Investigated was the level of cognitive development of Afro-American students enrolled in general chemistry courses to determine the strategies used by both successful and unsuccessful problem solvers in solving stoichiometry problems. Results indicated that a higher level of cognitive development may be crucial in solving more sophisticated…

Discussed is an analytical technique that uses photons from lasers to resonantly excite an electron from some initial state of a gaseous atom through various excited states of the atom or molecule. Described are the apparatus, some analytical applications, and the precision and accuracy of the technique. Lists 26 references. (CW)

Described is an activity which uses a 96-well reaction plate and soda straws to construct a model of the periodic table of the elements. The model illustrates the ionization energies of the various elements. Construction of the model and related concepts are discussed. (CW)

Described is a simple test tube method developed lead analysis of samples of roadside soil. The relationship between the results and the traffic flow indicate car exhausts are the major source of lead pollution. Materials and procedures are detailed. An example of results is provided. (Author/CW)

Devised is a test involving chemical examples to establish to what extent college chemistry students recognized and assessed the explanatory content of statements presented in the form of justifications. Several results are discussed. Several test items are included. (Author/YP)

Presented is a brief history of manufacturing chocolate and an outline of production methods. Describes laboratory techniques used to monitor liquid chocolate viscosity. Discusses a simple experiment which can be performed in the classroom. (Author/CW)

Discusses teaching the names, symbols, and charges of 53 common ions along with those of the elements. Provides an ion quiz sheet. (YP)

Discussed are the molecular electronic terms which can arise from a given electronic configuration. Considered are simple cases, molecular states, direct products, closed shells, and open shells. Two examples are provided. (CW)

Presented are system concepts with examples of various vendor approaches for implementing laboratory local area networks. (CW)

Establishes a theoretical basis for both understanding and testing the molecular level assumptions in mixtures. Considers activity coefficient models and equation of state mixing rules. (YP)

Described are analytical applications of the theory of random processes, in particular solutions obtained by using statistical procedures known as Monte Carlo techniques. Supercomputer simulations, sampling, integration, ensemble, annealing, and explicit simulation are discussed. (CW)

Presented is a laboratory exercise designed to demonstrate the effects of moisture on hay preservation products in a manner that does not require large amounts of equipment or instructor time. Materials, procedures, and probable results are discussed. (CW)

Described is a course designed to better prepare students for employment in chemical industries. A course schedule for this interim course and a list of sources of speakers and speaker credentials is provided. (CW)

Discussed are accidents that occur in the laboratories of highly trained chemists. Four examples are provided to illustrate potential hazards that are often overlooked in chemistry laboratories, molten inorganic salt baths, the reaction of acetone and hydrogen peroxide, halogenated acetylene compounds, and the reaction of hydrogen peroxide and…

Discussed are applications of robotics in the chemistry laboratory. Highlighted are issues of precision, accuracy, and system integration. Emphasized are the potential benefits of the use of robots to automate laboratory procedures. (CW)