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    (Original post by yodawg321)
    For last question

    Li: Between delocalised electrons and positive ions
    Carbon: Between carbon atoms in structure
    Flourine: Between flourine molecules as its van der waals forces
    Oh I got no marks for the last row then. For the 2nd row was it giant for the one in the middle and covalent for the one on the right?
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    (Original post by Dr. Django)
    van der waals i put
    Same here but wouldn't it be dipoles as phosphorus is more electronegative than hydrogen?


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    (Original post by Dr. Django)
    van der waals i put
    For the other one it was Hydrogen Bonding wasn't it?
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    Main forces in NH3 was Hydrogen bonds and main force in PH3 was Van Der Waals
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    (Original post by MathsNerd1)
    But it wasn't that hard, at all, if you looked into the book a few times you should've been fine, the most challenging was the last part of the last question.


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    It wasnt hard I agree, i found it decent! Not sure about the last being the most challenging though, I reckon the bond angles would have thrown quite a few people
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    (Original post by Ferrari_1996)
    For the other one it was Hydrogen Bonding wasn't it?
    Yes NH3 was Hydrogen bond and PH3 one was Van der waals'
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    What did people write for the 5 marker on reactivity of group 2 with chlorine?


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    (Original post by MathsNerd1)
    Same here but wouldn't it be dipoles as phosphorus is more electronegative than hydrogen?


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    true, hopefully VDW is ok! its non polar anyway
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    (Original post by Dr. Django)
    It wasnt hard I agree, i found it decent! Not sure about the last being the most challenging though, I reckon the bond angles would have thrown quite a few people
    I suppose but the wording was quite weird and yeah, that shouldn't have caused an issue but I assume it will with the rest of my group that sat it.


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    (Original post by Dr. Django)
    van der waals i put
    i thought that it was a permanent dipole-dipole?
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    (Original post by Dr. Django)
    true, hopefully VDW is ok! its non polar anyway
    Well I hope that it could be both as I crossed it out to put the dipoles :-/ I doubted myself and how would it be non polar if there is the electronegative differences?


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    Guys this test wasn't hard at all?

    what was the highest grade boundaries we ever had?
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    (Original post by kelvinbeyioku)
    i thought that it was a permanent dipole-dipole?
    It could be im unsure
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    (Original post by flyhigh99)
    Guys this test wasn't hard at all?

    what was the highest grade boundaries we ever had?
    Last May. It was 50/60 to get an A!
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    (Original post by MathsNerd1)
    Same here but wouldn't it be dipoles as phosphorus is more electronegative than hydrogen?


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    I put in permement dipole to dipole attractions for that. Not van der waals
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    (Original post by flyhigh99)
    Guys this test wasn't hard at all?

    what was the highest grade boundaries we ever had?
    52 in Jan 2010, but that one was insanely simple; this will be more like 50 i would have thought
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    (Original post by yodawg321)
    I put in permement dipole to dipole attractions for that. Not van der waals
    Same here! As the lone pair of electrons would make it a polar substance.


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    (Original post by Ferrari_1996)
    Oh I got no marks for the last row then. For the 2nd row was it giant for the one in the middle and covalent for the one on the right?
    Yeah I got giant and covalent.

    I might be wrong though!
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    (Original post by yodawg321)
    Yeah I got giant and covalent.

    I might be wrong though!
    i got the same
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    (Original post by MathsNerd1)
    Same here! As the lone pair of electrons would make it a polar substance.


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    Surely it will be VDW forces if it was non polar ? For example H2.
    But both the molecules had different electronegativies so it will be perm dipole to dipole attractions?
 
 
 
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