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1.CFCs and substitutes and the ozone hole.
The environmental effects of CFCs and their substitutes
a.CFCs - highly stable molecules, lifetime in the atmosphere of between 50 and 100 years; contain 2 or 3 chlorine atoms.
b.CFCs substitutes ( transitional compounds)
i.HCFCs - one or more of the chlorine atoms has been replaced by hydrogen atoms, lifetime in the atmosphere about 20 years, have a tenth or twentieth of the potential damage of the CFCs.
ii.HFCs - all the chlorine is replaced by hydrogen - not damaging to ozone - lifetime in the atmosphere about 20 years.
- Environmental Effects
- The Effects of Tetracycline on Chick Embryos
- Why Have People Migrated to Australia and what Have Been the Effects of Immigration on the Country and Its People?
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