Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    0
    ReputationRep:
    (Original post by Liberty.)
    Stupidly enough I put dipole-dipole for NH3 and VDW for PH3 .
    But you're right in saying H bonds triumph VDWs surely...
    aw haha bless you,dw stress of the moment eh? so am i right or completely wrong with what i wrote in the paper?
    Offline

    0
    ReputationRep:
    This was such a 'diverse' paper with so much random question that no one can either be bothered to make a markscheme or its just to long or hard :L :P
    Offline

    0
    ReputationRep:
    (Original post by Elaineel)
    I think you are right because the question was: why does NH3 have a higher melting/boiling point? Melting point is connected with intermolecular forces, in this case hydrogen bonding is much stronger than van der waals or dipole-dipole forces. Hydrogen bonding is extra force over and above van der waals/dipole-dipole.
    your answer should be correct!

    well if your correct you made me happy :P thats like 2-3 marks aswell x
    Offline

    0
    ReputationRep:
    Guys it doesn't matter about VDW or Dipole to Dipole attraction, it is ONLY 1 mark.(I do think its perm dipole to dipole though) :P
    Offline

    2
    ReputationRep:
    i wrote induced diople for ph3 :confused:
    Offline

    2
    ReputationRep:
    (Original post by Ferrari_1996)
    Yes that's what I did.
    I thought that mol x avagadro constant = number of atoms, not number of molecules?


    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    Carbon have the same ionisation energy in all forms

    Posted from TSR Mobile
    Offline

    0
    ReputationRep:
    For the Ag and I ionic equation, did it say to put state symbols or are you just meant to know to do so? I can't remember if i put them in
    Offline

    0
    ReputationRep:
    Okay, has ANYBODY done an unofficial mark scheme? Reading all these answers is killing me!
    Offline

    2
    ReputationRep:
    (Original post by Ferrari_1996)
    I wrote that the litmus paper turned blue because an alkali was formed (or something like that). I don't know what the answer is but that's what I wrote. What did you write?
    I think you got it wrong? Sorry It actually said in the question that the litmus paper turned red :')


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    was it electron config of sulphur or silicon??
    help
    Offline

    0
    ReputationRep:
    (Original post by sab8)
    For the Ag and I ionic equation, did it say to put state symbols or are you just meant to know to do so? I can't remember if i put them in
    It was 1 mark getting the equation right, another mark for getting state symbols
    Offline

    10
    ReputationRep:
    (Original post by sesrugeda)
    I thought that mol x avagadro constant = number of atoms, not number of molecules?


    Posted from TSR Mobile
    It's for either
    http://en.wikipedia.org/wiki/Avogadro_constant
    Offline

    0
    ReputationRep:
    (Original post by scorpio22)
    was it electron config of sulphur or silicon??
    help
    PI put 1s2 2s2 2p6 3s2 3p2
    Offline

    10
    ReputationRep:
    (Original post by scorpio22)
    was it electron config of sulphur or silicon??
    help
    It think I remember it being silicon
    Offline

    2
    ReputationRep:
    (Original post by yodawg321)
    Guys it doesn't matter about VDW or Dipole to Dipole attraction, it is ONLY 1 mark.(I do think its perm dipole to dipole though) :P
    but wasn't there another mark for explanation?
    Offline

    10
    ReputationRep:
    (Original post by sesrugeda)
    I think you got it wrong? Sorry It actually said in the question that the litmus paper turned red :')


    Posted from TSR Mobile
    The reaction between CL2 + H20 ----> HCL + HCLO
    HCL is acidic so the litmus paper turned red
    Offline

    2
    ReputationRep:
    (Original post by CRW1996)
    It think I remember it being silicon

    (Original post by yodawg321)
    PI put 1s2 2s2 2p6 3s2 3p2
    pheww.
    the unofficial markscheme has sulphur.
    i was ready to cry for losing another mark.im stretching it thin already.
    Offline

    0
    ReputationRep:
    (Original post by sesrugeda)
    I thought that mol x avagadro constant = number of atoms, not number of molecules?


    Posted from TSR Mobile
    did the same mistake
    but 1 mole of SICL4 weighs (28,1+4x35,4)g - this is MOLECULAR weight so the number of moles (0.05) was connected with the number of molecules already.
    hope we could still get 2 out of three points
    Offline

    0
    ReputationRep:
    (Original post by MrJiggly)
    but wasn't there another mark for explanation?
    Na that was the question after that
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brussels sprouts
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.