TIGER

Journal Articles: 24 results
Gas Permeability of Polymers  Jee-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 Polymers  Bruno 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.
Gases |
Transport Properties
Gas Permeability of Polymers  Bruno Lunelli
By studying a number of soft drinks with color but with or without phosphoric acid, the authors have determined that the required 20-fold dilution required in the Determination of Phosphorus in Cola Drinks is not to dilute the color but merely to place the sample within the calibration range of the analysis.
Lunelli, Bruno. J. Chem. Educ. 2005, 82, 1471.
UV-Vis Spectroscopy |
Instrumental Methods |
Gases |
Transport Properties
Applying Chemical Potential and Partial Pressure Concepts To Understand the Spontaneous Mixing of Helium and Air in a Helium-Inflated Balloon  Jee-Yon Lee, Hee-Soo Yoo, Jong Sook Park, Kwang-Jin Hwang, and Jin Seog Kim
In developing this laboratory, our initial motivation for the analysis of gases in a balloon was to answer simple and basic questions, such as, Why does a helium-charged balloon left in the air always drop in a few days? Is leakage of helium the only cause of the drop? What is the composition of the gas in the balloon when it falls after deflation? Students were intrigued by these questions, too, as they analyzed the variation over time in the composition in a balloon inflated with helium. Using the concepts of partial pressure and chemical potential, the laboratory experiment described effectively investigates the diffusion process and the behavior of gas molecules for teaching these concepts in general and physical chemistry.
Lee, Jee-Yon; Yoo, Hee-Soo; Park, Jong Sook; Hwang, Kwang-Jin; Kim, Jin Seog. J. Chem. Educ. 2005, 82, 288.
Transport Properties |
Gases |
Mass Spectrometry |
Quantitative Analysis
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
Diffusion of Water through a Differentially Permeable Membrane  Maria Guadalupe Bertoluzzo, Fabio E. Quattrin, Stella Maris Bertoluzzo, and Ruben Rigatuso
Students investigate the process of osmosis through the differentially-permeable membrane formed by copper(II) hexacyanoferrate(II), a colloidal precipitate.
Bertoluzzo, Maria Guadalupe; Quattrin, Fabio E.; Bertoluzzo, Stella Maris; Rigatuso, Ruben. J. Chem. Educ. 2003, 80, 1032A.
Transport Properties |
Mechanisms of Reactions
The Fizz Keeper, a Case Study in Chemical Education, Equilibrium, and Kinetics  Reed Howald
The chemistry of the loss of carbonation from carbonated beverages on storage is considered. Increasing the pressure of CO2(g) will restore carbonation, but an increase in pressure adding air should not affect the equilibria. It can and does, however, affect the kinetics-the rate at which a new equilibrium is established. Thus the Fizz Keeper is effective for storage of resealed pop containers for hours, but not for periods of weeks or months.
Howald, Reed. J. Chem. Educ. 1999, 76, 208.
Transport Properties |
Equilibrium |
Gases |
Kinetics |
Aqueous Solution Chemistry |
Consumer Chemistry |
Applications of Chemistry
Graham's Law and Perpetuation of Error  Stephen J. Hawkes
Grahams Laws of effusion and diffusion are used in recent articles for traditional experiments to which they do not in fact apply and for which they give the wrong answer.
Hawkes, Stephen J. J. Chem. Educ. 1997, 74, 1069.
Gases |
Chemometrics |
Transport Properties
A liquid-phase diffusion experiment  Nemetz, Thomas M.; Ball, David W.
Substituting liquid-phase diffusion of various aqueous ions for classic gas-phase diffusion of HCL and NH4Cl to illustrate Graham's Law of Diffusion; sample data and analysis included.
Nemetz, Thomas M.; Ball, David W. J. Chem. Educ. 1995, 72, 244.
Transport Properties |
Gases
An Oscillating Reaction as a Demonstration of Principles Applied in Chemistry and Chemical Engineering  Weimer, Jeffrey J.
Platinum catalyzed decomposition of methanol.
Weimer, Jeffrey J. J. Chem. Educ. 1994, 71, 325.
Thermodynamics |
Catalysis |
Transport Properties |
Kinetics |
Reactions
Overhead projection of Graham's law of gaseous diffusion  Epp, Dianne N.
Demonstration of gaseous diffusion through the combination of NH3 and HCl to produce NH4Cl.
Epp, Dianne N. J. Chem. Educ. 1990, 67, 1061.
Gases |
Transport Properties
The BedBugs game: A molecular motion simulator  Hogue, Lynn; Williams, John P.
Using the electronic game BedBugs to simulate molecular motion and illustrate diffusion, effusion, and Graham's law.
Hogue, Lynn; Williams, John P. J. Chem. Educ. 1990, 67, 585.
Kinetic-Molecular Theory |
Transport Properties
Molecular diffusion coefficients: Experimental determination and demonstration.  Fate, Gwendolyn; Lynn, David G.
This demonstration highlights the dependence of molecular transport on molar mass and temperature.
Fate, Gwendolyn; Lynn, David G. J. Chem. Educ. 1990, 67, 536.
Transport Properties |
UV-Vis Spectroscopy |
Molecular Properties / Structure
Osmosis and diffusion (Chandler, James)  Pryde, Lucy T.; Powers, George B.
Two comprehensive reviews of a software program that illustrates experimental simulation covering concepts of diffusion, osmosis, random motion, and the properties of cell plasma membranes.
Pryde, Lucy T.; Powers, George B. J. Chem. Educ. 1988, 65, A22.
Transport Properties
Diffusion of gases - Kinetic molecular theory of gases  Schlecht, K. D.
Changing the pressure inside a container with a porous surface through the diffusion of hydrogen or helium.
Schlecht, K. D. J. Chem. Educ. 1984, 61, 251.
Gases |
Transport Properties |
Kinetic-Molecular Theory
The gases of life  J. Chem. Educ. Staff
Considers the topics of diffusion, oxygen transport through the lungs, oxygen in arterial blood, and CO2 transfer.
J. Chem. Educ. Staff J. Chem. Educ. 1979, 56, 748.
Gases |
Transport Properties |
Equilibrium
Are we teaching the most useful ideas about transport?  Plumb, Robert C.; Goldberg, Paul
Argues that Einstein's laws of diffusion are more important than Graham's law of diffusion.
Plumb, Robert C.; Goldberg, Paul J. Chem. Educ. 1972, 49, 112.
Transport Properties
Are we teaching the most useful ideas about transport?  Plumb, Robert C.; Goldberg, Paul
Argues that Einstein's laws of diffusion are more important than Graham's law of diffusion.
Plumb, Robert C.; Goldberg, Paul J. Chem. Educ. 1972, 49, 112.
Transport Properties
Demonstration notes: Spontaneous combustion  Johnson, Joseph E.
Modifications or additions to previously published demonstration.
Johnson, Joseph E. J. Chem. Educ. 1970, 47, A439.
Oxidation / Reduction |
Reactions |
Gases |
Transport Properties |
Coordination Compounds
Diffusion of potassium permanganate as a lecture demonstration  Conard, C. R.; Bent, H. E.
Dropping crystals of potassium permanganate into a tall column of water leads to the slow dissolution and diffusion of the potassium permanganate throughout the column over a semester's time.
Conard, C. R.; Bent, H. E. J. Chem. Educ. 1969, 46, 758.
Transport Properties |
Aqueous Solution Chemistry |
Kinetic-Molecular Theory |
Solutions / Solvents |
Liquids
A simple vacuum apparatus for lecture experiments  Peterson, L. K.; Ruddy, F. H.
Describes a simple vacuum apparatus and examples of its use in lecture situations.
Peterson, L. K.; Ruddy, F. H. J. Chem. Educ. 1968, 45, 742.
Laboratory Equipment / Apparatus |
Gases |
Liquids |
Physical Properties |
Transport Properties |
Stoichiometry |
Calorimetry / Thermochemistry
The range of validity of Graham's Laws  Kirk, A. D.
It is the purpose of this article to discuss effusion, diffusion, and some related processes and to outline the range of validity of Graham's law.
Kirk, A. D. J. Chem. Educ. 1967, 44, 745.
Gases |
Transport Properties
Graham's Laws of diffusion and effusion  Mason, E. A.; Kronstadt, Barbara
The purpose of this article is to review Graham's laws of diffusion and effusion, offer simple but essentially correct theoretical explanations for both laws, and to present experiments on the diffusion law.
Mason, E. A.; Kronstadt, Barbara J. Chem. Educ. 1967, 44, 740.
Transport Properties |
Gases
Letters  Mysels, Karol J.
The author seeks to clarify the distinctions to be made between the concepts of diffusion and convection, which he claims were obscured by an earlier published set of TOPS demonstrations.
Mysels, Karol J. J. Chem. Educ. 1964, 41, 575.
Transport Properties