20.3. Excited Electronic States: Electronic Spectroscopy of Molecules
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Ozone: Absorbance of UV Light Ozone is produced. Exposure to a shortwave ultraviolet source causes the ozone to cast a shadow against a fluorescent yellow background.
Atmospheric Chemistry |
Photochemistry
Hydrogen + Chlorine Cannon When a corked test tube containing a mixture of hydrogen and chlorine is struck by light from a burning magnesium ribbon, the resulting explosion propels the cork out of the test tube.
Gases |
Photochemistry |
Reactions
Journal Articles: First 3 results.
Pedagogies:
Prussian Blue: Artists' Pigment and Chemists' SpongeMike Ware The variable composition of Prussian blue tantalized chemists until investigations by X-ray crystallography in the late 20th century explained its many properties and uses. Ware, Mike. J. Chem. Educ.2008, 85, 612.
Cannon (GCMP)David M. Whisnant H2 and Cl2 cannon: this is a resource in the collection "General Chemistry Multimedia Problems". In this problem we observe the reaction of hydrogen and chlorine and explore some related reactions. The reaction involves a radical mechanism initiated by light. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.
Photochemistry
Prophine and ProtoporphyrinWilliam F. Coleman, Randall J. Wildman The WebWare molecules this month are from the article "Photochemotherapy: Light-Dependent Therapies in Medicine" by Edward P. Zovinka and Danielle R. Suneri. The first is a simple porphine, illustrating the ubiquitous four-nitrogen macrocycle, while the second is the protoporphyrin found in heme systems.
Medicinal Chemistry |
Photochemistry
Photoelectric EffectWilliam F. Coleman This is a series of simulations of aspects of the photoelectric effect. There is an animation of the experiment with four choices of incident radiation - low and high intensity "red", to represent low energy light and low and high intensity "blue" to represent higher energy light. Electron production is animated and there is an ammeter to simulate current flow. Additional simulations show the effect of light frequency and intensity. There is a link to a spreadsheet that allows students to choose a sample from among five metals. The spreadsheet includes several questions to be answered after working through the materials.
