Presents demonstrations concerning the thermodynamic properties of rubber elasticity and simultaneous reactions of acetone. (MLH)

Describes demonstrations of the ring strain inherent in cyclopropanes and cyclobutanes and their resultant high reactivity, and selective solubility principles. (MLH)

Presents two demonstrations; one on Boyle's Law, to illustrate the gas law and serve as a challenging problem for the students; the other is a modified Color Blind Traffic Light demonstration in which the oscillating reactions were speeded up. (GA)

Describes the use of various indicators to demonstrate chemical reactions; the display of sodium as a shiny metal; and the illustration of the attainment of chemical equilibrium with beakers of chemicals and an overhead projector. (MLH)

Lecture-demonstrations are presented on the topics of measurement errors and formation and dissolution of precipitates. (BB)

Provides demonstrations using digital display instruments of some of the mass and pH-related topics covered in first-year chemistry courses. (CP)

Three demonstrations are described: (1) a variation of the iodine clock reaction in which a cassette tape recording of the William Tell Overture accompanies color changes as solutions are mixed; (2) a crystallization demonstration using sodium acetate; and (3) lecture-demonstrations creating colored colloidal dispersions from clear solutions. (CS)

Described is a demonstration in which the reaction sequence can be easily followed since the reactant, intermediates, and the final product have intense and different colors. Materials and procedures for this demonstration are discussed. (CW)

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)