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Chapter 4. The Bohr Model of the Atom Part 2. Quantum Leaps. A quantum leap is a change of an electron from one energy state to another within an atom.

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chapter 4

Chapter 4

The Bohr Model of the Atom

Part 2

quantum leaps
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.
slide4

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.
light sources mercury
CFL’s

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.

Light Sources – Mercury

Mercury Vapor Lamp

slide9
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.
lasers
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.
flame tests1
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.
homework
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.