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Some quick problems before my exam 2morrow

  1. May 9, 2004 #1
    Some quick questions before my Chem exam tomorrow. Here are some problems that were on a practice exam but I dont have the answers to them. I am stuck on all of these so i was wondering if you guys/gals can help me out with these. If you can't do all then one is fine.

    how many electrons are allowed with n=5, l=?, m_l=-2, m_s=?
    A. 3
    B. 6
    C. 10
    D. 8
    E. 25

    The pi bond in CH2NF is formed with the following orbital overlap.
    A. sp^2 - 2py
    B. 2px - 2py
    C. 2py - sp^3
    D. sp^2 - sp^2
    E. 2py - 2py

    If the allowed values of the quantum number l were all integers from 0 to n, how many orbitals are allowed with n=5?
    A. 64
    B. 36
    C. 83
    D. 49
    E. 25

    In which of the following molecules is the C to C the shortest?
    A. C2H6
    B. C2H2
    C. C2H4
    D. H3CCOOH
    E. H3CCN
  2. jcsd
  3. May 13, 2004 #2
    1,) 6 corresponding to l= 2,3,4 each with 2 spins

    2.) possible sp^2-sp^2

    3.) no of electrons

    [tex] = \sum_0^{6} (2i+1) = 36 [/tex]

    4.) triple bond will have shortest C-C distance hence C2H2
    Last edited: May 13, 2004
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