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

ssaahhaanndd
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#101
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#101
you're a life saver! thank you so much.
my college is *****y about giving out past papers before exam boards puts them up.
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Shostakovish
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#102
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#102
So I'm going to lower the grade boundary...
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Shantellea
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#103
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#103
(Original post by Shostakovish)
So I'm going to lower the grade boundary...

Have you done past papers?
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tealover96
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#104
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Please can someone help me with the June 2014 n.m.r
I don't understand the last points in the mark scheme

4. two CH3 groups on one C / two CH3 in same environment
5. CH attached to O/ CH-O/ O-CH (5.0)OR CH next to carbon(s) with many/six H (5.0)
6. CH3 attached to C=O (2.0) OR CHC=O OR CH3 next to carbonwith no H

How on earth do you get that from the spectra
I feel like I can't even read the chemical shifts ont the data sheet properly
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BrokenS0ulz
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Does anybody know if you can use pencil for drawing full structural formula? It's sort of a diagram isn't it?
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Shantellea
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(Original post by BrokenS0ulz)
Does anybody know if you can use pencil for drawing full structural formula? It's sort of a diagram isn't it?
I'm not sure but i wouldn't risk it, if you do it in pencil just go over it in pen
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Shantellea
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(Original post by tealover96)
Please can someone help me with the June 2014 n.m.r
I don't understand the last points in the mark scheme

4. two CH3 groups on one C / two CH3 in same environment
5. CH attached to O/ CH-O/ O-CH (5.0)OR CH next to carbon(s) with many/six H (5.0)
6. CH3 attached to C=O (2.0) OR CHC=O OR CH3 next to carbonwith no H

How on earth do you get that from the spectra
I feel like I can't even read the chemical shifts ont the data sheet properly
I get the proton equivalence because there are only 3 peaks but 5 carbons, then i used the data sheet to see what type of environment it was but i have no idea on how to do the rest try and go over it with a teacher tomorrow?
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hannnahcox
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(Original post by BrokenS0ulz)
Does anybody know if you can use pencil for drawing full structural formula? It's sort of a diagram isn't it?
Pretty sure I did last year and it was fine

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tealover96
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(Original post by Shantellea)
I get the proton equivalence because there are only 3 peaks but 5 carbons, then i used the data sheet to see what type of environment it was but i have no idea on how to do the rest try and go over it with a teacher tomorrow?
Okayy thanks anyway!
It's just that n.m.r doesn't feel logical
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imedico10
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#110
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How do we convert 41 marks out of 45 in chemistry coursework to ums?
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Shantellea
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(Original post by imedico10)
How do we convert 41 marks out of 45 in chemistry coursework to ums?
Double it as the total UMS for the coursework is 90
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BrokenS0ulz
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Does anyone get part 2?
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Shantellea
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(Original post by BrokenS0ulz)
Does anyone get part 2?
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pKa is equal to pH so just -log of the Ka i think
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BrokenS0ulz
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(Original post by Shantellea)
pKa is equal to pH so just -log of the Ka i think
the answer is 2.73 and the pKa thing gives 3.03
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lastminutelarry6
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does anyone have the june 2014 f335 paper please??
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Shantellea
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#116
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#116
(Original post by BrokenS0ulz)
the answer is 2.73 and the pKa thing gives 3.03
Okay I just got it, write out the ka formula for a buffer then sub in the numbers
[H+]= 9.3x10-4 x 0.1/0.05
Then -log of that answer 😀


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Shantellea
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(Original post by lastminutelarry6)
does anyone have the june 2014 f335 paper please??
I posted the link to it on the previous page of this thread


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MrPolish
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#118
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im so stressed out about this exam >.< im resitting aswell, last year i got an E >.<
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username1254695
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#119
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holy crap, i've never felt so under pressure, i have geography on the same day and then another exam the day after, if f335 is anything as bad as f334 there is literally no hope for me...
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Diamond Crafter
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(Original post by thelizzister)
holy crap, i've never felt so under pressure, i have geography on the same day and then another exam the day after, if f335 is anything as bad as f334 there is literally no hope for me...
The best thing to do is to take each exam one at a time and forget about the others until you've finished the one you're doing. And we'll all be fine as long as we go in guns blazing (not literally for obvious reasons) and try our hardest.

N.B. I sound WAY more positive than I actually am.
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