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Crystallization of Supersaturated Sodium Acetate A supersaturated solution of sodium acetate is poured onto one small sodium acetate crystal. Crystals form from the liquid immediately upon contact with the seed crystal. A thermometer shows that the crystallization process is exothermic. A chemical hot pack is shown as an example of a commercially available supersaturated solution.
Solutions : FreezePtDepression (20 Variations) It takes 6.86 kg of ethylene glycol (antifreeze) to decrease the freezing point of 6.50 kg of water to -25.0oF (-31.7oC). How much sodium chloride (NaCl) would it take to decrease the freezing point of 6.50 kg of water to -25.0oF? (Assuming all the salt will dissolve in that amount of water.)
Using Molecular Dynamics Simulation To Reinforce Student Understanding of Intermolecular ForcesPhillip R. Burkholder, Gordon H. Purser, and Renee S. Cole This article presents a series of experiments incorporating molecular dynamics simulations which predict the motion of chemical species based on the application of empirical rules and a physical analysis of the forces that act between the species. These motions can then be shown in vivid graphical form. Burkholder, Phillip R.; Purser, Gordon H.; Cole, Renee S. J. Chem. Educ.2008, 85, 1071.
Computational Chemistry |
Hydrogen Bonding |
Molecular Mechanics / Dynamics |
Physical Properties |
Solutions / Solvents
A Lab Experience To Illustrate the Physicochemical Principles of DetergencyJ. A. Poce-Fatou, M. Bethencourt-Núñez, C. Moreno, F. J. Moreno-Dorado, and J. J. Pinto-Ganfornina This article presents a lab to study the role of a surfactant and builder in laundry detergent efficiency as determined through measurements of the diffuse reflectances of polyester samples impregnated with linseed oil. Poce-Fatou, J. A.; Bethencourt-Núñez, M.; Moreno, C.; Moreno-Dorado, F. J.; Pinto-Ganfornina, J. J. J. Chem. Educ.2008, 85, 266.
Aqueous Solution Chemistry |
Consumer Chemistry |
Laboratory Equipment / Apparatus |
Micelles |
Surface Science |
Thermodynamics
Preparation of CdS Nanoparticles by First-Year UndergraduatesKurt Winkelmann, Thomas Noviello, and Steven Brooks First-year undergraduate students prepare bulk and nanometer-sized cadmium sulfide clusters within water-in-oil micelles and calculate particle size using the effective mass model. Winkelmann, Kurt; Noviello, Thomas; Brooks, Steven. J. Chem. Educ.2007, 84, 709.
SolutionsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Solutions / Solvents
Measuring the Composition of a SolutionEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Solutions / Solvents
Ideal Solutions: Raoult's LawEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
