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Edexcel - Chemistry Unit 2 - 4 June 2013 Watch

  • View Poll Results: Which topic(s) are you finding most difficult?
    Shapes of molecules and ions
    11.66%
    Intermediate bonding and bond polarity
    15.95%
    Intermolecular forces
    9.82%
    Redox
    17.79%
    Group 2 & 7
    40.49%
    Kinetics & Equilibria
    14.11%
    Organic Chemistry - Alcohols and Halogenoalkanes
    39.26%
    Mechanisms
    26.38%
    Green Chemistry
    28.83%

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    (Original post by charlieejobson)
    what topic does everyone find the hardest?
    i dont like deciding which intermolecular force is dominating in a particular molecule. i also hate green chemistry, and the periodic table chapter (2 and 7)
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    (Original post by SKK94)
    In QWC (*) questions are we allowed to write in bullet points?
    I think they usually expect continuous prose.
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    (Original post by Gnome :))
    I think they usually expect continuous prose.
    Oh ok. :/
    Does the same apply to other subjects too?
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    (Original post by HarryMWilliams)
    The George Facer book has far too much information on in relation to the specification - if it isn't in the spec, then by all means read over it and get a general idea, but dont prioritise it over explicitly mentioned material.
    will do, tnx.

    I hope i finnish by friday so I can focus on my PHy and M2 exam never ending revision
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    (Original post by SKK94)
    Oh ok. :/
    Does the same apply to other subjects too?
    I believe it does for the QWC questions at least.

    However, you don't normally get more than 1 mark for QWC per question with an asterisk, so it's up to you- if you feel you'll have more time and pick up more content marks by using bullet points, they'll still mark it
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    (Original post by Gnome :))
    I believe it does for the QWC questions at least.

    However, you don't normally get more than 1 mark for QWC per question with an asterisk, so it's up to you- if you feel you'll have more time and pick up more content marks by using bullet points, they'll still mark it
    Thanks. I just wanted to make sure.
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    Why 1-iodobutane has a higher
    Boiling temp. than 1-chlorobutane? I thought C-I bond is weaker which means lower boiling temp..am i using the wrong concept?
    Posted from TSR Mobile
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    (Original post by jojo1616)
    Why 1-iodobutane has a higher
    Boiling temp. than 1-chlorobutane? I thought C-I bond is weaker which means lower boiling temp..am i using the wrong concept?
    Posted from TSR Mobile
    The C-I bond is weaker, so you are right on that, but you are thinking of the bond strength, this bond doesnt break when they are boiled. You have to think about inter molecular forces. Because when you boil something you are separating the molecules, not the atoms in the molecules.

    London forces, Permanent dipoles and Hydrogen bonds.
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    Can someone draw out the Sn2 reaction for water and a halogenoalkane for me? I'm a bit confused on charge x_x Thanks
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    (Original post by jojo1616)
    Why 1-iodobutane has a higher
    Boiling temp. than 1-chlorobutane? I thought C-I bond is weaker which means lower boiling temp..am i using the wrong concept?
    Posted from TSR Mobile
    I think beaver_tron has corrected you on your misconception of factors that effect boiling temperature.

    But forgot to add...
    Iodine has more electrons therefore greater London forces
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    (Original post by SKK94)
    LiAlH4, in dry ether.
    Yah. People seem to forget the "in dry ether" bit at my Sixth Form.
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    (Original post by Gnome :))
    Can you be a little more specific please? Any particular calculations you're stuck with?
    yeah like titration ones and mols
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    (Original post by wbrian)
    yeah like titration ones and mols
    If you post a question, with your working and what you're struggling with, I'll try and help you
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    Anyone know how to do this question?

    Propanal, CH3CH2CHO, and propanone, CH3COCH3, are isomers, but only propanal has
    a significant peak in its mass spectrum at mass/charge ratio
    A 15
    B 29
    C 43
    D 58

    With B being the answer
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    Oh sorry I don't know what I was doing, I get it now.. lol
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    Does anyone want a copy of the January 2013 paper?
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    (Original post by Jayqwe)
    Anyone know how to do this question?

    Propanal, CH3CH2CHO, and propanone, CH3COCH3, are isomers, but only propanal has
    a significant peak in its mass spectrum at mass/charge ratio
    A 15
    B 29
    C 43
    D 58

    With B being the answer
    A peak at 29 would correspond to a CH3CH2- group, which only propanal has.
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    (Original post by Jayqwe)
    Does anyone want a copy of the January 2013 paper?
    Yes Please
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    Here you go:
    Attached Images
  1. File Type: pdf Chem Unit 2 Jan. 2013 QP.pdf (444.7 KB, 87 views)
  2. File Type: pdf Chem Unit 2 Jan. 2013 MS.pdf (222.4 KB, 73 views)
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    (Original post by Jayqwe)
    Here you go:
    Thank you :hugs:
 
 
 
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