Presented is an experiment which provides a study both of the end correction involved with open pipes and also of the effect that varying the size of the tone hole in the pipe has on its fundamental frequency. Discussed are equipment, formulas, background, and methods. (CW)

Discusses the missing water on Mars. Describes five experiments simulating conditions on Mars: (1) behavior of dry ice; (2) low-pressure vacuum; (3) freezing point depression; (4) water in hydrated minerals and clay; and (5) properties of carbon dioxide. (YP)

Discusses simple analysis of urine in the classroom. Describes the materials and procedures for the analysis. Provides a laboratory report giving characteristics of: (1) odor, color, and clarity; (2) specific gravity; (3) sediment; (4) test strips; and (5) albumin and phosphates. (YP)

Discusses an organic laboratory program emphasizing individual experiments for the second semester of a two-semester course. Describes the outlines of two topics, including halide or alcohol synthesis and multistep synthesis. Provides reaction tables of alcohols and halides. (YP)

Presents two demonstrations: heatwave focusing by concave reflectors and wave speed on a string. Describes the apparatus, and procedures for the demonstrations. (YP)

Introduces a method for two-dimensional kinematics measurements by hanging marbles with long strings. Describes experimental procedures for conservation of momentum and obtaining the coefficient of restitution. Provides diagrams and mathematical expressions for the activities. (YP)

Describes an apparatus that facilitates the quantitative study of fermentation in yeast by allowing simultaneous measurements of fermentation rates in several treatments and a control. Explains a laboratory procedure in which the apparatus is used. Several suggestions for further investigations are included. (Author/RT)

Demonstrates the inverted image, the chromatic aberration, and the floaters of the eye using an opaque 35mm film container with a small pinhole poked through the bottom. Describes the observation of Haidinger's brushes using polarized light. (YP)

Discusses a demonstration of interference phenomena using three sheets of polaroid material, a light source, and a light meter. Describes instructional procedures with mathematical expressions and a diagram. (YP)

Describes an air track experiment demonstrating the transfer of mechanical energy from elastic potential to kinetic. Discusses four methods for calculating energy stored in the spring. Included are pictures, typical data, and graphs. (YP)

Provided are two demonstrations for an introductory course in chemistry. The first one emphasizes the observation and the interpretation of facts to form hypotheses during the heating of a beaker of water. The second demonstration shows the liquid phase of carbon dioxide using dry ice and a pressure gauge. (YP)

Describes 10 experiments for characterizing the chromium complex Reinecke's Salt. The properties of the complex, experimental procedures, and a discussion are provided. Analyses are presented for chromium, total ammonia, thiocyanate, ammonium ion, and hydrate water. Measurement methods are described. (YP)

Outlined are materials and testing procedures in which various plant species are screened to determine if they are producing antibiotics. Diagrams are included. (RT)

Describes an experiment in which a simple laser-based apparatus is used for measuring the change in refractive index during the acid-catalyzed hydrolysis of glycidol into glycerine. Gives a schematic of the experimental setup and discusses the kinetic analysis. (MVL)

Discusses an enzyme kinetics laboratory experiment involving a two substrate system for undergraduate biochemistry. Uses the enzyme gamma-glutamyl transpeptidase as this enzyme in blood serum is of clinical significance. Notes elevated levels are seen in liver disease, alcoholism, and epilepsy. Uses a spectrophotometer for the analysis. (MVL)