OCR Chemistry B (Salters) F334/F335 Exam Thread 2016 (14th/22nd June)

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Well its symmetrical so thats where the opposite sides comes from. The image is from a UCLA pdf on NMR.

not sure symmetry has much to do with whether they can interact or not though. lol ok well not the same molecule but who knows

Reply 781

YeSand

Guys if you have further exams, I highly suggest you not to waste time over this thread. Go and revise.

Majority did bad so the grade boundaries will compensate for it.

Thank me later.

Reply 782

Zuzuvela

Original post by Bruhh

Hmm okay, but I thought if you had a group on the benzene the environments were slightly different like in this image:

By the OCR data sheet that's 2 environments not 6. The attached group wasn't an alkyl group anyways like your picture shows. One environment on the left benzene-nitrogen thing, another on the benzene ring on the right attached to the amide. One one the amide.

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Reply 783

Loyota

Original post by YeSand

Guys if you have further exams, I highly suggest you not to waste time over this thread. Go and revise.

Majority did bad so the grade boundaries will compensate for it.

Thank me later.

But.. It's too fun :wink:

Reply 784

Bruhh

Original post by Zuzuvela

Well I think both are reasonably valid answers so we'll just have to see :smile:

Reply 785

emfs

freezing temp: -7
n = 4
y = 2

anyone else got these?

Reply 786

GetMeToUni99

what was the pressure?

Reply 787

Abbie_1511

Original post by Zuzuvela

6 hydrogen environments is wildly wrong. NMR with more than 4 peaks just doesn't happen at A2.
You may be correct -1.9 was an answer that a majority got. It wasn't clear what was meant by particles dissolved (already dissolved or to be dissolved) whether it was talking about the ions or the solute overall. Some of those answers were suggested btw not necessary what I put.

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Wildly wrong?? lol sure
I got 6 too

Reply 788

Elle_w

Original post by Abbie_1511

Wildly wrong?? lol sure
I got 6 too

So did I

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Reply 789

Zuzuvela

Original post by Abbie_1511

Wildly wrong?? lol sure
I got 6 too

There was 6 hydrogen environments apparently according to my teacher but only 3 different ones if you know what I mean. So you used the numbers 1,2,3 and labeled each environment accordingly. The number 3 was used only once I just got the email from my teacher. He's not willing to publish the paper because he's not meant to have it

Labels 1 and 2 were already done for you you just added a couple of ones and twos and a single 3. Basically if it was a NMR graph it would be 3 peaks total area representing 6 Hs
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(edited 7 years ago)

Reply 790

_MAT_

Original post by Zuzuvela

Thats 4 environments

Reply 791

WittyGonStein

Original post by GetMeToUni99

what was the pressure?

I got 0.036 but Im awful at the maths questions so someone else needs to verify

Reply 792

mathsaddict1234

Has anyone done the chemistry A ocr paper on 27 May and 10 June 2016??

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Reply 793

Bruhh

Original post by WittyGonStein

I got 0.036 but Im awful at the maths questions so someone else needs to verify

I also got 0.036 if I recall correctly.

Reply 794

Zuzuvela

Original post by Bruhh

I also got 0.036 if I recall correctly.

Would you mind telling me how if you remember. I am interested as it may well be something I need to know for uni if I get there. Thanks

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Reply 795

Bruhh

Original post by Zuzuvela

Would you mind telling me how if you remember. I am interested as it may well be something I need to know for uni if I get there. Thanks

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Umm I can't remember the numbers exactly, but 1mol of gas takes up 24dm^3 in 1atm. I think it was asking about what the pressure of 1.5x10-3 moles of gas would be in a 24dm3 volume. So I just did 1.5x10-3 x 24 to get that answer, it'd be helpful if I had the question to refer to as I realise thats an awful explanation.

Reply 796

WittyGonStein

Original post by Zuzuvela

Would you mind telling me how if you remember. I am interested as it may well be something I need to know for uni if I get there. Thanks

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Just looked online and it says pressure and volume are inversely proportional and so I think you work out the volume and then divide 1 by ths value so I think I got it wrong

Reply 797

Zuzuvela

Original post by WittyGonStein

Just looked online and it says pressure and volume are inversely proportional and so I think you work out the volume and then divide 1 by ths value so I think I got it wrong