Describes a simple redox reaction that occurs between potassium permanganate and oxalic acid that can be used to prepare an interesting disappearing ink for demonstrating kinetics for introductory chemistry. Discusses laboratory procedures and factors that influence disappearance times. (CW)

Reviews a method for determining oxidation numbers in covalent compounds and balancing mixed organic-inorganic or purely organic systems. Points out ambiguities presented when adjacent atoms have small or zero electronegativity differences. Presents other limitations that arise when using electronegativity values. (CW)

Explores the applicability of Mulliken's united atom model to a variety of chemical systems and demonstrates its value as a teaching tool. Considers applications to first row hydrides, compounds of the first and second periods, heavy atoms, and cluster systems. (MVL)

Describes a project to determine the impact of weekly quizzing on student performance in general chemistry. Notes final exam scores were the same for students who took weekly quizzes as for students who took the quizzes but not for credit. Explores several possible explanations. (MVL)

Shows how video recordings of the Brownian motion of tiny particles may be made. Describes a classroom demonstration and cites a reported experiment designed to show the random nature of Brownian motion. Suggests a student experiment to discover the distance a tiny particle travels as a function of time. (MVL)

Reports an experimental procedure for studying Einstein's theory of Brownian movement using commercially available latex microspheres and a video camera. Describes how students can monitor sphere motions and determine Avogadro's number. Uses a black and white video camera, microscope, and TV. (ML)

Presents examples of chemical education research that illustrate changes in focus, method, and direction over the past 50 years. Contains more than 50 references. (WRM)

Describes a Pascal-language based kinetics rate package for the microcomputer. Considers possible ecological uses for the program and illustrates results for several rate laws. Discusses hardware and software needs for adequate operation. (ML)

Describes five computer software packages; four for MS-DOS Systems and one for Apple II. Included are SPEC20, an interactive simulation of a Bausch and Lomb Spectronic-20; a database for laboratory chemicals and programs for visualizing Boltzmann-like distributions, orbital plot for the hydrogen atom and molecular orbital theory. (CW)

Analyzes an old chemistry examination that was given to a college chemistry class in 1984. Contrasts several of the examination's features against most modern ones. Notes the emphasis on observable properties and the practical applications of substances. Argues that the newer examinations may stress too much theory and don't stress communication…

Proposes that higher education insist more on the education of its chemists and less on strictly instrument training. Lists several instances where education may have been more useful than the strict training military officers received. Discusses the role of chemists in society. (MVL)

Investigates ground state electron configurations for some common elements using graphical methods. Bases observed tendencies on following ideas: "occupancy of differing shells, occupancy of differing subshells within a given shell, double occupancy vs. single occupancy of an orbital, and quantum-mechanical exchange." (ML)

Follows the development of a course in nuclear and radiochemistry at Penn State. Lists specific nuclear science topics covered in the undergraduate level course. Describes audio-visual materials that have been developed for the course and includes a survey of students taking the course. (ML)

Develops a taxonomy of styles for teaching general chemistry laboratory courses. Differentiates between expository instruction, inquiry instruction, discovery instruction, and problem-based instruction in the laboratory. Reviews research on the effectiveness of the various types of instruction. Contains 68 references. (WRM)

Describes an instructional strategy based on the learning cycle for teaching the use of significant figures. Provides explanations of teaching activities for each phase of the learning cycle (exploration, invention, application). Compares this approach to teaching significant figures with the traditional textbook approach. (TW)