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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
Manual Data Processing in Analytical Chemistry: Linear CalibrationDora Melucci Most science students are familiar with Excel spreadsheets, but determining which of Excels statistical functions perform a calculation equivalent to a classical equation and calculating errors with Excel are not trivial exercises. Melucci, Dora. J. Chem. Educ.2008, 85, 1346.
Calibration |
Chemometrics |
Quantitative Analysis
Helping Students Assess the Relative Importance of Different Intermolecular InteractionsPaul G. Jasien A semi-quantitative model has been developed to estimate the relative effects of dispersion, dipoledipole interactions, and H-bonding on the normal boiling points for a series of simple, straight-chain organic compounds. Application of this model may be useful in addressing student misconceptions related to the additivity of intermolecular interactions. Jasien, Paul G. J. Chem. Educ.2008, 85, 1222.
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) 
