| Journal Articles: 29 results |
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Using Pooled Data and Data Visualization To Introduce Statistical Concepts in the General Chemistry Laboratory Robert J. Olsen
This article describes how data pooling and visualization can be employed in the first-semester general chemistry laboratory to introduce core statistical concepts such as central tendency and dispersion of a data set.
Olsen, Robert J. J. Chem. Educ. 2008, 85, 544.
Chemometrics |
Stoichiometry
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Interactive Demonstrations for Mole Ratios and Limiting Reagents Crystal Wood and Bryan Breyfogle
The objective of this study was to develop interactive lecture demonstrations based on conceptual-change learning theory. Experimental instruction was designed for an introductory chemistry course for nonmajors to address misconceptions related to mole ratios and limiting reagents
Wood, Crystal; Breyfogle, Bryan. J. Chem. Educ. 2006, 83, 741.
Learning Theories |
Reactions |
Stoichiometry |
Student-Centered Learning
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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
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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
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Empirical Formulas and the Solid State: A Proposal William B. Jensen
This brief article calls attention to the failure of most introductory textbooks to point out explicitly the fact that nonmolecular solids do not have molecular formulas and suggests some practical remedies for improving textbook coverage of this subject. The inadequacies of the terms "empirical formula" and "molecular formula" are also discussed, and the terms "relative compositional formula" and "absolute compositional formula" are proposed as more appropriate alternatives.
Jensen, William B. J. Chem. Educ. 2004, 81, 1772.
Solid State Chemistry |
Solids |
Stoichiometry |
Nomenclature / Units / Symbols
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The Origin of Stoichiometry Problems William B. Jensen
In response to a reader query, the column discusses the question of when quantitative stoichiometry problems first began to appear in introductory textbooks, and especially the role of the American chemist, Josiah Parsons Cooke, in this process.
Jensen, William B. J. Chem. Educ. 2003, 80, 1248.
Stoichiometry
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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
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A Concept-Based Environmental Project for the First-Year Laboratory: Remediation of Barium-Contaminated Soil by In Situ Immobilization Heather D. Harle, Phyllis A. Leber, Kenneth R. Hess, and Claude H. Yoder
Simulating the detection and remediation of lead-contaminated soil using barium.
Harle, Heather D.; Leber, Phyllis A.; Hess, Kenneth R.; Yoder, Claude H. J. Chem. Educ. 2003, 80, 561.
Synthesis |
Stoichiometry |
Precipitation / Solubility |
Qualitative Analysis |
Quantitative Analysis |
Metals |
Aqueous Solution Chemistry |
Gravimetric Analysis |
Applications of Chemistry
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The Strange Case of Mole Airlines Flight 1023 Karl F. Jones
Forensic chemistry mystery / puzzle involving determining formulas based on chemical compositions.
Jones, Karl F. J. Chem. Educ. 2003, 80, 407.
Drugs / Pharmaceuticals |
Stoichiometry |
Molecular Properties / Structure |
Enrichment / Review Materials |
Applications of Chemistry |
Forensic Chemistry
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Determination of the Empirical Formula of a Copper Oxide Salt Using Two Different Methods Michael J. Sanger and Kimberly Geer
Converting copper oxide into copper metal using two different methods: reduction of copper oxide to copper metal using methane gas, and reduction of copper oxide to copper metal using aluminum in aqueous solution; the results are used to determine the empirical formula of copper oxide.
Sanger, Michael J.; Geer, Kimberly. J. Chem. Educ. 2002, 79, 994.
Oxidation / Reduction |
Stoichiometry |
Oxidation / Reduction |
Aqueous Solution Chemistry |
Metals
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Making Assumptions Explicit: How the Law of Conservation of Matter Can Explain Empirical Formula Problems Stephen DeMeo
How the law of conservation of mass provides a theoretical foundation for empirical formula problems that introductory students encounter.
DeMeo, Stephen. J. Chem. Educ. 2001, 78, 1050.
Descriptive Chemistry |
Stoichiometry
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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
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The Synthesis and Analysis of Copper(I) Iodide. A First-Year Laboratory Project Lara A. Margolis, Richard W. Schaeffer, and Claude H. Yoder
This project provides a convenient preparation of a compound whose identity will not be obvious to students. The analytical procedures illustrate the fundamentals of gravimetric analysis and some basic chemical and physical characteristics of the elements. The analytical data allow students to find the identity of the product by determining its empirical formula.
Margolis, Lara A.; Schaeffer, Richard W.; Yoder, Claude H. J. Chem. Educ. 2001, 78, 235.
Synthesis |
Oxidation / Reduction |
Stoichiometry |
Gravimetric Analysis |
Qualitative Analysis |
Stoichiometry
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Preparation and Properties of an Aqueous Ferrofluid Patricia Enzel, Nicholas B. Adelman, Katie J. Beckman, Dean J. Campbell, Arthur B. Ellis, and George C. Lisensky
This paper describes a simple synthesis of an aqueous-based ferrofluid that may be used in an introductory science or engineering laboratory. This paper also describes a method for repelling both oil- and water-based ferrofluid from solid surfaces that would otherwise be stained by the fluid. Finally, a demonstration of the interaction between ferrofluid and magnetic fields, in which ferrofluid is induced to leap upward by a stack of magnets, is described.
Enzel, Patricia; Adelman, Nicholas B.; Beckman, Katie J.; Campbell, Dean J.; Ellis, Arthur B.; Lisensky, George C. J. Chem. Educ. 1999, 76, 943.
Materials Science |
Magnetic Properties |
Nanotechnology |
Stoichiometry |
Colloids
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CHEMiCALC (4000161) and CHEMiCALC Personal Tutor (4001108), Version 4.0 (by O. Bertrand Ramsay) Scott White and George Bodner
CHEMiCALC is a thoughtfully designed software package developed for use by high school and general chemistry students, who will benefit from the personal tutor mode that helps to guide them through unit conversion, empirical formula, molecular weight, reaction stoichiometry, and solution stoichiometry calculations.
White, Scott; Bodner, George M. J. Chem. Educ. 1999, 76, 34.
Chemometrics |
Nomenclature / Units / Symbols |
Stoichiometry
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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
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CheMentor Software System by H. A. Peoples reviewed by Brian P. Reid
CheMentor is a series of software packages for introductory-level chemistry, which includes Practice Items (I), Stoichiometry (I), Calculating Chemical Formulae, and the CheMentor Toolkit.
Reid, Brian P. J. Chem. Educ. 1997, 74, 1047.
Stoichiometry
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Pictorial analogies VIII: Types of formulas and structural isomers Fortman, John J.
Visual ways of understanding empirical, structural, and molecular formulas as well as structural isomers.
Fortman, John J. J. Chem. Educ. 1993, 70, 755.
Stoichiometry |
Diastereomers
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Empirical formulas from atom ratios: A simple method to obtain the integer factors of a rational number Weltin, E.
Most textbooks advise students to use a method tantamount to trial and error when they encounter a ratio in empirical formula calculations where it is not immediately apparent what the coefficients should be. The author describes a simple procedure that is an effective way to find the integer factors.
Weltin, E. J. Chem. Educ. 1993, 70, 280.
Stoichiometry |
Chemometrics
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Gas chamber stoichiometry Hunter, Norman W.; Wilkins, Curtis C.; Pearson, Earl F.
Most students know that HCN is used in gas chambers, they may not know however that HCN is produced in the burning of carpets, draperies, clothing and other textiles made of polyacrylonitrile.
Hunter, Norman W.; Wilkins, Curtis C.; Pearson, Earl F. J. Chem. Educ. 1992, 69, 389.
Stoichiometry |
Gases |
Applications of Chemistry
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A simple rhyme for a simple formula Thompson, Joel S.
A poem that helps students remember how to solve empirical formulas.
Thompson, Joel S. J. Chem. Educ. 1988, 65, 704.
Stoichiometry
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Reaction stoichiometry and suitable "coordinate systems" Tykodi, R. J.
Methods for dealing with problems involving reactions stoichiometry: unitize and scale up, factor-label procedure, de Donder ratios, and titration relations.
Tykodi, R. J. J. Chem. Educ. 1987, 64, 958.
Stoichiometry |
Titration / Volumetric Analysis |
Chemometrics
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An addendum to: A simultaneous analysis problem for advanced general chemistry laboratories Gallaher, T. N.; Moody, F. P.; Burkholder, T. R.; Leary, J. J.
A modification made to the determination of the empirical formula of MgO by burning magnesium metal in air.
Gallaher, T. N.; Moody, F. P.; Burkholder, T. R.; Leary, J. J. J. Chem. Educ. 1985, 62, 626.
Stoichiometry
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Composition of gas hydrates. New answers to an old problem Cady, George H.
The author provides a discussion on nonstoichiometric crystalline solids as they deserve attention in elementary chemistry courses because they are interesting and increasingly important. Laboratory activities are included.
Cady, George H. J. Chem. Educ. 1983, 60, 915.
Stoichiometry |
Solids |
Crystals / Crystallography
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Simplest formula of copper iodide: a stoichiometry experiment MacDonald, D. J.
It is difficult to find a chemistry experiment that convincingly demonstrates stoichiometric relationships. The experiment in this article is elegant and pedagogically effective.
MacDonald, D. J. J. Chem. Educ. 1983, 60, 147.
Stoichiometry
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The chemical formula. Part I: Development Kolb, Doris
The origin of the chemical formula, the problem of isomers, nucleus theory, radical theories, residue theory, type theory, extension of the type theory, valence theory, graphic formulas, and contribution of Cannizzaro.
Kolb, Doris J. Chem. Educ. 1978, 55, 44.
Stoichiometry
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A logic diagram for teaching stoichiometry Tyndall, John R.
Presents a diagram that the author found helpful in teaching the fundamentals of stoichiometry.
Tyndall, John R. J. Chem. Educ. 1975, 52, 492.
Stoichiometry |
Chemometrics
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Application of diophantine equations to problems in chemistry Crocker, Roger
The mathematical method of diophantine equations is shown to apply to two problems in chemistry: the balancing of chemical equations, and determining the molecular formula of a compound.
Crocker, Roger J. Chem. Educ. 1968, 45, 731.
Mathematics / Symbolic Mathematics |
Stoichiometry
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Minimum molecular weight approach for determining empirical formulas Harwood, H. James
Describes the determination of empirical formulas from "minimum molecular weight," the molecular weight divided by the number of atoms of an element present in a molecule.
Harwood, H. James J. Chem. Educ. 1965, 42, 222.
Molecular Properties / Structure |
Stoichiometry
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