Wasn't the question something like what are the conditions to oxidise an alcohol, and how could he make sure that only the aldehyde was produced or something? Or what was it?(Original post by ElChapo)
Heat under reflux and distil is a con, you cant do both, you just had to say distil.
Marks:
Acidified (1)
Dichromate (1)
Distil (1)
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F334 (19/06/2013 9:00AM) - Salters Chemistry (Chemistry of Materials) Revision Thread watch
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- 19-06-2013 17:47
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- 19-06-2013 18:10
(Original post by EdwinLo)
Wasn't the question something like what are the conditions to oxidise an alcohol, and how could he make sure that only the aldehyde was produced or something? Or what was it? -
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- 19-06-2013 18:22
(Original post by ElChapo)
Yeah it wanted the reagent(s) and conditions to make sure you formed an aldehyde, and thats to distil it, refluxing would give you a carboxylic acid -
Mattywooda
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- 19-06-2013 18:24
(Original post by Pandora's Box)
Does this mean that it was neutral? -
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- 19-06-2013 19:04
(Original post by EdwinLo)
Damn that sucks I always thought you could "reflux and distil off the product" and my teachers never corrected me...So do you think that would lose 1 mark then? Would I get the other 2 for acidified potassium dichromate? -
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- 19-06-2013 19:08
Is there an unofficial mark scheme?
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- 19-06-2013 19:20
What did people put for that rate question with the graph?
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- 19-06-2013 19:40
(Original post by ElChapo)
Yes you should do, only 1 mark though -
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- 19-06-2013 20:03
(Original post by Mattywooda)
Google is your friend. Quick search shows tyrosine neutral and polar (http://www.elmhurst.edu/~chm/vchembo...structure.html).
(Original post by EdwinLo)
Damn that sucks I always thought you could "reflux and distil off the product" and my teachers never corrected me...So do you think that would lose 1 mark then? Would I get the other 2 for acidified potassium dichromate? -
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- 19-06-2013 20:42
(Original post by Richyp22)
I love, so it was definatly neutral?
Did you do that past papers? As these exact conditions have come up on several past papers. -
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- 19-06-2013 21:59
(Original post by EdwinLo)
Only 1 mark lost or only 1 mark gained? -
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- 19-06-2013 22:13
I'm pretty sure tyrosine should be acidic, because the twitterion is neutral, and there is a phenol group as well?
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- 19-06-2013 22:50
(Original post by super121)
What did people put for that rate question with the graph?
(Original post by CureSam)
I'm pretty sure tyrosine should be acidic, because the twitterion is neutral, and there is a phenol group as well? -
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- 19-06-2013 23:15
for me, this exam was better than f335!
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- 19-06-2013 23:20
(Original post by CureSam)
I'm pretty sure tyrosine should be acidic, because the twitterion is neutral, and there is a phenol group as well?
http://www.elmhurst.edu/~chm/vchembo...structure.html -
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- 19-06-2013 23:32
(Original post by Richyp22)
Regardless of what you think it's neutral. Unless your saying this source is wrong?
http://www.elmhurst.edu/~chm/vchembo...structure.html -
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- 19-06-2013 23:41
(Original post by :)ella)
Yeah that source says it's neutral in water, but in the exam it was in NaOH -
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- 20-06-2013 07:59
(Original post by Richyp22)
Naoh wasn't mentioned in that specific question im afraid, it said only aqueous solution(in water). -
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- 20-06-2013 08:27
(Original post by Richyp22)
Regardless of what you think it's neutral. Unless your saying this source is wrong?
http://www.elmhurst.edu/~chm/vchembo...structure.html -
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- 20-06-2013 10:56
(Original post by EstebanK0)
I put down neutral, but I don't know if my reasoning was correct. Could you explain what would you write?
To be honest I wouldn't be surprised if they actually allowed
-neutral and justification
or
-acidic and justification
I was torn which one to write and went for neutral in the end but it seemed pretty tricky.
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