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Kish
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Please can someone help. Im stuck on these questions

C H
8 18 does anyone know what this is. e'g is it decane or ethene(i know it's none of these just helping you to see what i am after). Is it Octane ??

and

why is it possible to polymerise ethene molecules but not ethane molecules.
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GH
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#2
(Original post by Kish)
Please can someone help. Im stuck on these questions

C H
8 18 does anyone know what this is. e'g is it decane or ethene(i know it's none of these just helping you to see what i am after). Is it Octane ??

and

why is it possible to polymerise ethene molecules but not ethane molecules.
I think its octane

You can polymerise ethene molecules because they have double c-c bonds. ie they are unsaturated, whereas the ethane is saturated.

Next time use the academic subforum
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Xenon
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#3
(Original post by Kish)
Please can someone help. Im stuck on these questions

C H
8 18 does anyone know what this is. e'g is it decane or ethene(i know it's none of these just helping you to see what i am after). Is it Octane ??

and

why is it possible to polymerise ethene molecules but not ethane molecules.
This is octane. Decane is C10, and ethene is C2H4. I think that you can only polymerise molecules when they have a double bond. Ethene contains double bonds and therefore can be polymerised, but ethane contains no double bonds.
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Ben.S.
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(Original post by Xenon)
This is octane. Decane is C10, and ethene is C2H4. I think that you can only polymerise molecules when they have a double bond. Ethene contains double bonds and therefore can be polymerised, but ethane contains no double bonds.
You're right - and wrong. It's octane all right, but molecules don't necessarily need double bonds to undergo polymerisations.

Ben
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jediknight007
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(Original post by Ben.S.)
You're right - and wrong. It's octane all right, but molecules don't necessarily need double bonds to undergo polymerisations.

Ben
Yea, 'condensation polymerisation' just suddenly popped up in my head for some reason......
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GH
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(Original post by jediknight007)
Yea, 'condensation polymerisation' just suddenly popped up in my head for some reason......
Ahh yes, where H bond to OH groups in the glucose monomer.
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Ben.S.
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(Original post by 2776)
Ahh yes, where H bond to OH groups in the glucose monomer.
All of the biological macromolecules (DNA, protein and carbohydrates) are formed from the condensation of monomers.

Ben
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(Original post by Ben.S.)
All of the biological macromolecules (DNA, protein and carbohydrates) are formed from the condensation of monomers.

Ben
Yep indeed, forming glycosidic, peptides, ester bonds etc.
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Xenon
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(Original post by Ben.S.)
You're right - and wrong. It's octane all right, but molecules don't necessarily need double bonds to undergo polymerisations.

Ben
I thought it was something like that, but it's been quite a while since I'd done polymerisation.
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Xenon
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(Original post by 2776)
Ahh yes, where H bond to OH groups in the glucose monomer.
Oh yeah, fun! Totally forgot about condensation polymerisation.
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jediknight007
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Like this?

I dunno, I was bored......lol
Attached files
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GH
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(Original post by jediknight007)
Like this?

I dunno, I was bored......lol
Except it is supposed to be a R group on the middle bit. But yes.
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Ben.S.
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(Original post by 2776)
Except it is supposed to be a R group on the middle bit. But yes.
No - he's condensed two glycine residues.

Ben
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jediknight007
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(Original post by 2776)
Except it is supposed to be a R group on the middle bit. But yes.
I was going to use an R but didn't want to confuse people. They would probably go on the net and look at the periodic tables thinking 'What damn element has the symbol R?!'. Anyhow, I was using glycine as an example instead.
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(Original post by Ben.S.)
No - he's condensed two glycine residues.

Ben
Damn my amino acid groups is a bit rusty. What do you do in uni?
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Ben.S.
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(Original post by 2776)
Damn my amino acid groups is a bit rusty. What do you do in uni?
BioNatSci.

Ben
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#17
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#17
(Original post by Ben.S.)
BioNatSci.

Ben
Let me guess, first year Oxford?
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Ben.S.
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(Original post by 2776)
Let me guess, first year Oxford?
So close - Cambridge.

Ben
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(Original post by Ben.S.)
So close - Cambridge.

Ben
One small question. Is it true that Cam, is generally bigger than Ox. By about 2-3 times in some areas. Yet Ox still recives about 12,000 applications, similar amounts as cam.

So is it easier to get to cam then?
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Ben.S.
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(Original post by 2776)
One small question. Is it true that Cam, is generally bigger than Ox. By about 2-3 times in some areas. Yet Ox still recives about 12,000 applications, similar amounts as cam.

So is it easier to get to cam then?
I don't really know about the size - you'd have to add up the intake for all the Oxford sciencey courses. In the Natural Science Tripos here there are about 600 first years. I doubt it's easier to get into Cambridge (at least for science, since it is traditionally supreme - so there!).

Ben
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