OCR B Salter's Chemistry by Design F335 - 15th June 2015 Watch

Solarburst
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#281
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#281
(Original post by ASDuh97)
Did anyone say methanol for the reagent of that amide group turning into a methyl group and ammonia being given out?
Yeah methanol
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exams567
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#282
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#282
which structure of the monosubsitited phenol did you draw for the nmr? Just any phenol with a cl?
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exams567
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#283
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#283
(Original post by tealover96)
Ahh crap I completely forgot to label it! That was one mark, I'm hoping?
For the drawing I did alcohol on top and cl on the bottom of the benzene ring? Because I thought that was the only isomer with three H environments
I did that but cl on top and OH at the bottom- shouldn't matter?
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Minecraft27
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#284
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#284
This paper was much better and much more accessible than that rotten first paper.

Anyone else get pH of 3.26 and 7.08?

There were 5 isomers of chlorophenol right? Also, the NMR one had the chlorine on the bottom carbon, I got.
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Solarburst
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#285
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(Original post by Minecraft27)
This paper was much better and much more accessible than that rotten first paper.

Anyone else get pH of 3.26 and 7.08?

There were 5 isomers of chlorophenol right? Also, the NMR one had the chlorine on the bottom carbon, I got.
Yes.

Don't know

No, 3 isomers
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Minecraft27
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#286
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#286
(Original post by Solarburst)
Yes.

Don't know

No, 3 isomers
Why only 3? There were 5 remaining carbons.
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Shantellea
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#287
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#287
(Original post by Priya265)
I got 12.0 but I dont know if thats right
I got 12.0 as well but tbh I don't know how


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radhikagulati
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#288
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#288
What are people thinking for grade boundaries? Maybe around 85 for an A?
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exams567
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#289
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Louis2896
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#290
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(Original post by Priya265)
I got 12.0 but I dont know if thats right
I got 12.0 too.
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tealover96
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#291
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(Original post by exams567)
I did that but cl on top and OH at the bottom- shouldn't matter?
Yep it doesn't make a difference
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BrokenS0ulz
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#292
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(Original post by tealover96)
Ahh crap I completely forgot to label it! That was one mark, I'm hoping?
For the drawing I did alcohol on top and cl on the bottom of the benzene ring? Because I thought that was the only isomer with three H environments
I think it was 2 marks but not completely sure. I drew a phenols with a Cl atom2 carbons away
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Solarburst
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#293
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(Original post by Minecraft27)
Why only 3? There were 5 remaining carbons.
Think about it if you draw it on the '5th' carbon that's effectively the 1st carbon.

Draw it out and you'll see, always count the lowest number
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The_Danimal
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#294
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#294
Did anyone else get 12.0 for the pH question? It took soo long to do for 3 marks!
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Welbeck
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#295
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#295
i got ph=10
The question was 25cm3 of acid reacted with 30cm3 of naoh with both being 0.02moldm-3
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king cobra
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#296
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(Original post by BrokenS0ulz)
I think it was 2 marks but not completely sure. I drew a phenols with a Cl atom2 carbons away
What did we have to label ?


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MasterOfTheSwag
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#297
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(Original post by Minecraft27)
Why only 3? There were 5 remaining carbons.
Because the others were reflections.
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Solarburst
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#298
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(Original post by Minecraft27)
Why only 3? There were 5 remaining carbons.
That was so poorly worded aha,

Just draw them out and count from the phenol with the lowest number
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username1082804
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#299
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#299
Some answers I can remember:
-pH: 3.3 (I think), 13 or 12
-33% for % by mass
-100% atom economy - no waste, environmentally friendly
-similarities: both form alkybenzene
-differences: Friedel-Crafts reactions normally used acyl chloride or halogenoalkane, but this was an alkene group
-Kekule structure favours electrophilic addition reactions. The other one shows that benzene undergoes electrophilic substitution reactions preserving the ring, so it is more stable.
-Increasing pressure would increase both the rate and equilibrium yield
-Increasing temperature would decrease the equilibrium constant
-methanol for one of the reagent
aldehyde, conc. Sulfuric acid, acidified potassium dichromate
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BrokenS0ulz
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#300
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(Original post by king cobra)
What did we have to label ?


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The structure for which protons were responsible for Each peak in the nmr
(Original post by The_Danimal)
Did anyone else get 12.0 for the pH question? It took soo long to do for 3 marks!
I got 12
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