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Exploding Soap Bubbles: Hydrogen + Oxygen A series of three videos shows that as the ratio of oxygen to hydrogen in soap bubbles increases, the explosions that occur when the bubbles are ignited get louder. (The fact that with an excess of oxygen the explosions would become softer again is not shown.) Each video is repeated with no voice-over so that only the sounds of the explosions are heard. Five still images are provided to show the stoichiometry on the molecular scale. The videos are intended to be shown in order beginning with Hydrogen Alone and ending with hydrogen plus more oxygen.
New Observations on the Copper-to-Silver-to-Gold DemonstrationDorin Bejan, Jeff Hastie, and Nigel J. Bunce This analysis of the classic copper-to-silver-to-gold demonstration describes the deposition of zinc in the form of the silver-colored alloy ?-brass, the evolution of hydrogen at the copper cathode, and the behavior of the associated electrochemical cell. Bejan, Dorin; Hastie, Jeff; Bunce, Nigel J. J. Chem. Educ.2008, 85, 1381.
Electrochemistry |
Electrolytic / Galvanic Cells / Potentials |
Oxidation State |
Oxidation / Reduction
Appreciating OxygenHilton M. Weiss Photosynthetic flora and microfauna utilize light from the sun to convert carbon dioxide and water into carbohydrates and oxygen. While these carbohydrates and their derivative hydrocarbons are generally considered to be fuels, it is the thermodynamically energetic oxygen molecule that traps, stores, and provides almost all of the energy that powers life on earth. Weiss, Hilton M. J. Chem. Educ.2008, 85, 1218.
Bioenergetics |
Metabolism |
Oxidation / Reduction |
Photosynthesis |
Thermodynamics
Construction of a Polyaniline Nanofiber Gas SensorShabnam Virji, Bruce H. Weiller, Jiaxing Huang, Richard Blair, Heather Shepherd, Tanya Faltens, Philip C. Haussmann, Richard B. Kaner, and Sarah H. Tolbert The objectives of this lab are to synthesize different diameter polyaniline nanofibers and compare them as sensor materials. Its advantages include simplicity and low cost, making it suitable for both high school and college students, particularly in departments with modest means. Virji, Shabnam; Weiller, Bruce H.; Huang, Jiaxing; Blair, Richard; Shepherd, Heather; Faltens, Tanya; Haussmann, Philip C.; Kaner, Richard B.; Tolbert, Sarah H. J. Chem. Educ.2008, 85, 1102.
Nitrogen and Its Compounds Volume 04, issue 04 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Industrial Chemistry
Nitrogen and Its Compounds Volume 05, issue 08 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Industrial Chemistry
Chemicals Used in Industry Volume 03, issue 05 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Go for the oxidation of 2 mole of silver in the following balanced reaction. 
Ca(s) + 2AgI(s) 
