| Journal Articles: 36 results |
|
|
Helping Students Assess the Relative Importance of Different Intermolecular Interactions Paul G. Jasien
A semi-quantitative model has been developed to estimate the relative effects of dispersion, dipoledipole interactions, and H-bonding on the normal boiling points for a series of simple, straight-chain organic compounds. Application of this model may be useful in addressing student misconceptions related to the additivity of intermolecular interactions.
Jasien, Paul G. J. Chem. Educ. 2008, 85, 1222.
Chemometrics |
Molecular Properties / Structure |
Noncovalent Interactions |
Physical Properties
|
Determination of the Formula of a Hydrate: A Greener Alternative Marc A. Klingshirn, Allison F. Wyatt, Robert M. Hanson, and Gary O. Spessard
This article describes how the principles of green chemistry were applied to a first-semester, general chemistry courses, specifically in relation to the determination of the formula of a copper hydrate salt that changes color when dehydrated and is easily rehydrated with steam.
Klingshirn, Marc A.; Wyatt, Allison F.; Hanson, Robert M.; Spessard, Gary O. J. Chem. Educ. 2008, 85, 819.
Gravimetric Analysis |
Green Chemistry |
Solids |
Stoichiometry
|
Concept Maps for General Chemistry Boyd L. Earl
Two concept maps have been developed to represent the organization of the material in a first-semester general chemistry course. By providing these maps to students and referring to them in class, it is hoped that the instructor can assist students in maintaining a grasp of the "big picture" during the progress of the course.
Earl, Boyd L. J. Chem. Educ. 2007, 84, 1788.
Atomic Properties / Structure |
Gases |
Molecular Properties / Structure |
Stoichiometry |
Periodicity / Periodic Table
|
Mole City: A Stoichiometric Analogy Addison Ault
Offers an analogy to illustrate one of chemistry's most fundamental concepts and skills.
Ault, Addison. J. Chem. Educ. 2006, 83, 1587.
Stoichiometry
|
A Laboratory Experiment Using Molecular Models for an Introductory Chemistry Class Shahrokh Ghaffari
Presents a new approach to using molecular models in teaching general chemistry concepts. Students construct molecular models and use them to balance simple chemical equations, demonstrate the law of conservation of mass, and discover the relationship between the mole and molecules and atoms.
Ghaffari, Shahrokh. J. Chem. Educ. 2006, 83, 1182.
Molecular Modeling |
Stoichiometry |
Student-Centered Learning
|
Further Analysis of Boiling Points of Small Molecules, CHwFxClyBrz Guy Beauchamp
Multiple linear regression analysis has proven useful in selecting predictor variables that could significantly clarify the boiling point variation of the CHwFxClyBrz molecules.
Beauchamp, Guy. J. Chem. Educ. 2005, 82, 1842.
Chemometrics |
Physical Properties |
Hydrogen Bonding |
Molecular Properties / Structure |
Alkanes / Cycloalkanes
|
Stoichiometry of Calcium Medicines Gabriel Pinto
Calcium supplements provide an excellent context in which to review most of the core content of general chemistry, namely, stoichiometry, concentration units, hydration of salts, inorganic and organic salts, physiological importance of elements, resonance in ions, geometry of polyatomic ions, and isomerism.
Pinto, Gabriel. J. Chem. Educ. 2005, 82, 1509.
Stoichiometry |
Applications of Chemistry |
Drugs / Pharmaceuticals |
Medicinal Chemistry
|
Mass Relationships in a Chemical Reaction: Incorporating Additional Graphing Exercises into the Introductory Chemistry Laboratory Stephen DeMeo
The purpose of this article is to increase student involvement with graph construction specifically in the context of introductory laboratory activities that involve mass relationships between reacting substances and products. In this regard, five massmass plots derived from a synthesis of a binary compound from its elements are presented as well as a set of questions to focus learners on the significance of each plot. The benefit of providing learners with these types of graphing activities include the use of higher-order cognitive processes as well as the elucidation of fundamental chemical knowledge such as the law of the conservation of mass, the law of constant composition, limiting and excess reactants, and empirical formula.
DeMeo, Stephen. J. Chem. Educ. 2005, 82, 1219.
Stoichiometry |
Oxidation / Reduction |
Reactions |
Quantitative Analysis
|
Cross-Proportions: A Conceptual Method for Developing Quantitative Problem-Solving Skills Elzbieta Cook and Robert L. Cook
This paper focuses attention on the cross-proportion (C-P) method of mathematical problem solving, which was once widely used in chemical calculations. We propose that this method regain currency as an alternative to the dimensional analysis (DA) method, particularly in lower-level chemistry courses. In recent years, the DA method has emerged as the only problem solving mechanism offered to high-school and general chemistry students in contemporary textbooks, replacing more conceptual methods, C-P included.
Cook, Elzbieta; Cook, Robert L. J. Chem. Educ. 2005, 82, 1187.
Learning Theories |
Stoichiometry |
Chemometrics |
Student-Centered Learning
|
Amino Acid Complementarity: A Biochemical Exemplar of Stoichiometry for General and Health Sciences Chemistry Ed Vitz
Calculations demonstrating amino acid complementarity are presented as an interesting application of stoichiometry. Food proteins are said to have complementary amino acids when the proteins combine to provide amino acids in the proper stoichiometric ratios to synthesize human protein. Implications for vegetarian diet, efficiency of food production, and diet adaptations in various cultures are explored briefly.
Vitz, Ed. J. Chem. Educ. 2005, 82, 1013.
Amino Acids |
Proteins / Peptides |
Stoichiometry |
Food Science
|
How Many Digits Should We Use in Formula or Molar Mass Calculations? Christer Svensson
This article addresses the question often asked by students, "How many digits should I use when calculating the formula or molar mass of a substance?
Svensson, Christer. J. Chem. Educ. 2004, 81, 827.
Molecular Properties / Structure |
Learning Theories
|
SI for Chemists: Persistent Problems, Solid Solutions. SI Basic Units: The Kilogram and the Mole Paul J. Karol
The persistent perceived problem with the base units kilogram and mole addressed in those journal articles is resolvable once it is finally recognized that we have been using a double standard: the international platinumiridium kilogram prototype and 12C.
Karol, Paul J. J. Chem. Educ. 2004, 81, 800.
Nomenclature / Units / Symbols |
Quantitative Analysis |
Stoichiometry
|
Chemistry Problem-Solving: Symbol, Macro, Micro, and Process Aspects William R. Robinson
This article summarizes a paper by Yehudit J. Dori and Mira Hameiri, "Multidimensional Analysis System for Quantitative Chemistry Problems: Symbol, Macro, Micro, and Process Aspects", which describes the Multidimensional Analysis System (MAS), an approach to constructing, classifying, and analyzing introductory stoichiometry problems.
Robinson, William R. J. Chem. Educ. 2003, 80, 978.
Kinetic-Molecular Theory |
Stoichiometry
|
Use of Chloroisocyanuarates for Disinfection of Water: Application of Miscellaneous General Chemistry Topics Gabriel Pinto and Brian Rohrig
Using the chlorination of water (using sodium dichloroisocyanurate and trichloroisocyanuric acid) to develop general chemistry concepts; includes question for students and answers.
Pinto, Gabriel; Rohrig, Brian. J. Chem. Educ. 2003, 80, 41.
Stoichiometry |
Water / Water Chemistry |
Applications of Chemistry |
Photochemistry
|
Problem Analysis: Lesson Scripts and Their Potential Applications Maria Oliver-Hoyo
Development and use of lesson scripts to give students more informative feedback when performing calculations in an interactive, computerized tutorial.
Oliver-Hoyo, Maria. J. Chem. Educ. 2001, 78, 1425.
Stoichiometry |
Learning Theories
|
How to Say How Much: Amounts and Stoichiometry Addison Ault
Pictorial representation of the ways by which chemists describe an amount of material, and a systematic way to create a visual representation or "map" for solving stoichiometry problems.
Ault, Addison. J. Chem. Educ. 2001, 78, 1347.
Stoichiometry
|
A Known-to-Unknown Approach to Teach about Empirical and Molecular Formulas P. K. Thamburaj
Analogy for helping students to understand molecular and empirical formula problems.
Thamburaj, P. K. J. Chem. Educ. 2001, 78, 915.
Stoichiometry
|
No, the Molecular Mass of Bromobenzene Is Not 157 amu: An Exercise in Mass Spectrometry and Isotopes for Early General Chemistry Steven M. Schildcrout
Even with no background in bonding and structure, students can successfully interpret the output of a modern research instrument. They learn to identify an isotope pattern, assign chemical formulas to ions giving mass spectral peaks, calculate an average atomic weight (for bromine) from measured isotopic abundances, and write balanced equations for ion fragmentation reactions.
Schildcrout, Steven M. J. Chem. Educ. 2000, 77, 1433.
Isotopes |
Mass Spectrometry |
Atomic Properties / Structure |
Molecular Properties / Structure
|
The Best of Chem 13 News Kathy Thorsen
A variety of suggestions for instructional activities in introductory chemistry from Chem 13 News.
Thorsen, Kathy. J. Chem. Educ. 1998, 75, 1368.
Microscale Lab |
Gases |
Stoichiometry
|
Percent Composition and Empirical Formula - A New View George L. Gilbert
A new method of obtaining the empirical formula for a compound from its percent composition is proposed. The method involves the determination of a minimum molar mass for the compound based on the percentage of each element, obtaining the lowest common molar mass and using this data to calculate the integer values used in writing the empirical formula.
Gilbert, George L. J. Chem. Educ. 1998, 75, 851.
Atomic Properties / Structure |
Stoichiometry |
Chemometrics
|
Constructing Chemical Concepts through a Study of Metals and Metal Ions: Guided Inquiry Experiments for General Chemistry Ram S. Lamba, Shiva Sharma, and Baird W. Lloyd
A set of inquiry-based experiments designed to help students develop an understanding of basic chemical concepts within the framework of studying the properties and reactivity of metals and metal ions.
Lamba, Ram S.; Sharma, Shiva; Lloyd, Baird W. J. Chem. Educ. 1997, 74, 1095.
Electrochemistry |
Metals |
Oxidation / Reduction |
Stoichiometry
|
Those Baffling Subscripts Arthur W. Friedel and David P. Maloney
Study of the difficulties students have in interpreting subscripts correctly and distinguishing atoms from molecules when answering questions and solving problems.
Friedel, Arthur W.; Maloney, David P. J. Chem. Educ. 1995, 72, 899.
Nomenclature / Units / Symbols |
Stoichiometry |
Chemometrics
|
REACT: Exploring Practical Thermodynamic and Equilibrium Calculations Ramette, Richard W.
Description of REACT software to balance complicated equations; determine thermodynamic data for all reactants and products; calculate changes in free energy, enthalpy, and entropy for a reaction; and find equilibrium conditions for the a reaction.
Ramette, Richard W. J. Chem. Educ. 1995, 72, 240.
Stoichiometry |
Equilibrium |
Thermodynamics |
Chemometrics
|
Put the Body to Them! Perkins, Robert R.
Examples of chemistry demonstrations involving student participation, including quantized states and systems, boiling point trends, intermolecular vs. intramolecular changes, polar/nonpolar molecules, enantiomers and diastereomers, and chromatography.
Perkins, Robert R. J. Chem. Educ. 1995, 72, 151.
Chromatography |
Physical Properties |
Phases / Phase Transitions / Diagrams |
Molecular Properties / Structure |
Chirality / Optical Activity |
Quantum Chemistry |
Diastereomers |
Enantiomers
|
Analysis of Cryoscopy Data Wloch, Peter; Cherniak, E. A.
Method for analyzing cryoscopic data with applications to freezing point depression; includes data and analysis.
Wloch, Peter; Cherniak, E. A. J. Chem. Educ. 1995, 72, 59.
Physical Properties |
Physical Properties |
Stoichiometry
|
A Graphical Representation of Limiting Reactant Phillips, J. C.
The concept of limiting reactant may be conveniently illustrated by a graphical representation method that is based on a "minimum slope".
Phillips, J. C. J. Chem. Educ. 1994, 71, 1048.
Stoichiometry
|
Relative atomic mass and the mole: A concrete analogy to help students understand these abstract concepts de Sanabia, Josefina Arce
Suggestions on how to improve student understandings of the mathematical idea of "ratio" to enhance conceptual understanding of this fundamental chemistry concept.
de Sanabia, Josefina Arce J. Chem. Educ. 1993, 70, 233.
Chemometrics |
Stoichiometry
|
A straightforward derivation of stoichiometric mass relationships Gorin, George
An alternative to the factor label method for solving stoichiometric mass relationship problems.
Gorin, George J. Chem. Educ. 1990, 67, 762.
Stoichiometry |
Chemometrics
|
Name for the basic physical quantity n, symbol for relative mass Nelson, P. G.
Recommendations for naming the basic physical quantity n, symbol for relative mass.
Nelson, P. G. J. Chem. Educ. 1990, 67, 628.
Nomenclature / Units / Symbols |
Stoichiometry
|
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
|
Problem solving and requisite knowledge of chemistry Lythcott, Jean
It is possible for students to produce right answers to chemistry problems without really understanding much of the chemistry involved.
Lythcott, Jean J. Chem. Educ. 1990, 67, 248.
Stoichiometry |
Learning Theories
|
A proposition about the quantity of which mole is the SI unit Rocha-Filho, Romeu C.
In this note, after a brief review of the evolution of the meaning of the term mole and a discussion of intrinsic properties of matter, it is proposed that the quantity measured using the SI base unit mole is numerousness, an intrinsic property of samples of matter.
Rocha-Filho, Romeu C. J. Chem. Educ. 1990, 67, 139.
Stoichiometry
|
Hot stellar moles Martin, John S.
To reinforce elemental concepts of chemistry, it helps to see how they work under unusual conditions.
Martin, John S. J. Chem. Educ. 1990, 67, 138.
Stoichiometry
|
Substitution of volumetric for gravimetric methods and other improvements in a new molar volume-molar mass experiment Bedenbaugh, John H.; Bedenbaugh, Angela O.; Heard, Thomas S.
Improvements on an earlier procedure for the quantitative decomposition of 3% hydrogen peroxide to oxygen and water.
Bedenbaugh, John H.; Bedenbaugh, Angela O.; Heard, Thomas S. J. Chem. Educ. 1989, 66, 679.
Gravimetric Analysis |
Enzymes |
Stoichiometry |
Titration / Volumetric Analysis
|
The unit gram/mole and its use in the description of molar mass Gorin, G.
How is molar mass related to the quantity called "molecular (or atomic) weight"?
Gorin, G. J. Chem. Educ. 1984, 61, 1045.
Nomenclature / Units / Symbols |
Stoichiometry
|
Bicarbonate in Alka-Seltzer: A general chemistry experiment Peck, Larry; Irgolic, Kurt; O'Connor, Rod
Determining the percentage bicarbonate ion by mass in Alka-Seltzer.
Peck, Larry; Irgolic, Kurt; O'Connor, Rod J. Chem. Educ. 1980, 57, 517.
Quantitative Analysis |
Gases |
Stoichiometry |
Acids / Bases
|
|
