Introduces a procedure for a whole class of experiments which require very simple and inexpensive equipment and which illustrate one of the basic problems of chemical reaction engineering. The reactions are designed to allow development of a kinetic rate equation from laboratory data. (JM)

Provides materials needed and procedures to illustrate the reversible color changes in certain organic acids on bases due to changes in pH. The technique employs three indicators which are colorless in acidic solution but form primary colors in basic solutions. Also discusses the free energy curve presented in many textbooks. (JM)

A dental school's experience using data on student attitudes toward a restorative dentistry laboratory course and an experiment conducted during the course to make curricular and methodological changes, and subsequently evaluate those changes, is described. The questionnaire used and response tabulations are included. (MSE)

The game of Fractional Dominoes is illustrated. (DT)

Designs on a circular geoboard lead to an investigation of factors, primes, relative primes, and modular arithmetics. (DT)

Describes a simplified diffraction experiment offered in a workshop with the purpose of illustrating to high school students the relation of science to society. The radii determined for cigarette smoke particles range from 0.2 to 0.5 micrometer in this experiment. Included is a description of the diffraction theory. (CC)

Discusses an experiment on the conservation of momentum and Q-values for elastic and inelastic collisions with frictional energy dissipation taken into account. Indicates that the apparatus is readily fabricated from easily available materials. (CC)