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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.
Reactions : NanoPicOfProducts (14 Variations)
The diagram below is representative of a tiny portion of a reaction between ammonia and methane. Which of the diagrams below represents the product mixture?
A Dramatic Classroom Demonstration of Limiting Reagent Using the Vinegar and Sodium Hydrogen Carbonate ReactionRomklao Artdej and Tienthong Thongpanchang This demonstration, appropriate for high school chemistry level and recommended for a large classroom presentation, is designed to illustrate the concept of limiting reagent via a series of experiments in which increasing amounts of sodium bicarbonate are added to a fixed amount of vinegar is fixed until the volume of carbon dioxide generated remains constant. Artdej, Romklao; Thongpanchang, Tienthong. J. Chem. Educ.2008, 85, 1382.
Acids / Bases |
Food Science |
Gases |
Stoichiometry
National Chemistry WeekJCE Editorial Staff JCE offers a wealth of materials for teaching and learning chemistry available in print or at JCE Online (http://www.jce.divched.org). Here are some JCE resources for celebrating National Chemistry Week and its theme, "Having a Ball with Chemistry." JCE Editorial Staff. J. Chem. Educ.2008, 85, 1336.
Materials Science
Phenolphthalein—Pink Tornado DemonstrationBruce R. Prall This demonstration uses the vortex generated by a spinning magnetic stir bar to demonstrate Le Châtelier's principle as it applies to the phenolphthalein equilibrium in water and provides an excellent opportunity to discuss limiting and excess reagents. Prall, Bruce R. J. Chem. Educ.2008, 85, 527.
P4O10 + 6H2O
