Chemistry unit 6 June 2016

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    (Original post by Aimen.)
    My teacher says it saves us alot of time and plus they don't give us data booklet in unit 6, they just give us useful pieces in the paper!
    I dont do unit 6 so i apologise, but i can pretty much guarantee you that for that particular question you have to do the calculations rather than just saying its v3+ or whatever because thats what i've learnt
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    Could someone list all the topics from unit 4 and 5 that I should revise for unit 6 .. or is it everything?
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    I have a question,

    For separating the caffeine from the aqueous mixture, is it suppose that when we add the solvent, the solvent would dissolve caffeine and an aqueous layer would form that is the lower layer then we should separate the caffeine from the solvent ?
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    (Original post by PlayerBB)
    I have a question,

    For separating the caffeine from the aqueous mixture, is it suppose that when we add the solvent, the solvent would dissolve caffeine and an aqueous layer would form that is the lower layer then we should separate the caffeine from the solvent ?
    What year?
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    Here they are if you want to checkout the pages that they've linked in the book. Just type in "A2 chemistry revision guide" on Scribd

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    (Original post by Adorable98)
    What year?
    June 2013

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    does anyone have jan 2016 paper?
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    (Original post by aldamon)
    Do they give the data booklet for unit 6 exam? i dont think so
    Well no they don't but they'll provide with required info frm data booklet within question!
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    (Original post by samb1234)
    I dont do unit 6 so i apologise, but i can pretty much guarantee you that for that particular question you have to do the calculations rather than just saying its v3+ or whatever because thats what i've learnt
    Lol yea I totally agree with you but then we could double check our answers if we already have learnt it!
    secondly sometimes a few students have no idea of what to do, so it's better writing answers cuz sometimes you get full marks for sole answers!
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    (Original post by PlayerBB)
    I have a question,

    For separating the caffeine from the aqueous mixture, is it suppose that when we add the solvent, the solvent would dissolve caffeine and an aqueous layer would form that is the lower layer then we should separate the caffeine from the solvent ?
    What you wrote is right but it's not on the mark scheme for some reason & I can't find the examiner report for this paper?!
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    (Original post by baebae)
    does anyone have jan 2016 paper?
    Here is paper, markscheme and examiner report!
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  1. File Type: pdf January 2016 (IAL) QP - Unit 6 Edexcel Chemistry.pdf (469.4 KB, 63 views)
  2. File Type: pdf January 2016 (IAL) MS - Unit 6 Edexcel Chemistry.pdf (167.7 KB, 67 views)
  3. File Type: pdf WCH06_01_pef_20160303.pdf (87.0 KB, 64 views)
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    (Original post by PlayerBB)
    I have a question,

    For separating the caffeine from the aqueous mixture, is it suppose that when we add the solvent, the solvent would dissolve caffeine and an aqueous layer would form that is the lower layer then we should separate the caffeine from the solvent ?
    Well caffeine is in dichloromethane which is the lower layer, and the seperation is in the next step!
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    Hi there. Can someone explain 2a (ii) please? I checked the mark scheme but I don't get the reason behind that why this is the answer?

    https://52e1064b4dc7f9fd87a96faa7f7e...0Chemistry.pdf
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    (Original post by Aimen.)
    Well caffeine is in dichloromethane which is the lower layer, and the seperation is in the next step!
    Ahhh so it is in the dichloromethane, I got so confused because I thought the mark scheme was saying that each one will form a layer, okay thanks!

    Ah another question, how shall I know that it forms the bottom layer ?

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    (Original post by Adorable98)
    What you wrote is right but it's not on the mark scheme for some reason & I can't find the examiner report for this paper?!
    That's okay, thank you anyway

    It seems like what I thought is correct and that caffeine dissolves in the solvent that is dichloromethane

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    (Original post by PlayerBB)
    Ahhh so it is in the dichloromethane, I got so confused because I thought the mark scheme was saying that each one will form a layer, okay thanks!

    Ah another question, how shall I know that it forms the bottom layer ?

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    If we assume that the density of the solution of caffeine and dichloromethane is approximately equal to that of the solvent, then the density of the solution is 1.32, whereas water is 1 so the dichloromethane layer will be at the bottom due to its higher density
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    (Original post by samb1234)
    If we assume that the density of the solution of caffeine and dichloromethane is approximately equal to that of the solvent, then the density of the solution is 1.32, whereas water is 1 so the dichloromethane layer will be at the bottom due to its higher density
    Ahh, Thank you!!!
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    (Original post by Aimen.)
    Here is paper, markscheme and examiner report!
    thank you so much!!
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    (Original post by sabahshahed294)
    Hi there. Can someone explain 2a (ii) please? I checked the mark scheme but I don't get the reason behind that why this is the answer?

    https://52e1064b4dc7f9fd87a96faa7f7e...0Chemistry.pdf
    Could someone answer this please?
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    (Original post by Adorable98)
    Could someone list all the topics from unit 4 and 5 that I should revise for unit 6 .. or is it everything?
    Get the specification first.

    From these, you have to learn: (where each number below is a point on the specification - read through the specification and you'll understand)
    Unit4:
    4.3c, 4.3e, 4.4g, 4.8.2c, 4.8.3d, 4.8.4.b, 4.4.4c.
    Unit5:
    5.3.1d, 5.3.1g, 5.3.2g, 5.3.2j, 5.4.1d, 5.4.2b, 5.4.2d, 5.4.2i, 5.4.3f.

    that is a lot.
    And it helps to know to know background theory too. According to my teacher edexcel likes to test theory through practicals.

    ninja edit: I got these from an old mapping document when the syllabus changed. I'm so grateful i decided to highlight them on my copy of the specification, because i lost the file.
 
 
 
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