lhh2003
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I get why HFCs are safer as the F-C bond is stronger than the Cl-C bond. But is HCFCs, Cl-C bonds are present which are also in CFCs and the breakdown of these bonds to form Cl radicals is what deplete O3.
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SudiT
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(Original post by lhh2003)
I get why HFCs are safer as the F-C bond is stronger than the Cl-C bond. But is HCFCs, Cl-C bonds are present which are also in CFCs and the breakdown of these bonds to form Cl radicals is what deplete O3.
I think it is due to the presence of the C-H bonds in HCFCs which are susceptible to the attack of free radicals and cause the molecule to decompose much quicker than CFCs.
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lhh2003
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(Original post by SudiT)
I think it is due to the presence of the C-H bonds in HCFCs which are susceptible to the attack of free radicals and cause the molecule to decompose much quicker than CFCs.
When you say 'decompose quicker', what do you mean ? Surely if free radical substitution is happening, the Cl atoms are still gonna be up there, but just continuously reacting and being decomposed ?
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SudiT
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(Original post by lhh2003)
When you say 'decompose quicker', what do you mean ? Surely if free radical substitution is happening, the Cl atoms are still gonna be up there, but just continuously reacting and being decomposed ?
The HCFCs will be broken down before they can reach higher parts of the atmosphere such as the stratosphere where the chlorine would contribute to ozone depletion. So they're still not completely safe but are less impactful on the environment than CFCs.
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