ochem recitation

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Anonymous
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72861
Filename:
ochem recitation
Updated:
2011-03-14 14:43:41
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ochem recitation
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ochem recitation
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  1. Spectroscopy
    measurement of the interaction between electromagentic raidation (ie. light) with a molecule
  2. spectroscopy can have three outcomes
    • absorbtion
    • reflection
    • scattering
  3. absorbtion
    energy of photon brings the molecule to some higher E or excited state
  4. reflection
    beam of light comes back with same energy started with
  5. scattering
    photon has a change in direction and or Energy
  6. Radio waves
    affect nuclear spin state

    100m-0.1cm
  7. infared light
    near and far

    100nm

    effects molecular vibrational states
  8. visible light
    400nm

    electonic excitation
  9. U.V light
    400nm-10 nm

    electronic excitation...same as visible light
  10. Xrays
    nuclear diffracted (scattered)

    10nm-.01nm
  11. Gamma waves
    'DEATH'

    <0.001nm
  12. waves towards radio side have what characteristics
    F.E.W

    • Low Freq
    • Low Energy
    • High Wavelength
  13. waves towards gammam side have what characteristics
    F.E.W

    • high freq
    • hgih Energy
    • low wavelengths
  14. natural frequency
  15. Frequency at which a bond vibrates naturally
  16. A bond will absorb a photon that...
    occurs at its natural frequency
  17. Bonds act like...
    Springs
  18. Degrees of unsaturation (missing Hs)
    elements
    CnH2n+2

    • N...add 1
    • O...no change
    • X (cl,Br,I)...subtract 1
  19. Degrees of unsaturation equation
    saturated Hs-actual Hs/2

    C4H8

    • CnH2n+2......10-8/2= 1 (can be a ring or pi bond)
    • " '' ......10-6/2=2 (can be 2 rings or 2 pi bonds
  20. When there is NO dipole change...
    the molecule is NOT Infered (IR) active

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