Reviews the characteristics, reactions, importance, and commercial applications of block and graft copolymers. (JN)

Molecular mechanics is a nonquantum mechanical method for solving problems concerning molecular geometries and energy. Methodology based on: the principle of combining potential energy functions of all structural features of a particular molecule into a total force field; derivation of basic equations; and use of available computer programs is…

Discusses the role that radiation-chemical techniques play in the study of the electron transfer process. (CS)

Discusses the possibilities and the potentials of advancing the state of the art in computer chemistry. Explains that the fears will be extrapolating new compounds from existing ones, and predicting new activities based on chemical structure. (GA)

Demonstrates that the Schrodinger equation for the hydrogenlike atom separates in both spheroconal and prolate spheroidal coordinates and that these separations provide a sound theoretical basis for the real and hybrid atomic orbitals. (Author/SK)

Described is a method of utilizing the standard ball and stick models, used in demonstrating molecular structure, for building two electron bonding components. Included is the construction of several molecules with word and picture descriptions. (Author/DS)

Discussed is the classical partition function for the ideal gas and how it differs from the exact value for bosons or fermions in the classical regime. The differences in the two values are negligible hence the classical treatment leads in the end to correct answers for all observables. (Author/DS)

Details a procedure for accurately calculating the quantum mechanical energies of hydrocarbons using the perturbational molecular orbital (PMO) method, which does not require the use of a computer. (BT)

Experimental and theoretical data are presented which verifies the existence of the hydronium ion. This existence was confirmed directly by x-ray and neutron diffraction in hydrochloric acid. Recommended is the abandonment of the erroneous hydrogen ion formulation and names such as proton hydrate. (BT)

Discusses Bohr's atomic theory from a chemical, rather than a physical, standpoint. (MLH)

Describes a graduate quantum mechanics projects in which students write a computer program that performs ab initio calculations on the electronic structure of a simple molecule. Theoretical potential energy curves are produced. (MLH)

Described is the basic biology involved in mapping chromosomes as presented at a symposium at a recent meeting of the American Chemical Association which focused on the Human Genome Initiative. Different types of gene maps and techniques used to produce gene maps are discussed. (CW)

The story of researcher Joseph V. Smith's solution to the chemical structure of a zeolite known as boggsite is presented. The value of the solution and the use of boggsite are discussed. (CW)

Discussed is the performance of college students on the task of solving chemistry problems involving Lewis structures. Difficulty of the task and of individual problems is described. A taxonomy of skills associated with Lewis structures is presented. (CW)

Addresses solution nonmetal determinations on a fundamental level. Characterizes research in this area of chemical instrumentation. Discusses the fundamental limitations of nonmetal atomic spectrometry, the status of nonmetals and atomic spectroscopic techniques, and current directions in solution nonmetal determinations. (CW)