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)

Describes a study designed to compare the gradual development of children's understanding of shadows with Piaget's stages, categorize pupil responses in the shadow tasks, identify typical pupil responses in each category, and enumerate curriculum implications from the investigation. (GS)

Explores the meaning which children attach to time. Offers possible definitions of time and questions the reliability and validity of the standard unit of time as used in school laboratories. (GS)

Discusses the Weinberg-Salam theory of the weak and electromagnetic interactions which is an attempt at a partially unified theory for physics. (HM)

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)

Describes a method to determine the thermal diffusivity of a polymer, which is suitable for the undergraduate laboratory. It serves as a practical demonstration of classical Fourier theory. (Author/HM)

This is part III of an explanation of the influence and development of quantum mechanical ideas as applied to inorganic complexes. (Author/SA)

The effects of human activity on stratospheric zone and several consequences to humans and their environment are discussed. (Author/SA)

Presents a brief discussion of rules for consistent chemical equations writing, intended for college chemistry students and instructors. (HM)

Describes a scheme for teaching physics in secondary schools. Included is a brief description of the scheme as it was tested in a Yugoslavian secondary school. (SA)

Describes a methodology utilized to teach 61 concrete operational ninth grade students the formal operational ideas of density and relative density. Analysis of the success of the teaching method indicated 25 students finished with a full understanding of density, 26 gained some understanding, and 10 gained little or no understanding. (SL)

Examines how children's misconceptions regarding scientific phenomena change over time through instruction and other mechanisms. Asserts that Piagetian and Vygotskian theories offer insights into children's misconceptions related to how they are formed and how they are influenced by personal experience and social factors, and that these theories…

Argues that the greatest barrier to science education is overcoming students' naive conceptions of science. Recommends helping students to maintain a sense of dissatisfaction with their archaic notions of the nature of science, essentially a philosophical sense of the difficulty of the problems involved. (SM)