Chemistry

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Author:
littledevil_withwings
ID:
48271
Filename:
Chemistry
Updated:
2010-11-11 15:56:18
Tags:
Electronic Structure
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Description:
Chapter 6
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  1. Symbol for frequency?
    v
  2. Symbol for wavelength?
    lambda
  3. Speed of light?
    3.00 x 108 m/s
  4. Relationship between wavelength and frequency?
    c = (wavelength)(frequency)
  5. EM Radiation Experiments? (hint: 3)
    • - Blackbody Radiation
    • - Photoelectric Effect
    • - Emmission Spectrum of gases
  6. Blackbody Radiation?
    • ~ EM Radiation comes from objects that have been heated
    • ~ high frequency, (short wavelength) has a high energy
    • - the inverse is also true -
  7. Planck's Constant (h)
    6.626 x 10-34 J*s
  8. Photoelectric Effect?
    • tiny packets of light, photons, have own unique energy
    • Ephoton = hv
    • photons behave like particles and like waves (duality)
  9. Emission Spectrum of Gases?
    • Excited atoms emit light at discrete wavelengths
    • every atom gives unique emission spectrum
    • E = hc/lambda
  10. principle quantum number n
    • "orbits" of specific size where the energy of the electrons depends on n
    • lower n = lower E and the orbit is closer to the nucleus
  11. what causes the "lines" in emission spectra?
    • When an electron falls back to the ground state from an excited state the E emitted as a quantum of light, or photon.
    • this photon represents the "lines".
  12. The amount of E absorbed or emitted in promoting or demoting electrons within allowed n levels
    Change in E = Ef - Ei = [(-RH/n2f) - (-RH/n2i)]
  13. Rydberg constant
    RH = 2.18 x 10-18J
  14. Based on the equation, if the change in E is less than 0 and E is given off this is an
    emission spectrum
  15. Based on the equation, if the change in E is greater than 0 and E is absorbed this is an
    absorption spectrum
  16. Based on the equation, if the final energy level is infinity, the electron has been removed completely
    ionization energy
  17. What is the relationship between mass and wavelength?
    wavelength = h/mass x velocity
  18. Heisenberg's Uncertainty Principle
    uncertainty in position x energy (or momentum) is greater than or equal to h/4 pie
  19. wave function
    the mathematical equation that describes the electrons
  20. Angular Momentum Quantum Number (l)
    • defines the shape of the orbital
    • range from 0 to n-1
    • we use letter designations in place of l

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