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Notes for chemistry: Intermolecular forces, Periodicity, and trends watch

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    It is made for the first few parts of the spec.

    I wrote it up then typed it, so I can discard the written version and save this.

    Decided to upload this for other's help.

    If there is any mistake, please notify me. Some areas are quite muddled up so people are more than welcome to edit them. If you can also, please upload them after editing them.

    Thanks
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    Here are the notes. Forgot to put them up. Sorry!
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  1. File Type: docx Intermolecular Forces_Periodicity_Trends.docx (16.4 KB, 25 views)
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    "In water, all three intermolecular forces are present, however London forces are the strongest, so it has the most relevance in terms of intermolecular forces in water."

    Ooops.
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    (Original post by Pigster)
    "In water, all three intermolecular forces are present, however London forces are the strongest, so it has the most relevance in terms of intermolecular forces in water."

    Ooops.
    But hydrogen bonding is the strongest intermolecular attraction so therefore wouldn't this be the strongest in water?
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    (Original post by Sarah_g_24)
    But hydrogen bonding is the strongest intermolecular attraction so therefore wouldn't this be the strongest in water?
    I was quoting from your Word doc.
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    (Original post by Pigster)
    "In water, all three intermolecular forces are present, however London forces are the strongest, so it has the most relevance in terms of intermolecular forces in water."

    Ooops.
    bloody me. Had it written up correct, but not typed up correct. Sorry about that.
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    (Original post by Pigster)
    I was quoting from your Word doc.
    Ahhhh I see and it's not mine haha.
    Can I just double check something, do van der Waals forces only include London dispersion forces eg. induced dipole - dipole interactions and then the permanent ones are separate from this? Thx
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    (Original post by Sarah_g_24)
    Ahhhh I see and it's not mine haha.
    Can I just double check something, do van der Waals forces only include London dispersion forces eg. induced dipole - dipole interactions and then the permanent ones are separate from this? Thx
    It depends on your exam board.

    Historically, OCR A said VdW was only London and not pd-pd. But now they (correctly) say that VdW is both pd-pd AND id-id. Pro tip: if you do OCR A, avoid the term VdW and use what it says on the spec: induced dipole dipole (or London/dispersion forces) and permanent dipole dipole. And, whilst I'm on, don't abbreviate to idd and pdd unless you've written them out in full first.

    AQA also used to call VdW as London only, but I'm not sure on them these days.
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    (Original post by Pigster)
    It depends on your exam board.

    Historically, OCR A said VdW was only London and not pd-pd. But now they (correctly) say that VdW is both pd-pd AND id-id. Pro tip: if you do OCR A, avoid the term VdW and use what it says on the spec: induced dipole dipole (or London/dispersion forces) and permanent dipole dipole. And, whilst I'm on, don't abbreviate to idd and pdd unless you've written them out in full first.

    AQA also used to call VdW as London only, but I'm not sure on them these days.
    Okay thankyou!
 
 
 

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