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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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    Boiling point in halogenoalkanes, it is the one with the longest chain that has the highest ? and is it higher than alkanes?
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    Good luck everyone I'm going off now!
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    (Original post by Maybenexttime)
    Guys do we need to know any apparatus for experiments? Like how to set-up an experiment with labelled diagrams? If so, please explain what we need to know! Thanks!

    Can somebody please answer, thanks!
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    (Original post by marseille_h)
    Boiling point in halogenoalkanes, it is the one with the longest chain that has the highest ? and is it higher than alkanes?
    Yes, longer --> more electrons --> stronger London forces.
    Halogenoalkanes do have a higher boiling point that alkanes because they also have permanent dipole - permanent dipole interactions.
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    (Original post by Tuya)
    We have to wait till tomorrow to discuss it right?


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    Correct.
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    (Original post by Kurraiyo)
    Yes, longer --> more electrons --> stronger London forces.
    Halogenoalkanes do have a higher boiling point that alkanes because they also have permanent dipole - permanent dipole interactions.
    Thanks !
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    (Original post by Maybenexttime)
    Can somebody please answer, thanks!
    Distillation apparatus
    Apparatus for preparation of halogenoalkane
    Apparatus for refluxing
    Apparatus for distilling your product
    Apparatus for collecting gas over water

    You should be safe with these. Let me know if you need to know what one looks like and I'll draw it out but please don't ask for all haha


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    Best of luck guys !
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    (Original post by Matterhorn)
    Distillation apparatus
    Apparatus for preparation of halogenoalkane
    Apparatus for refluxing
    Apparatus for distilling your product
    Apparatus for collecting gas over water

    You should be safe with these. Let me know if you need to know what one looks like and I'll draw it out but please don't ask for all haha


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    Can you draw the 2nd one please?


    Posted from the TSR iPad app
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    (Original post by Big-Daddy)
    Here's your answer:







    It's colourless in acid, pink in neutral conditions and red in alkali.
    Can you pleas explain?
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    K good luck guys, hope you all absolutely smash it! x
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    Guys I don't know why Fluoromethane is insoluble in water? I know the rule about Haloalkanes being insoluble but surely Fluorine can hydrogen bond with the H atoms in Water molecules? Help please. Thanks!
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    may be a stupid question, is there any quick way to decide how many hydrogen bonds a compound can form?
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    (Original post by GCSE-help)
    Guys I don't know why Fluoromethane is insoluble in water? I know the rule about Haloalkanes being insoluble but surely Fluorine can hydrogen bond with the H atoms in Water molecules? Help please. Thanks!
    I am confused about this too.

    I though any molecule that can form hydrogen bonds with water or that can react with water is soluble?

    Maybe the pd-pd bond is too strong to break to dissolve?
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    (Original post by StUdEnTIGCSE)
    I am confused about this too.

    I though any molecule that can form hydrogen bonds with water or that can react with water is soluble?

    Maybe the pd-pd bond is too strong to break to dissolve?
    I understand it now, it's because of the lack of a delta positive Hydrogen atom in Fluoromethane.
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    shouldnt this thread be locked now?
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    (Original post by GCSE-help)
    I understand it now, it's because of the lack of a delta positive Hydrogen atom in Fluoromethane.
    since fluorine is not bonded to a hydrogen atom in fluoromethane
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    can anyone help with how to decide how many h bonds a compound can form?
    • PS Reviewer
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    PS Reviewer
    The thread will be locked at around 1.30pm/2pm.

    I'm taking this exam at 1.30, I know other schools have it at 2pm.
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    Good luck guys =)
 
 
 
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