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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.
Analysis of the Thickening Agents in Automotive Greases by GC–MSDavid Mayotte, Craig J. Donahue, and Cheryl A. Snyder Describes a laboratory procedure for the identification of the thickening agents in lubricating greases by GCMS. Mayotte, David; Donahue, Craig J.; Snyder, Cheryl A. J. Chem. Educ.2006, 83, 902.
Applications of Chemistry |
Consumer Chemistry |
Gas Chromatography |
Industrial Chemistry |
Mass Spectrometry |
Separation Science |
Fatty Acids
Lubricating Grease: A Chemical PrimerCraig J. Donahue This article provides an overview of the function, properties, composition, and preparation of lubricating grease Donahue, Craig J. J. Chem. Educ.2006, 83, 862.
Applications of Chemistry |
Industrial Chemistry |
Fatty Acids
Volatile Organic Sulfur Compounds of Environmental Interest: Dimethyl Sulfide and Methanethiol. An Introductory OverviewThomas G. Chasteen and Ronald Bentley Volatile organic sulfur compounds and their degradation products play important environmental roles in global warming, acid precipitation, and cloud formation. Two important members of this group, dimethyl sulfide, DMS, and methanethiol, MT, are formed by living organisms as well as by abiotic processes. The chemical reactions responsible for the biosynthesis of DMS and MT are emphasized here, as well as means for their degradation. Since sulfur compounds are often ignored in normal course work, this article provides a basic foundation for an understanding of these interesting and environmentally significant compounds. Chasteen, Thomas G.; Bentley, Ronald. J. Chem. Educ.2004, 81, 1524.
Go for the oxidation of 2 mole of silver in the following balanced reaction. 
Ca(s) + 2AgI(s) 
