AQA A2 CHEM4 & CHEM5 June 2015 [official discussion thread]

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i'd say the most important thing for carbonyl is you're synthetic routes and tests. All the other conceptual understanding like why are primary and secondary amines stronger bases than ammonia are not too difficult

Okay thanks, going to try and go topic by topic and see how far I get, this is what I get for neglecting chemistry!

Reply 1581

Ilovemaths96

Original post by Shruti12

Aldehyde is oxidised to a carboxylic acid.

but you could also use acidified potassium dichromate and heat it under reflux to go from aldehyde to carboxylic acid right?

Reply 1582

Ilovemaths96

Original post by baffledchick

Okay thanks, going to try and go topic by topic and see how far I get, this is what I get for neglecting chemistry!

same neglected it for far too long. Hopefully aqa wont be too harsh tomorrow, in fact for the rest of the exam session

Reply 1583

baffledchick

Original post by Ilovemaths96

same neglected it for far too long. Hopefully aqa wont be too harsh tomorrow, in fact for the rest of the exam session

I wish I had done some revision last night... my bed was too comfy and I fell asleep :frown:

yeah hopefully! Definitely for chem 5 ahh, which I find easier than this but still, let's just pray there are loads of simple mechanism questions with no cyclic stuff,

Reply 1584

randlemcmurphy

I hope the paper follows the predictable pattern that it normally does. Hope a big chunk is on pH calculations.

Reply 1585

Ilovemaths96

Original post by baffledchick

I wish I had done some revision last night... my bed was too comfy and I fell asleep :frown:

yeah hopefully! Definitely for chem 5 ahh, which I find easier than this but still, let's just pray there are loads of simple mechanism questions with no cyclic stuff,

haha I prefer chem 5, actually interests me as opposed to the organic stuff. If there are cyclic compounds that would be terrible.

Reply 1586

randlemcmurphy

Original post by Ilovemaths96

haha I prefer chem 5, actually interests me as opposed to the organic stuff. If there are cyclic compounds that would be terrible.

I used to be like that, but now I have taken a liking to organic chemistry. CHEM5 bores me because it is all about remembering colours etc. Although redox equilibria is very enjoyable for me.

Reply 1587

Ilovemaths96

Original post by randlemcmurphy

I used to be like that, but now I have taken a liking to organic chemistry. CHEM5 bores me because it is all about remembering colours etc. Although redox equilibria is very enjoyable for me.

redox is fun, always liked half equations. True but for some of the ions whatever you add they remain the same. And i guess its less understanding more learning and memorising

Reply 1588

Ilovemaths96

just to confirm

aryl amines are weaker bases than ammonia as the aryl groups withdraw electrons from N aton as lone pair overlaps with delocalised system making lone pair less available to incoming protons

Reply 1589

Ilovemaths96

would it be a good idea to start from question 5 onwards, then do the easier questions (q1-4) afterwards?

Reply 1590

randlemcmurphy

Original post by Ilovemaths96

would it be a good idea to start from question 5 onwards, then do the easier questions (q1-4) afterwards?

I'd go in order, I used to do this and ending up wasting time flicking back through the pages.

Reply 1591

username1920701

Anyone gimme some help with question 1c in the jan 12 paper chem4, that **** aint in the book right?

Reply 1592

shiney101

Do we need to know how exactly nmr works? Like with nuclear spin etc?

Reply 1593

Ilovemaths96

Original post by randlemcmurphy

I'd go in order, I used to do this and ending up wasting time flicking back through the pages.

yeah good point

Reply 1594

sleepisheaven

How do u revise when you've done all the papers

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Reply 1595

Ozy96

Original post by randlemcmurphy

I hope the paper follows the predictable pattern that it normally does. Hope a big chunk is on pH calculations.

I sure hope so, they've done it even in the old spec... How are you feeling about it? and are what's your revision plan for tonight?

Reply 1596

Thebest786

You know when you write the equation, showing the radical and + molecule formed, is structural formula OK? Or do I always need displayed, even for the radical???

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Reply 1597

randlemcmurphy

Original post by shiney101

Do we need to know how exactly nmr works? Like with nuclear spin etc?

I looked through the spec, they say the structure determination section is more on problem solving.

Reply 1598

Ozy96

Original post by Thebest786

You know when you write the equation, showing the radical and + molecule formed, is structural formula OK? Or do I always need displayed, even for the radical???

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Structural is fine, unless they tell you otherwise. Some questions ask to give the displayed formula of the free radical produced specifically so watch out for the wording in the question