Describes a reaction rate experiment in which the manipulative skills needed are minimal and the measure of reaction rate is direct and understandable. (Author/GS)

Presented are activities relating science and Halloween. (PB)

Describes a theory concerning the formation of soap films which enables this technique to be applied to problems requiring the minimization of the surface area between fixed boundaries. (Author/CP)

Describes an undergraduate physical chemistry experiment in which the acid catalyzed hydrolysis of sucrose is used to determine the catalytic coefficient of the hydronium ion, the catalyst in this reaction. (MLH)

Discusses difficulties encountered in the determination of the thermal conductivity of a gas. Provides analyses of one particular set of data. (CP)

Describes the construction of a circuit which directly measures current in a coil of superconducting wire. (CP)

Photographs of snow covered buildings are used to illustrate thermal radiation from various types of structures and the effect of insulation on heat loss. (CP)

Details construction of an inexpensive electronic auditory device in which the resistance in parallel with the device is inversely proportional to the frequency of sound produced. (CP)

Describes an activity involving a transparent water filled box and a plane mirror in which the refraction of light rays is demonstrated. (CP)

Investigates quantitatively the diffractions of light by a U.S. penny and an aperture of the same size. Differences noted between the theory and measurements are discussed, with probable causes indicated. (Author/CP)

Advocates wildflower collecting as a class project, citing instances of interest in studies of soil composition, growing wildflowers, and increased student motivation toward the subject of botany as basis for the activity. (CP)

Describes a high school botany course in which the students must collect plant specimens, prepare herbarium cards and identify the specimens. (LS)

Presents a science problem, involving the inhalation of hydrogen cyanide, that is used as an extra credit acitvity for chemistry students. (GS)

Explains why sucrose does not reduce Fehling's or Benedict's solution while maltose, fructose and glucose do. (LS)