Describes the use of balloon models to illustrate chemical bonding in atoms. (BR)

A new system for the experiments on intermolecular forces is presented in the interest of laboratory safety. (GS)

Describes how beekeeping became a class project and the educational benefits of the project. Also describes how to prepare a group to maintain its own hive and suggests resource materials. (BR)

Presents directions for an activity designed to illustrate the function of plant nutrients. (PEB)

Describes some uses of pocket-size electronic calculators in biology classes; for example, charting exponential population curves, evolution by natural selection, and random genetic drift. (PEB)

Describes a chemiluminescence system which can be used to demonstrate the effects of certain factors which affect the rate of reaction (temperature, concentration, catalysis, solvent, etc.), and to perform experiments relevant to the mechanism of the system. (SLH)

Describes a technique which enables the student to observe the relativistic behavior of electrons in a gamma ray detector and compare his results with the classical and relativistic predictions. Shows that it is possible to unambiguously determine the electron's momentum by knowing the Compton edge and photopeak energies of a gamma ray energy…