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Chapter 4

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

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  1. Chapter 4 The Bohr Model of the Atom Part 2

  2. 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.

  3. Some Uses of “Exciting” Atoms (Quantum Leaps)

  4. 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.

  5. Spectroscope

  6. The entire article is posted near the door of the classroom if you would like to read more.

  7. Fireworks

  8. 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

  9. 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.

  10. Neon Signs

  11. 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.

  12. What else can lasers be used for? Sharks

  13. I want sharks with laser beams attached to their heads.

  14. Flame Tests

  15. 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.

  16. Video: Molecular FingerprintsStudent WorksheetUse Windows Media Player

  17. 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.

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