶ O3
The only issue though is it doesn’t get produced fast enough when it’s cold and dark, like the south pole in winter. The south pole also has an interesting weather pattern, a vortex that doesn’t let the ozone diffuse in easily. So no ozone being produced, none filtering in leads to a “hole” (it’s more of an area of different composition than an opening). Summer comes by and then the “hole” starts to heal.
We’ve banned a lot of the problem chemicals, so the periodic hole tends to be smaller than it used to be and heals faster. It reached its peak in 2000.
There’s also events in spring time at both poles that ozone gets depleted, I’m not as well versed in the chemistry of those as I was in a different field of work when I learned about it. It involves bromine.
Hope this is useful.
please mark as brainliest
Originally Answered: What are the chemical reactions through which ozone depleting substances deplete upper atmospheric ozone?
I can’t figure out how to do subscripts at the moment so bear with me. Also it’s been a while since I’ve had chemistry, so I’ve forgotten my terminology and that makes this a bit informal.
One chemical is Trichlorofluoromethane , there are other chlorine sources, but this is simpler.
CFCl3
That CFCl3 gets hit with UV light and a chlorine atom gets knocked off.
CFCl3 + UV Light ⟶ CFCl2 + Cl
Chlorine atoms do not like to be alone like that, they want 8 valence electrons, have 7 and are looking to get something that has one electron in its outer ring. However they will instead run intoozone O3.
Ozone isn’t the most stable of chemicals, the 3rd oxygen atom is an easy steal.
2. Cl + O3 ⟶ ClO + O2
Chlorine would rather have something from the first column of the periodic table, something with one valence electron, so its hold isn’t as strong to that oxygen. In the atmosphere you will have oxygen ions, and oxygen atoms love other oxygen atoms more than chlorine loves oxygen so this happens.
3. ClO + O ⟶Cl + O2
Well dang, that chlorine is alone again! He’s going to go steal another oxygen atom from ozone again. Back to step 2.
And that’s the problem. Chlorine is a catalyst, going out to tear apart ozone and doesn’t stop until it runs into something else.
But chlorine does make its way out, if it runs into something like methane.
4. Cl+CH4⟶HCl+CH3
There are more ways it can stop getting freed as well, this is just a simpler example.
HCl might interact with water and then eventually drop down in rain..
It’s thousands of times less likely for Cl to run into CH4 than it is to run into ozone. Ozone is much more common. It is said that one Cl can destroy 100,000 ozone molecules but that is calculated via relative concentrations of gases in the atmosphere.
The good thing though, ozone is produced constantly.
5. O2 + UV Light ⟶ 2O
6. O2 + O ⟶ O3
The only issue though is it doesn’t get produced fast enough when it’s cold and dark, like the south pole in winter. The south pole also has an interesting weather pattern, a vortex that doesn’t let the ozone diffuse in easily. So no ozone being produced, none filtering in leads to a “hole” (it’s more of an area of different composition than an opening). Summer comes by and then the “hole” starts to heal.
We’ve banned a lot of the problem chemicals, so the periodic hole tends to be smaller than it used to be and heals faster. It reached its peak in 2000.
There’s also events in spring time at both poles that ozone gets depleted, I’m not as well versed in the chemistry of those as I was in a different field of work when I learned about it. It involves bromine.
Hope this is useful.
please mark as brainliest
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