Chmy 123 Exam 2

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macylynn92
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263657
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Chmy 123 Exam 2
Updated:
2014-05-13 01:52:00
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organic bio chem
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Chmy 123 exam 2
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  1. What are the relative electronegativity values for C, H, O, and N
    • H - 2.1
    • C - 2.5
    • N - 3.0
    • O - 3.5
  2. How can you tell if a covalent bond is not polar
    • es are shared equally or almost
    • there is a difference of < 0.5
  3. How can you tell if a covalent bond is polar
    there is a difference that is > 0.5 change in en.
  4. What are the valence electrons for H, C, N, O, F?
    • H=1
    • C=4
    • N=5
    • O=6
    • F=7
  5. What is a proton donor?
    Acid
  6. What is a proton acceptor?
    Base
  7. What is a conjugate acid?
    protonated form = form with the proton (H+)
  8. What is a conjugate base?
    Deprotonated form = Form without the proton
  9. What is electronegativity
    • It is the tenancy of an atom to pull electrons towards itself.
    • Electrons go to atom with higher (en)
  10. What is more polar

    Carbon Dioxide or methanal?  Why?
    Carbon dioxide because its geometry cancels out the polarity.
  11. Van der Waals
    • non-polar groups
  12. Dipole - Dipole
  13. H-Bonds
    Strongest IMAFs

    • 1) carboxylic Acid
    • 2) 1o amines
    • 3) 2amines
    • 3) Alchohols
  14. hydroohillic
    • Water loving
    • polar groups
  15. hydrophobic
    • water hating
    • non-polar groups
  16. amphiphatic
    has both polar parts and non-polar parts
  17. What is the 2nd law of thermodynamics?
    When a system containing a large amount of particles is lefts to itself, (not adding or removing energy or mass) it achieves maximum entropy (disorder/randomness)
  18. What happens when amphipathic molecules are placed in water?
    • It is driven by the 2nd law of thermodynamics
    • polar parts make H-bonds with water and non-polar parts try to minimize contact
    • can make a monolayer, bilayer, micells, or liposomes
  19. What is meant by Bronsted-Lowery?
    • They came up with the acid and base
    • bronsted-Lowry base = Proton acceptor
    • Bronsted - Lowry acid = proton donor
  20. When water participates in an acid-base reaction
    it can either donate or accept a H+, depending on what it is reacting with.
  21. nomenclature for # of carbons
    1,2,3,4,5,6,7,8,9,10
  22. pKa of carboxylic acid
    4-5
  23. How to draw and name tryglecerides
    #Cs: #C=C  c or t Δ location of C=Cs
  24. polarity
    • en <.5 nonpolar
    • en>.5 polar
  25. endergonic and exergonic
    • endergonic = requires energy
    • exergonic = energy released

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