Considers carbon-carbon multiple bonds in terms of Pauling's bent bond model, which allows direct calculation of double and triple bonds from the length of a CC single bond. Lengths of these multiple bonds are estimated from direct measurements on "bent-bond" models constructed of plastic tubing and standard kits. (CS)

Provides procedures appropriate for a high school chemistry class that demonstrate the Arrhenius law by determining the heat of vaporization of a volatile liquid. (CS)

Presents a brief overview of the important processes and techniques used industrially for forming thin films. (HM)

Traces the historical development of processing information for the blind from the system devised by Barbier to present systems of producing Braille documents using computers. Cites the impact of microprocessors and outlines possibilities for Braille reproductions in the future. (GS)

Provides specific information about the eruption of Mt. St. Helens in March 1980. Also discusses how volcanoes are formed and how they are monitored. Words associated with volcanoes are listed and defined. (CS)

This article describes the establishment of a preschool resource center for rural families, some activities which have taken place, some problems which have been encountered, and some resource utilization data. Other topics discussed include materials, community involvement, and parent activities. (DB)

This article presents results of a study to determine the role of the public library in serving young children. Recommendations from early childhood educators were obtained, and data were utilized to develop guidelines for public libraries. (Author/DB)

Outlines a variety of laboratory procedures, discussions, and demonstrations including Brownian motion, a synchronous motor, jet engine, atmospheric pressure vortex ring machines, solid chemical dispensing, testing household detergents, wallchart storage, pollution by industrial chemicals, an optical illusion, and buoyancy. (GS)

Reviews the developments in the electrical sciences that occurred during the first half of the eighteenth century. Emphasizes the roles of the electric machine and the capacitor. (GS)

Discusses several areas to be considered in designing a faculty development program in the physical sciences, including needs, types of programs, instructional development, and personal and professional development. (CS)

Lists equipment and materials needed and procedures for analyzing soil, in which secondary school students experience practical applications to acid-base reactions, pH, oxidation-reduction, precipitation and solubility. (CS)

Presents techniques to utilize student organization information and materials in shorthand and transcription instruction. (MF)

This article shows that, by applying the Hellman-Feynman theorem alone to screened Coulomb potentials, the first four coefficients in the energy series in powers of the perturbation parameter can be obtained from the unperturbed Coulomb system. (Author/HM)

Discusses the nature of the impurity modes in a monatomic chain employing a molecular mode. This approach brings out clearly the characteristics of the inband, localized, and resonant modes of substitutions impurities in crystals. (Author/HM)

Provides short descriptions of computer application in chemistry including displaying organic molecules, solving stoichiometry problems, developing laboratory schedules, programing periodic chart information on pocket calculators, editing chemical manuscripts, instruction in Lewis Structures of simple molecules, a kinetic simulation system, and…