these videos are helping so much with my AS Level! i went from a low C to an A on a polymer revolution end of unit test just from your videos, and are helping with my revision for my AS exams this may! Thank you!!:)
Despite the uncertain and anxiety created by exams being cancelled, you have given me great motivation and support through this channel.I cannot thank you enough sir, your time into these videos are honestly the best!
Hi Sir, just two quick queries:1) is the O atom not called a radical because it has two unpaired electrons instead of one?2) does the CFCl2• not catalyse the breakdown of ozone?
This is what the OCR A spec says Learners should be able to demonstrate and apply their knowledge and understanding of: production of halogen radicals by the action of ultraviolet (UV) radiation on CFCs in the upper atmosphere and the resulting catalysed breakdown of the Earth’s protective ozone layer, including equations to represent: (i) the production of halogen radicals (ii) the catalysed breakdown of ozone by Cl• and other radicals e.g. •NO.
TheFrazerboy Hi, technically they are because an oxygen atom has two unpaired electrons in separate orbitals in its outer shell. Radicals are defined as any species with one or more unpaired electrons. Don't worry as this is way beyond the syllabus. I'm sure if you simply draw an O you'd be fine. Hope this helps
can we clone you into 1 million chemistry teachers !
these videos are helping so much with my AS Level! i went from a low C to an A on a polymer revolution end of unit test just from your videos, and are helping with my revision for my AS exams this may! Thank you!!:)
Joe Milner Wow - well done Joe. Thanks for taking the time to comment. Keep watching!
Despite the uncertain and anxiety created by exams being cancelled, you have given me great motivation and support through this channel.I cannot thank you enough sir, your time into these videos are honestly the best!
Is that a Heisenberg costume on the right?
Of course
Amazing!
So helpful!:)
Hi Sir, just two quick queries:1) is the O atom not called a radical because it has two unpaired electrons instead of one?2) does the CFCl2• not catalyse the breakdown of ozone?
my exam spec is OCR A. Is this under the haloalkanes topic? does it cover CFS and the ozone layer?
This is what the OCR A spec says
Learners should be able to demonstrate and
apply their knowledge and understanding of:
production of halogen radicals by the action of ultraviolet (UV) radiation on CFCs in the upper atmosphere and the resulting catalysed breakdown of the Earth’s protective ozone layer,
including equations to represent:
(i) the production of halogen radicals
(ii) the catalysed breakdown of ozone by Cl• and other radicals e.g. •NO.
CCl3F also do the same?
Oxygen is also absorbing UV?
Sir do u have any ozone layer questions
at 3:56 2 oxygen's are formed are these radicals
TheFrazerboy Hi, technically they are because an oxygen atom has two unpaired electrons in separate orbitals in its outer shell. Radicals are defined as any species with one or more unpaired electrons. Don't worry as this is way beyond the syllabus. I'm sure if you simply draw an O you'd be fine. Hope this helps
MaChemGuy If I wrote O radical would I lose any marks seen as though you mentioned it was correct?
OhHaiBrah You actually don't need to put radical signs at all in F322
Rameen S I'd rather be correct chemistry wise
OhHaiBrah I know, I put the radicals anyway, but since you're not marked on radicals, I don't think you would lose any marks for having a radical.
So why we need ozone?
The Ozone reduces the amount of UVb reaching the earth by 95%