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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.)
    I would think it's something to do with a shift in the electron density around the molecule; if you imagine the electron density as a 'cloud', when the molecule vibrates or the bonds stretch/bend, I'm guessing that the electron density is redistributed around a certain atom more than another, causing the change in the dipole moment?

    I actually have no idea whether that's right, but that's what my reasoning would be haha.
    lol. Haha no issues.
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    stupid question, but in the mark scheme where it says ' IGNORE SF except 1 SF'. What does this mean exactly ?
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    (Original post by _H_V)
    stupid question, but in the mark scheme where it says ' IGNORE SF except 1 SF'. What does this mean exactly ?
    Basically, it means that you can give the answer to any significant figure (I usually do 3) except 1 significant figure. So like, you can round 5465.43 to 5470 (3 s.f.) but you couldn't round it to 5000 (1s.f.).

    That's my understanding of it haha! I always go with 3 s.f., unless the question specifically states otherwise
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    (Original post by Don Pedro K.)
    Basically, it means that you can give the answer to any significant figure (I usually do 3) except 1 significant figure. So like, you can round 5465.43 to 5470 (3 s.f.) but you couldn't round it to 5000 (1s.f.).

    That's my understanding of it haha! I always go with 3 s.f., unless the question specifically states otherwise
    Thanks, yeah thats what I figured, just wanted to make sure
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    I've done all the past papers for unit 4, is there any point of doing IAL papers? each year just seems to be a slightly different version of the UK papers, are they supposed to be harder ?
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    If I did all the papers do you think that would be enough revision along with learning the stuff I get wrong on all the past papers


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    (Original post by _H_V)
    I've done all the past papers for unit 4, is there any point of doing IAL papers? each year just seems to be a slightly different version of the UK papers, are they supposed to be harder ?

    The standard is pretty much the same. You can do them for the sake of practice.
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    Don't really get question c(I)


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    (Original post by Supermanxxxxxx)
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    Don't really get question c(I)


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    Actually, you just have to compare the data that is given to you in the question with the Infrared Spectrum values in the data booklet. If you check the data booklet, you'll see that both of the peaks indicate the presence of an amide.
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    (Original post by sabahshahed294)
    Actually, you just have to compare the data that is given to you in the question with the Infrared Spectrum values in the data booklet. If you check the data booklet, you'll see that both of the peaks indicate the presence of an amide.
    Meant the question above it the 4 marker


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    (Original post by Supermanxxxxxx)
    Meant the question above it the 4 marker


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    Opps. My bad! Let me try and if I get the answer, I'll explain. Which year is this btw?
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    (Original post by sabahshahed294)
    Opps. My bad! Let me try and if I get the answer, I'll explain. Which year is this btw?
    Jan 2013 unit 5


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    Are we meant to know all these reactions


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    (Original post by Supermanxxxxxx)
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    Don't really get question c(I)


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    You should be able to get 2 marks from the ratios alone, then you need to consider which of the remaining groups are in the same environment
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    (Original post by samb1234)
    You should be able to get 2 marks from the ratios alone, then you need to consider which of the remaining groups are in the same environment
    Was trying it out. But, how many are in the same environment? 5 or 6?
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    (Original post by sabahshahed294)
    Was trying it out. But, how many are in the same environment? 5 or 6?
    tells you the ratios in the question
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    (Original post by sabahshahed294)
    Was trying it out. But, how many are in the same environment? 5 or 6?
    It's 6 says it in the question


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    (Original post by sabahshahed294)
    Was trying it out. But, how many are in the same environment? 5 or 6?
    There is a hint given in the question. "label from a-f"
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    (Original post by Ayman!)
    There is a hint given in the question. "label from a-f"
    not to mention the '6 hydrogen environments' right before'
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    (Original post by Supermanxxxxxx)
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    Are we meant to know all these reactions


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    Anyone know if we're meant to know all This


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