Discusses the use of a computer program to describe chemical reactions by the concepts of reaction coordinate and energy profile. Indicates that representation of a collision encounter by a trajectory on the energy surface leads to a precise explanation, rather than schematic, in the teaching chemical kinetics. (CC)

Reviewed are two computer software programs for Apple II computers on weather for upper elementary and middle school grades. "Weather" introduces the major factors (temperature, humidity, wind, and air pressure) affecting weather. "How Weather Works" uses simulation and auto-tutorial formats on sun, wind, fronts, clouds, and…

Describes a "tracing the sun" worksheet combining models with computer programs and classroom discussion. Provides the worksheet including the nine steps of the activity and several discussion questions. (YP)