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Lecture Notes for CHEM 152 - GENERAL CHEMISTRY at Washington (UW)

Notes Information

Material Type:Class Note
Professor:Staff
Class:CHEM 152 - GENERAL CHEMISTRY
Subject:Chemistry
University:University of Washington - Seattle
Term:Summer 2007
Keywords:
  • Electromagnetic Radiation
  • John Dalton
  • Historical Background
  • Catastrophe
  • Ultraviolet
  • Photoelectric Effect
  • Observation
  • Electrolysis
  • Blackbody Radiation
  • The Nucleus
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Sample Document Text

Lecture 16: Atomic Theory and Electromagnetic Radiation . Reading: Zumdahl (2.5), 12.1, 12.2 . Outline - Historical Background - The nature of electromagnetic radiation. - Light as energy. - The workfunction of metals. Fundamental Questions . What is matter? . What are its constituents? . What laws govern its behavior? . Thermodynamics dealt with behavior of macroscopic systems. . Atomic theory deals with submicroscopic systems (atoms, molecules, etc.) Historical Background . The Greeks proposed 4 elements - Earth, air, fire and water . Antoine Lavoisier (1743 - 1794) - Established concept of elements - Identified many elements (O, N, H, S, P) . John Dalton (1766 - 1844) - Postulated existence of atoms (in modern sense) - Compounds are combinations of different atoms in definite proportions. . Do atoms have parts? Electron . Originally proposed as a unit of electricity (G.J. Stoney, 1874) . An electron was amount of electricity necessary to liberate one atom during elect...

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