The Bohr Model of the Atom

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Chapter 4

• The Bohr Model of the Atom
• Part 2

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Quantum Leaps

• A quantum leap is a change of an electron from
  one energy state to another within an atom.
• Quantum leaps cause the absorption and emission
  of electromagnetic radiation in which excited
  atoms release small packets of electromagnetic
  energy called photons.

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Some Uses of Exciting Atoms (Quantum Leaps)
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• Spectroscopy is the study of the energy which is
  given off and absorbed when atoms go from the
  ground state to the excited state and back again.
• Spectroscopy is often used in chemistry for the
  identification of substances, through the
  spectrum absorbed or emitted.

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Spectroscope
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Hiding This Slide at this time. Can add it if we
find we have time.
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The entire article is posted on the door of the
classroom if you would like to read more.
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Fireworks
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Light Sources Mercury

• CFLs
• The average rated life of a CFL is between 8 and
  15 times that of incandescents. CFLs typically
  have a rated lifespan of between 6,000 and 15,000
  hours, whereas incandescent lamps are usually
  manufactured to have a lifespan of 750 hours or
  1,000 hours.

Mercury Vapor Lamp
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• Spectrum of a CFL bulb. The camera had a
  diffraction grating in front of the lens. The
  discrete images are produced by the different
  colors in the light, a line spectrum. An
  incandescent lamp would instead have a
  continuous band of color.

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Neon Signs
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Lasers

• You'll find them in everything from CD players to
  dental drills to high-speed metal cutting
  machines to measuring systems. Tattoo removal,
  hair replacement, eye surgery -- they all use
  lasers.

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What else can lasers be used for?

• Sharks

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I want sharks with laser beams attached to their
heads.
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Flame Tests
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Flame Tests

• A flame test is a procedure used in chemistry to
  detect the presence of certain metal ions based
  on each element's characteristic emission
  spectrum.

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Video Molecular FingerprintsStudent
WorksheetUse Windows Media Player
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Homework

• Summarize the purpose and procedure for the
  Flame Test Lab.
• Continue to work on Chapter 4 Worksheet 3.
• Study Guide Chapter 4 (2 pages) is due tomorrow.