Describes several sources of error in a sampling and analysis procedure for oxides of nitrogen from stationary sources (Method 7, Federal Register, 1971), and provides methods for resolving these errors. (JR)

Reports a study of difficulties encountered by 14.5- to 15.0- year-old children in learning the mole concept with a programed instruction. Concludes that three respective disturbing factors were embedded in manipulation of molarity of solutions, balancing equations, and misapprehension that one mole of a compound always reacts with one mole of…

Discusses the controversy about the discovery of element 72, involving Urbain's isolation of celtium, Dauvillier's reexamination of celtium samples, and Coster and Hevesy's announcement of the existence of hafnium. Indicates that the Copenhagen workers are finally accredited for the element discovery in their x-ray spectral studies. (CC)

Discusses current financial problems encountered in chemistry and chemical engineering departments, including declining federal support of fellowships and equipment purchases and increasing enrollment in first and second year chemistry. Predicts that the problem of replacing obsolete and worn out equipment will become most acute in the future. (CC)

Reviews current research interests in photographic chemistry, involving two proposed models for spectral sensitization of crystal defects and impurities in the photolysis reactivity and the mechanisms of development and complexation. Establishment of photographic chemistry in a chemistry curriculum is recommended. (CC)

Contained are five questions related to chemistry and ecology. Satisfactory answers to these five questions are included. (RH)

Described is a cooperative undergraduate program in chemistry between two small church-related colleges in Tennessee. (RH)

Discusses roles played by inelastic molecular collisions in gas molecular theories and suggests the inclusion of inelastic aspects in the freshman chemistry course. (CC)