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Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread Watch

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    (Original post by Don Pedro K.)
    Ah okay haha I definitely found it harder than any of the past papers lol... Oh well hopefully unit 5 will be nicer? XD
    Oh I agree it was definitely a much harder paper than normal. We'll see what they have in store for unit 5 next week
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    (Original post by samb1234)
    Oh I agree it was definitely a much harder paper than normal. We'll see what they have in store for unit 5 next week
    Hopefully not as carcinogenic as benzene
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    (Original post by C0balt)
    Hopefully not as carcinogenic as benzene
    Indeed hopefully they've been using some toluene to make it nice for us
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    (Original post by samb1234)
    Indeed hopefully they've been using some toluene to make it nice for us
    Yeah toluene paper would be easier for us to attack
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    (Original post by samb1234)
    Indeed hopefully they've been using some toluene to make it nice for us
    (Original post by C0balt)
    Yeah toluene paper would be easier for us to attack
    This is awesome keep going pls hahahaha
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    (Original post by C0balt)
    Yeah toluene paper would be easier for us to attack
    are we allowed to use trinitrotoluene for the attack or is that cheating?
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    but on a serious note though, if asked why toluene is more reactive than benzene, how do we phrase that the methyl group increases the ring's electron density? Saying it "donates" electrons sounds kinda dodgy...
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    (Original post by samb1234)
    are we allowed to use trinitrotoluene for the attack or is that cheating?
    As long as we wear gloves lab coat and goggles the risk and hazard should be lowered enough. Oh make sure you carry out the attack in the fume cupboard too.
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    (Original post by samb1234)
    Yeah it wasn't too bad, hopefully won't have lost too many marks. I have pretty extensive notes for chem 5 already so probably just doing papers for it tbh and reading over my notes (although I need to prioritise some other subjects a bit more atm) so that I should be ready to go by the exam. How did yours go?
    There was a dibasic titration curve on ours along with sketching an NMR and designing a rate experiment involving the Arrhenius equation worth a tonne of marks. I have the general ideas on all of those correct but since they haven't be tested before, I have no idea how much I'll lose on each. I might lose 1-2 on the titration curve because my volume axis stuff probably wasn't very accurate and 1 on the NMR because of the height of my peaks. Losing a couple of marks here and there, I'm predicting myself a 75 (might be a little generous ). Wasn't too bad in my opinion, but definitely a little challenging - I enjoyed it though haha

    I'll be bothering you with a few U5 questions later on if you don't mind. I'm currently doing the 2013 paper.
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    (Original post by Ayman!)
    There was a dibasic titration curve on ours along with sketching an NMR and designing a rate experiment involving the Arrhenius equation worth a tonne of marks. I have the general ideas on all of those correct but since they haven't be tested before, I have no idea how much I'll lose on each. I might lose 1-2 on the titration curve because my volume axis stuff probably wasn't very accurate and 1 on the NMR because of the height of my peaks. Losing a couple of marks here and there, I'm predicting myself a 75 (might be a little generous ). Wasn't too bad in my opinion, but definitely a little challenging - I enjoyed it though haha

    I'll be bothering you with a few U5 questions later on if you don't mind. I'm currently doing the 2013 paper.
    I'll probably have to look them up in my notes to refresh lol but sure ask ahead. Sounds like your paper will have lowish boundaries as well then
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    (Original post by Hdb)
    Thanks bro, really need to do well in unit 5 since I've only scraped an A* in practical too :/
    Same Dropped a couple UMS i shouldnt have in practical so prob need 86% UMS in unit 5 for an A, i can hope XD
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    Hey, does anyone know where I can get hold of the unit 4 paper we did or an unofficial mark scheme?
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    (Original post by lfcrules)
    Ibthink ln (1/time) is ok in the y axis as 1/time is proprtional to rate.
    Yeh very true
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    (Original post by Hdb)
    How do you know they're raising the grade boundaries? Hope it is 74 for an A* 🙏🏻
    I would assume so considering they have been increasing over the last few years but I'm probably wrong on this. It'll be better to be pessimistic
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    (Original post by C0balt)
    Hopefully not as carcinogenic as benzene
    Sorry to bother, you seem to know a lot, I think I may have missed out saying ln (1/t) and just said 1/t but said everything about gradient etc. and -Ea/R- will I most probably lose most marks?!
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    (Original post by nerdygeek101)
    Sorry to bother, you seem to know a lot, I think I may have missed out saying ln (1/t) and just said 1/t but said everything about gradient etc. and -Ea/R- will I most probably lose most marks?!
    No worries ☺
    Um I think you'll lose a mark for sure for not plotting lnrate against 1/T (or ln1/t against 1/T possibly). I'm not sure what other 5 marks would be for so I can't say for definite
    I'd stop worrying about it now and focus on the incoming unit 5
    Good luck
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    (Original post by Don Pedro K.)
    but on a serious note though, if asked why toluene is more reactive than benzene, how do we phrase that the methyl group increases the ring's electron density? Saying it "donates" electrons sounds kinda dodgy...
    Inductive effect since it's an alkyl chain?
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    Hi! I just wanted to ask about the electrophilic substituition of benzene. I know how to do it but I'm just confused regarding this.

    https://a5c076379da85d2c0b501a60f1a4...0Chemistry.pdf

    In question 15(aii),I got this right while solving but shouldn't we use a catalyst which has Br in it like Iron(III) Bromide since we have to break the C-Br bond here. Why did they use AlCl3 here instead?
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    AlCl3 and FeBr3 are known for being halogen carriers. It shouldnt matter if its with a Cl , Br or I for that matter

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    (Original post by ayvaak)
    AlCl3 and FeBr3 are known for being halogen carriers. It shouldnt matter if its with a Cl , Br or I for that matter

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    Oh. I thought there was some sort of a rule in which it matters that you use specific halogen carriers to break the specific carbon-halogen bonds in order to form a nucleophile. Thanks a lot.
 
 
 
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