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Journal Articles: 29 results
Stilling Waves with Ordered Molecular Monolayers  Ed Vitz
The amazing ability of a film of oil one molecule thick to dissipate the relatively large energy of water waves can be readily demonstrated, but an explanation of the effect has been elusive until recently.
Vitz, Ed. J. Chem. Educ. 2008, 85, 1064.
Lipids |
Molecular Properties / Structure |
Noncovalent Interactions |
Surface Science |
Water / Water Chemistry |
Fatty Acids
New Analytical Method for the Determination of Detergent Concentration in Water by Fabric Dyeing  Set Seng, Masakazu Kita, and Reiko Sugihara
This article describes a high school classroom activity in which an acrylic fabric is used as the extraction medium in the analysis of detergent concentration rather than more harmful organic solvents. An handmade reflection photometer, assembled with inexpensive materials such as LED, PVC tube, and CdS sensor, is used to determine the detergent concentration.
Seng, Set; Kita, Masakazu; Sugihara, Reiko. J. Chem. Educ. 2007, 84, 1803.
Aqueous Solution Chemistry |
Consumer Chemistry |
Dyes / Pigments |
Laboratory Equipment / Apparatus |
Quantitative Analysis |
Solutions / Solvents |
Water / Water Chemistry
Popcorn—What's in the Bag?  Marissa B. Sherman and Thomas A. Evans
Three independent activities explore microwave popcorn, the nature of the packaging, and the popcorn produced.
Sherman, Marissa B.; Evans, Thomas A. J. Chem. Educ. 2006, 83, 416A.
Carbohydrates |
Nutrition |
Physical Properties |
Solutions / Solvents |
Water / Water Chemistry
Equilibrium Constants and Water Activity Revisited  David Keeports
Subtle arguments based upon the use of chemical potentials show that numerical values of solute molar concentrations can be used as good approximate activities in equilibrium calculations for reactions involving dilute solutions.
Keeports, David. J. Chem. Educ. 2006, 83, 1290.
Acids / Bases |
Aqueous Solution Chemistry |
Equilibrium |
Water / Water Chemistry |
Alcohols
Equilibrium Constants and Water Activity Revisited  E. J. Behrman
In teaching the effects of structure on acid strength, it is useful to compare, inter alia, water with primary alcohols.
Behrman, E. J. J. Chem. Educ. 2006, 83, 1290.
Acids / Bases |
Aqueous Solution Chemistry |
Equilibrium |
Water / Water Chemistry |
Alcohols
Equilibrium Constants and Water Activity Revisited  E. J. Behrman
In teaching the effects of structure on acid strength, it is useful to compare, inter alia, water with primary alcohols.
Behrman, E. J. J. Chem. Educ. 2006, 83, 1290.
Acids / Bases |
Aqueous Solution Chemistry |
Equilibrium |
Water / Water Chemistry |
Alcohols
Introduction of Mass Spectrometry in a First-Semester General Chemistry Laboratory Course: Quantification of MTBE or DMSO in Water  Mike Solow
An experiment has been developed to introduce first-semester general chemistry students to mass spectrometry. Students analyze water samples contaminated with a known compound, either DMSO or MTBE. Students are asked to determine the concentration of the compound in the water. In performing this experiment, students should learn (i) how the mass of an atom or molecule is determined, (ii) the effect of the presence of different isotopes on molecular mass, (iii) the role of an internal standard, and (iv) how mass spectrometry is used in answering various scientific questions.
Solow, Mike. J. Chem. Educ. 2004, 81, 1172.
Instrumental Methods |
Mass Spectrometry |
Quantitative Analysis |
Water / Water Chemistry |
Gas Chromatography
Kinetics of the Osmotic Hydration of Chickpeas  Gabriel Pinto and Ali Esin
An experiment examining the swelling of chickpeas as they are soaked in water is presented to introduce students to topics such as osmotic flow, mass transfer, diffusion, kinetics of hydration, modeling, and estimation of activation energy.
Pinto, Gabriel; Esin, Ali. J. Chem. Educ. 2004, 81, 532.
Kinetics |
Water / Water Chemistry |
Food Science |
Transport Properties
Magnetic Particle Technology. A Simple Preparation of Magnetic Composites for the Adsorption of Water Contaminants  Luiz C. A. Oliveira, Rachel V. R. A. Rios, José D. Fabris, Rochel M. Lago, and Karim Sapag
In this article a simple undergraduate laboratory experiment to produce magnetic adsorbents is described. These magnetic materials efficiently adsorb contaminants from water and can be easily removed from the medium by a simple magnetic separation process.
Oliveira, Luiz C.A.; Rios, Rachel V.R.A.; Fabris, José D.; Lago, Rochel M.; Sapag, Karim. J. Chem. Educ. 2004, 81, 248.
Green Chemistry |
Magnetic Properties |
Materials Science |
Separation Science |
Water / Water Chemistry
Bubble Stripping To Determine Hydrogen Concentrations in Ground Water: A Practical Application of Henry's Law  Daniel M. McInnes and Don Kampbell
Applying Henry's law to determine the concentration of hydrogen in ground water as a means of identifying possible contamination by chlorinated organic compounds.
McInnes, Daniel M.; Kampbell, Don. J. Chem. Educ. 2003, 80, 516.
Water / Water Chemistry |
Gases |
Quantitative Analysis |
Applications of Chemistry
The Purification of Water by Freeze-Thaw or Zone Melting  James Oughton, Silas Xu, and Rubin Battino
Quantitative investigation of the purification of slat water solutions through the process of partial freezing.
Oughton, James; Xu, Silas; Battino, Rubin. J. Chem. Educ. 2001, 78, 1373.
Conductivity |
Phases / Phase Transitions / Diagrams |
Separation Science |
Quantitative Analysis |
Water / Water Chemistry |
Aqueous Solution Chemistry |
Solutions / Solvents
Spring Shock!: Impact of Spring Snowmelt on Lakes and Streams  Judith A. Halstead
This activity uses frozen vinegar to demonstrate that what melts first forms a liquid more concentrated in acetic acid than normal vinegar. As melting continues, the concentration of acetic acid decreases and the pH goes up.
Judith A. Halstead. J. Chem. Educ. 1998, 75, 400A.
Acids / Bases |
Water / Water Chemistry
The Real Reason Why Oil and Water Don't Mix  Todd P. Silverstein
Authors should remove from their textbooks the incorrect enthalpic/hydrogen-bond explanation for the hydrophobic effect. Because aspects of the correct entropic/clathrate "cage" explanation lie beyond the scope of introductory or organic chemistry courses, it may be wisest to omit any detailed physical explanation of the "like dissolves like" phenomenon.
Silverstein, Todd P. J. Chem. Educ. 1998, 75, 116.
Theoretical Chemistry |
Water / Water Chemistry |
Aqueous Solution Chemistry |
Solutions / Solvents
Integrating High School Chemistry with Environmental Studies and Research  Jack Randall
This article is a summary of a presentation made at the 1996 BCCE in Clemson, SC, as part of a symposium detailing the integration of environmental topics into Chemistry curricula. High school chemistry has long used environmental topics to enhance the study of various components of the curriculum. This article illustrates the benefits of incorporating environmental science as an integral part of a high school Chemistry course.
Randall, Jack. J. Chem. Educ. 1997, 74, 1409.
Learning Theories |
Nonmajor Courses |
Water / Water Chemistry
Standard states for water equilibrium.  Baldwin, W. George; Burchill, C. Eugene.
The authors consider that Ka and Kb values for Bronsted acids and bases in aqueous solution represent one data set describing the properties of solutes in dilute aqueous solution.
Baldwin, W. George; Burchill, C. Eugene. J. Chem. Educ. 1992, 69, 255.
Water / Water Chemistry |
Equilibrium |
Brønsted-Lowry Acids / Bases
Magic sand: Modeling the hydrophobic effect and reversed-phase liquid chromatography  Vitz, Ed
The procedures described here are meant to reveal the important "nonsolvent" properties of water through its interaction with Magic Sand, and other synthetic silica derivatives.
Vitz, Ed J. Chem. Educ. 1990, 67, 512.
Chromatography |
Water / Water Chemistry
Interfacial phenomena   Anwander, Alberto E.; Grant, Richard P. J. S.; Letcher, Trevor M.
The interfaces between liquids, and liquids and gases, have a number of possible permutations that lead to exotic phenomenon such as antibubbles, floating drops, boules, polyaphrons, and hanging air bubbles. The authors give directions for demonstrating these in the classroom or lab.
Anwander, Alberto E.; Grant, Richard P. J. S.; Letcher, Trevor M. J. Chem. Educ. 1988, 65, 608.
Surface Science |
Liquids |
Gases |
Physical Properties |
Water / Water Chemistry |
Aqueous Solution Chemistry |
Phases / Phase Transitions / Diagrams
Correct equilibrium constants for water (the authors reply)  Starkey, Ronald; Norman, Jack; Hinitze, Mark
Water and hydronium ion Ka values are special cases.
Starkey, Ronald; Norman, Jack; Hinitze, Mark J. Chem. Educ. 1987, 64, 1068.
Equilibrium |
Water / Water Chemistry |
Aqueous Solution Chemistry |
Acids / Bases |
Thermodynamics
Correct equilibrium constants for water  Baldwin, W. George; Burchill, C. Eugene
Disagreement with the numerical values assigned to equilibrium constants.
Baldwin, W. George; Burchill, C. Eugene J. Chem. Educ. 1987, 64, 1067.
Equilibrium |
Water / Water Chemistry |
Acids / Bases |
Aqueous Solution Chemistry
The effect of polarity on solubility  Nordstrom, Brian H.
Students observe that iodine dissolves readily in 1,1,1-trichloroethane but not water.
Nordstrom, Brian H. J. Chem. Educ. 1984, 61, 1009.
Precipitation / Solubility |
Solutions / Solvents |
Molecular Properties / Structure |
Water / Water Chemistry
The determination of anionic surfactants in natural and waste waters  Crisp, P. T.; Eckert, J. M.; Gibson, N. A.
The experiment described in this paper is suitable for the measurement of subpart per million concentrations of anionic surfactants in natural waters and industrial effluents.
Crisp, P. T.; Eckert, J. M.; Gibson, N. A. J. Chem. Educ. 1983, 60, 236.
Industrial Chemistry |
Water / Water Chemistry |
Surface Science
Le Chtelier's principle: A laboratory exercise  Friedman, Frederica
Le Chtelier's principle can be demonstrated by showing that water can boil at temperatures below 100C due to reduced vapor pressure.
Friedman, Frederica J. Chem. Educ. 1977, 54, 236.
Equilibrium |
Phases / Phase Transitions / Diagrams |
Gases |
Water / Water Chemistry
Non-covalent interactions: Key to biological flexibility and specificity  Frieden, Earl
Summarizes the types of non-covalent interactions found among biomolecules and how they facilitate the function of antibodies, hormones, and hemoglobin.
Frieden, Earl J. Chem. Educ. 1975, 52, 754.
Noncovalent Interactions |
Hydrogen Bonding |
Water / Water Chemistry |
Proteins / Peptides |
Amino Acids |
Molecular Properties / Structure |
Hormones
Chlorine in your water  Smith, J. G.
The use, chemistry, and alternatives to chlorine and chlorine compounds in water supplies.
Smith, J. G. J. Chem. Educ. 1975, 52, 656.
Water / Water Chemistry |
Consumer Chemistry
Efficient use of washing solvents. A quantitative treatment  Boschmann, Edwin
A quantitative study of the efficient use of washing solvents (e.g. distilled water) in the laboratory.
Boschmann, Edwin J. Chem. Educ. 1972, 49, 650.
Laboratory Management |
Water / Water Chemistry
Dissolved oxygen. A relevant experiment for the introductory laboratory  Stagg, William R.
Students measure the dissolved oxygen content of water from several natural sources as well as the change in solubility with temperature.
Stagg, William R. J. Chem. Educ. 1972, 49, 427.
Water / Water Chemistry |
Oxidation / Reduction |
Quantitative Analysis |
Solutions / Solvents |
Precipitation / Solubility |
Gases
An introductory experiment on phosphates in detergents  Mohrig, Jerry R.
Examines the phosphate controversy, the roles of phosphates in detergents, the chemistry of phosphates and their colorimetric determination, and presents an experiment in which the amount of phosphate is measured using two different analytical methods.
Mohrig, Jerry R. J. Chem. Educ. 1972, 49, 15.
Aqueous Solution Chemistry |
Water / Water Chemistry |
Consumer Chemistry |
Quantitative Analysis |
Applications of Chemistry
Is ammonia like water?  Gill, J. B.
This article sets out to compare some of the properties of the two most widely studied solvents, water and liquid ammonia, and in particular illustrate some comparative aspects that are not normally considered.
Gill, J. B. J. Chem. Educ. 1970, 47, 619.
Water / Water Chemistry |
Molecular Properties / Structure |
Aqueous Solution Chemistry
The hydrated hydronium ion  Clever, H. Lawrence
It is the purpose of this brief review to cite and discuss some of the evidence for the existence of the trihydrated hydronium ion.
Clever, H. Lawrence J. Chem. Educ. 1963, 40, 637.
Water / Water Chemistry |
Aqueous Solution Chemistry |
Acids / Bases |
Brønsted-Lowry Acids / Bases