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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).
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
Predicting Inorganic Reaction Products: A Critical Thinking Exercise in General ChemistryDavid G. DeWit Describes a course module designed to afford practice in applying the principles encountered throughout the general chemistry sequence to understanding and predicting chemical reactivity and the products of simple inorganic reactions. DeWit, David G. J. Chem. Educ.2006, 83, 1625.
Acids / Bases |
Descriptive Chemistry |
Learning Theories |
Metals |
Nonmetals |
Oxidation / Reduction |
Periodicity / Periodic Table |
Reactions
Copper Metal from Malachite circa 4000 B.C.E.Gordon T. Yee, Jeannine E. Eddleton, and Cris E. Johnson The experiment starts with a naturally occurring ore, malachite, essentially pure Cu2CO3(OH)2, which is readily available at modest cost in bead form from jewelry stores. Using only a Bunsen burner, a porcelain crucible, and a charcoal briquette, the experiment demonstrates two steps in the ancient processing of copper ore: roasting and reduction. The product is a shiny copper metal bead that can then be hammered, polished, and shown to be electrically conductive. Yee, Gordon T.; Eddleton, Jeannine E.; Johnson, Cris E. J. Chem. Educ.2004, 81, 1777.
Corrosion in AstronomyRobert Hetue A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Oxidation / Reduction |
Metals |
Astrochemistry
Common Reducing AgentsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Metals |
Oxidation / Reduction
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.
Go for the oxidation of 2 mole of silver in the following balanced reaction. 
Ca(s) + 2AgI(s) 
