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Optional spectra slides


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Optional spectra slides

  1. 1. Spectra<br />
  2. 2. Newton – split sunlight<br />Actually sunlight is not continuous – there are missing wavelengths<br />-- Fraunhofer lines – explanation will relate to the info in this chapter<br />
  3. 3. Chemists split light by using prisms or diffraction gratings<br />You can look at the spectral lines of fluorescent light bulbs by using a “CD” – the lines on the CD are comparable to a diffraction grating<br />
  4. 4. Flame tests aand spectra tubes<br />
  5. 5. Pg 136<br />Spectra<br />White light – continuous spectrum<br />Heated matter also continuous<br />1879<br /><br />
  6. 6. Spectra of gaseous atoms – not continuous<br />Light from fluorescent bulb reflected<br />Off CD - NOT conintuous<br />Mercury vapor<br />uncoated<br />Buying light bulbs<br />
  7. 7. Color related to temperatureFluorescent bulbs – color rated by temp<br />3000K Kitchen/bath<br />4200 K cool white<br />5000K sunshine<br />6500 K Daylight<br />Higher temp – more blue – more balanced<br />Lower temperatures, less blue – more “yellowish”<br />GE black light 368 nm<br />
  8. 8.
  9. 9. Hydrogen spectra lines<br />Light separated by prism or <br />Diffraction grating<br />
  10. 10. Explanation of these spectral lines<br />H atom – <br />1 p 1e<br />Review Ch 2 sec 2, Atom video (WOC)<br />Thomson’s electron, Rutherford nuclear model<br />Bohr model of H atom – to explain spectra<br />Proton surrounded by electron<br />Electron revolve around proton <br />At specific distances <br />With specific energies<br />Can move from energy level to energy level<br />
  11. 11. Bohr MODEL<br />Thomson<br />Absorption<br />Emission<br />QM<br />Explanation of H spectral lines<br />