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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.
Preparation of Conducting Polymers by Electrochemical Methods and Demonstration of a Polymer BatteryHiromasa Goto, Hiroyuki Yoneyama, Fumihiro Togashi, Reina Ohta, Akitsu Tsujimoto, Eiji Kita, and Ken-ichi Ohshima The electrochemical polymerization of aniline and pyrrole, and demonstrations of electrochromism and the polymer battery effect, are presented as demonstrations suitable for high school and introductory chemistry at the university level. Goto, Hiromasa; Yoneyama, Hiroyuki; Togashi, Fumihiro; Ohta, Reina; Tsujimoto, Akitsu; Kita, Eiji; Ohshima, Ken-ichi. J. Chem. Educ.2008, 85, 1067.
Aromatic Compounds |
Conductivity |
Electrochemistry |
Materials Science |
Oxidation / Reduction |
Polymerization
Metal Electrodeposition on an Integrated, Screen-Printed Electrode AssemblyYieu Chyan and Oliver Chyan Screen-printed, carbon strip electrodes illustrate the essential concepts of electrochemistry and electrodeposition; their light weight facilitates sensitive measurements of electrodeposited metal, allowing for the exploration of Faraday's law and electrodeposition efficiency. Chyan, Yieu; Chyan, Oliver. J. Chem. Educ.2008, 85, 565.
Electrochemistry |
Metals |
Oxidation / Reduction |
Quantitative Analysis
Mercury Beating Heart: Modifications to the Classical DemonstrationMetodija Najdoski, Valentin Mirceski, Vladimir M. Petruševski, and Sani Demiri The classic mercury beating heart demonstration is modified with various electrolytes. Najdoski, Metodija; Mirceski, Valentin; Petruševski, Vladimir M.; Demiri, Sani. J. Chem. Educ.2007, 84, 1292.
Reduction of MetalsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Industrial Chemistry |
Metallurgy
Things We Use Volume 03, issue 01 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Metallurgy |
Consumer Chemistry |
Industrial Chemistry
Copper, Brass, Bronze Volume 03, issue 25 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.