Describes three demonstrations/activities that involve forces: (1) a canoe-like boat made from copper window screen; (2) magnetic forces with a paper clip and ceramic magnetic; and (3) an "icemobile" machine that cuts ice cubes without an obvious source of energy. (DH)

Reviews computer programs for simulating experiments on (1) polymer sequencing; (2) genetic codes; and (3) cloning. Reasons for using such software are provided. (DH)

Describes how color graphics are built up on microcomputer displays and how a range of colors can be produced. Discusses the logic of color formation, noting that adding/subtracting color can be conveniently demonstrated. Color generating techniques in physics (resistor color coding and continuous spectrum production) are given with program…

Describes: the chemical history of a pencil; a simple solar camera for measuring the sun's diameter; the experimental comparison of the thermal stability of metal carbonates; and the introduction of the concept of weight as a force to young children. A computer program listing on color mixing is also provided. (JN)

Discusses how "live" experiments were combined with media packages and recorded lectures to allow coverage of more material and foster greater student/teacher interactions. Notes were distributed at the beginning of the semester which allow students to record experimental data from class demonstrations. Problems and suggestions for course…

CHEMPAC, a computer-based chemistry course developed for high school students, bridges the gap between textbook and laboratory to provide greater quantitative accuracy to laboratory experiments. This course and experiments (involving pH) illustrating the CHEMPAC approach are provided. (JN)

Describes an undergraduate organic chemistry experiment designed to illustrate the power of nuclear magnetic reasonance spectroscopy in a determination of the configurations at centers of chirality of various isomers of acyclic systems. Provides a background discussion and experimental procedure. (JM)

Describes an experiment designed to teach students to apply the same statistical awareness to instrumentation they commonly apply to classical techniques. Uses propagation of error techniques to pinpoint instrumental limitations and breakdowns and to demonstrate capabilities and limitations of volumetric and gravimetric methods. Provides lists of…

Reviews courseware (Apple II) providing laboratory simulations in atomic physics. Although material is not user-friendly and requires some background, the animations are good representations of electron mass, Thompson e/m, Millikan oil-drop, and mass spectrometer. Recommended for classroom demonstration purposes at high school or introductory…

This introduction to photoelectrochemical (PEC) cells reviews topics pertaining to solar energy conversion and demonstrates the ease with which a working PEC cell can be prepared with n-type silicon as the photoanode and a platinum counter electrode (both immersed in ethanolic ferrocene/ferricenium solutions). Experiments using the cell are…

Discusses use of microcomputers for grading, simulating laboratory experiments, data collection, and for communicating with students. Database systems, word processing, and an electronic spreadsheet program are also considered. Programing tips for several of these areas are included. (JN)

Describes an experiment for plotting equipotential curves in which the normally used electrometer is replaced by a null-deflecting potentiometer, and in which the uniform resistance wire is substituted by carbon-impregnated conductive paper. Procedures and sample plot/results (including graphic analysis) are provided. (JM)

A laboratory study is detailed utilizing the skills of hypothesizing, designing experiments, and controlling variables. (EB)

Two experiments investigated the accuracy of naive observers' judgments of behavior change. Observers accurately and reliably detected the change in subjects' behavior across time; the provision of a diagnostic label did not affect the accuracy of the observations. Implications of these findings for the assessment of counseling outcome are…

Described is the construction of a density gradient column and several density related experiments which can be performed with the device. (SL)