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OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

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Reply 1100

bakedbeans247

Original post by tcameron

last years was the worst
But i think june 2010 was pretty hard as

Ah ok, ill check it out to see if i've done it! Yeah i'm resitting from that paper :tongue:

But i went through it today, it's not that bad you know!

Reply 1101

itsConnor_

Original post by AqsaMx

Guys how would you draw the optical isomer if there's two chiral centres?

E.g CH3CH(OH)CH(NH2)CH3

Can anyone show me how the optical isomers would look?

Oh never mind, I forgot 2 chiral centres results in 4 optical isomers :colondollar:

is this two of the 4? https://gyazo.com/7827531e86b2535c247acc6342d4b92d

Reply 1102

aydin124

guys do you any other specification that does proton nmr and what paper is it?

Reply 1103

tcameron

Original post by aydin124

guys do you any other specification that does proton nmr and what paper is it?

aqa - all their papers

Reply 1104

DrAdrenaline

Does anyone have the chemistry 2015 papers that you could kindly link please?
Thanks.

Reply 1105

AqsaMx

Is this compound called methylbenzyl benzoate?

Reply 1106

ReTakingF324/5

Original post by bakedbeans247

Evidently it was super tough for me too! Back here again resitting...but i just went over it and it's seemed okay! And my favorite topics came up too. Not sure how i went wrong last yr...gl!

Me too bro :biggrin:

. You fasting? It's hard to study and fast lol I'd assume your Muslim from your pic lol.
Either way this paper I think will be okay. Last year I got a U, redid the paper eariler and I got an A. Still though, exam pressure will make it so much harder to remember basic stuff!

I think I'm gonna get at worst C at best A.

Reply 1107

tcameron

Original post by AqsaMx

These 4?

IMAG0492[1].jpg179.6KB

Reply 1108

ReTakingF324/5

Original post by AqsaMx

Is this compound called methylbenzyl benzoate?

I'd say so.

Reply 1109

M.Branson98

When you have a salt of an amine e.g ethylammonium chloride, where do you put the positive charge? Is it on the N or what?

Reply 1110

Cal 1

Original post by M.Branson98

When you have a salt of an amine e.g ethylammonium chloride, where do you put the positive charge? Is it on the N or what?

Should be the N as this is what's accepted the proton (H^+)

Reply 1111

M.Branson98

Original post by AqsaMx

Is this compound called methylbenzyl benzoate?

According to wikipedia, it would be called benzyl benzoate.

Reply 1112

ranz

i guess what messed me up was realising what peak was due to HC-C-N ImageUploadedByStudent Room1465832224.243026.jpg

how did u guys know it was the singlet?

Posted from TSR Mobile

Reply 1113

lai812matthew

Original post by bakedbeans247

any F324 predictions for tomorrow guys? teachers say anything?

teacher said there is gonna be an nmr for amides or halogenoalkanes.

Reply 1114

lai812matthew

Original post by ranz

i guess what messed me up was realising what peak was due to HC-C-N ImageUploadedByStudent Room1465832224.243026.jpg

how did u guys know it was the singlet?

Posted from TSR Mobile

no neighbouring protons. one of the R1/ R2 is just a CH3. it is attached to another C and double bond with N. so no H beside.

Reply 1115

lai812matthew

Original post by M.Branson98

When you have a salt of an amine e.g ethylammonium chloride, where do you put the positive charge? Is it on the N or what?

preferably N but they don't penalise on that

Reply 1116

bakedbeans247

Original post by lai812matthew

teacher said there is gonna be an nmr for amides or halogenoalkanes.

Oh really? Cool. Bit random, how'd she guess that it would be about those molecules exactly? lol Thanks though!

Reply 1117

lai812matthew

Original post by bakedbeans247

Oh really? Cool. Bit random, how'd she guess that it would be about those molecules exactly? lol Thanks though!

cuz it never came up in any papers before, and the exam board will try to catch people out with things that are never examined before. another thing i thought is how to distinguish a compound with stereoisomers and a compound without it. the answer is plane polarised light. and the racemic mixture thingy. it appears at AQA every year but never in OCR even though it is in the textbook!

Reply 1118

itsConnor_

Original post by lai812matthew

teacher said there is gonna be an nmr for amides or halogenoalkanes.

how do you predict that? .....

Reply 1119

itsConnor_

Original post by bakedbeans247

any F324 predictions for tomorrow guys? teachers say anything?

I'm thinking triglycerides/fatty acids in some form. Hasn't come up in 3 years

trans fats increase low density lipoproteins/'bad cholesterol' and lead to coronary heart disease / strokes