Turn on thread page Beta

Chem edexcel, Does anyone know...... watch

Announcements
    • Thread Starter
    Offline

    0
    ReputationRep:
    ....the shape and bond angles of PF6-? Is it octahedral or does the - repel the other bonds?

    Also, why would you expect urea to be water soluble?


    These are from edexcel papers I dont have the markscheme for. Any help appreciate!
    Offline

    2
    ReputationRep:
    (Original post by ianaf18)
    ....the shape and bond angles of PF6-? Is it octahedral or does the - repel the other bonds?

    Also, why would you expect urea to be water soluble?


    These are from edexcel papers I dont have the markscheme for. Any help appreciate!
    yes it has 6 bond pairs, so it is octahedral to minimise repulsion between electrons

    urea is NH2CONH2, so it can form hydrogen bonds with water molecules
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thank you!

    I just thought that maybe the negative charge on one of the F's would repel the other bonds.

    Cheers mate.
    Offline

    2
    ReputationRep:
    (Original post by ianaf18)
    Thank you!

    I just thought that maybe the negative charge on one of the F's would repel the other bonds.

    Cheers mate.
    the negative charge is used for forming a bond

    P has one 5 outer electrons and it is not enough to form 6 covalent bonds.
    so the negative charge makes this possible
    Offline

    0
    ReputationRep:
    not only is it hydrogen bonded but the o-h bond and he molecule overall is polar and therefore dissolves in a polar substance such as water
 
 
 

University open days

  • University of East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 30 Jan '19
  • Aston University
    Postgraduate Open Day Postgraduate
    Wed, 30 Jan '19
  • Solent University
    Careers in maritime Undergraduate
    Sat, 2 Feb '19
Poll
Brexit: Given the chance now, would you vote leave or remain?

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

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