Describes a teaching model that consists of a plywood box containing mechanisms that instruct the student about the technical aspects of an infrared spectrophotometer and how a spectrum is generated. (MLH)

Explores the applicability of Mulliken's united atom model to a variety of chemical systems and demonstrates its value as a teaching tool. Considers applications to first row hydrides, compounds of the first and second periods, heavy atoms, and cluster systems. (MVL)

Discusses the least squares technique and states the difficulty in finding suitable examples for using it in the chemical laboratory. Provides several least squares equations and the accompanying three dimensional drawings. Notes graphic lecture aids are available from the author as either slides or overheads. (MVL)