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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.
Appreciating OxygenHilton M. Weiss Photosynthetic flora and microfauna utilize light from the sun to convert carbon dioxide and water into carbohydrates and oxygen. While these carbohydrates and their derivative hydrocarbons are generally considered to be fuels, it is the thermodynamically energetic oxygen molecule that traps, stores, and provides almost all of the energy that powers life on earth. Weiss, Hilton M. J. Chem. Educ.2008, 85, 1218.
Bioenergetics |
Metabolism |
Oxidation / Reduction |
Photosynthesis |
Thermodynamics
Job's Analysis of the Range of the "Dalton Syringe Rocket"Natalie Barto, Brandon Henrie, and Ed Vitz An apparatus for safely igniting fuel gas/oxygen mixtures in a syringe and measuring the distance that the syringe is propelled is presented. The distance (range) is analyzed by the method of continuous variation (Job's Method) to determine the stoichiometry of the reaction. Barto, Natalie; Henrie, Brandon; Vitz, Ed. J. Chem. Educ.2006, 83, 1505.
Gases |
Oxidation / Reduction |
Thermodynamics |
Stoichiometry
Achieving Chemical Equilibrium: The Role of Imposed Conditions in the Ammonia Formation ReactionJoel Tellinghuisen The conditions under which chemical reactions occur determine which thermodynamic functions are minimized or maximized. This point is illustrated for the formation of ammonia in the ideal gas approximation using a numerical exercise. Tellinghuisen, Joel. J. Chem. Educ.2006, 83, 1090.
Chemistry in Context, 6th Ed.Lucy Pryde Eubanks, Catherine H. Middlecamp, Carl E. Heltzel, Steven W. Keller Finds ChemEd DL resources related to the sections of the General Chemistry textbook, Chemistry in Context, 6th Ed., by Lucy Pryde Eubanks, Catherine H. Middlecamp, Carl E. Heltzel, Steven W. Keller published by McGraw-Hill, 2009.
General Chemistry, 9th EditionDarrell D. Ebbing, Steven D. Gammon Finds ChemEd DL resources related to the sections of the General Chemistry textbook, General Chemistry, 9th Edition, by Darrell D. Ebbing, Steven D. Gammon published by Houghton Mifflin Company, 2007.
Issues and Physical ScienceSEPUP Finds ChemEd DL resources related to the sections of the Physical Science textbook, Issues and Physical Science, by SEPUP published by LAB-AIDS, Inc., 2007.
Go for the oxidation of 2 mole of silver in the following balanced reaction. 
Ca(s) + 2AgI(s) 
