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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.
Solutions : ReverseOsmosis (20 Variations) You are given a water sample that contains ammonium chloride (NH4Cl). You determine the concentration of the salt to be 0.500 M and decide to purify the water using reverse osmosis. What is the minimum pressure that must be applied at 30.0oC to force the water through the membrane?
JCE Resources for Chemistry and WaterErica K. Jacobsen This annotated bibliography collects the best that past issues of JCE have to offer for use with the 2008 Chemists Celebrate Earth Day theme, "Streaming Chemistry". Jacobsen, Erica K. J. Chem. Educ.2008, 85, 188.
Water / Water Chemistry
Gas Permeability of PolymersJee-Yon Lee Undergraduate students can learn what causes the helium-inflated balloon to fall in a few days through the proposed experiment. Lee, Jee-Yon. J. Chem. Educ.2005, 82, 1472.
Gases |
Transport Properties
Gas Permeability of PolymersBruno Lunelli The recent article, Applying Chemical Potential and Partial Pressure Concepts To Understand the Spontaneous Mixing of Helium and Air in a Helium-Inflated Balloon, proposes a model of permeation untenable and in contradiction with correct statements present in the same text and consequently does not consider the material of which the investigated balloons are made. Lunelli, Bruno. J. Chem. Educ.2005, 82, 1471.
Osmotic PressureEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Membranes
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.
Go for the oxidation of 2 mole of silver in the following balanced reaction. 
Ca(s) + 2AgI(s) 
