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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.
One method for protecting metals against corrosion is to connect the metal directly to a "sacrificial anode". This is the method used to protect pipelines and ships hulls. Which of the following metals would you consider the best candidate for a sacrificial anode for a ship's hull? The hull is steel (which is mostly iron).
Consider a cell composed of the following half-reactions. Determine the
magnitude of E° for the cell and decide whether the reaction will be
product-favored or reactant-favored as written.
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
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.
Applications of Chemistry |
Coordination Compounds |
Dyes / Pigments |
Electrochemistry |
Oxidation / Reduction |
Photochemistry |
Toxicology
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.
Chromate-Dichromate (GCMP)David M. Whisnant Chromate/Dichromate: this is a resource in the collection "General Chemistry Multimedia Problems". In this problem we will study shifts in the equilibrium between chromate and dichromate. 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.
Oxidation / Reduction
Halogens and Halides (GCMP)David M. Whisnant Halogens and Halides: this is a resource in the collection "General Chemistry Multimedia Problems". In this problem we will study the oxidation-reduction reactions between the halogens and the halide ions. The halogens and halides will be dissolved in water and hexane. 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.
Oxidation / Reduction
Redox ReactionsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Go for the oxidation of 2 mole of silver in the following balanced reaction. 
Ca(s) + 2AgI(s) 
