Presents an activity on chemical changes and experimentation with testing the roles of various reactants in accomplishing the changes. (Author/KHR)

Compares the revised Blue Bottle formulation to the classical Blue Bottle. Indicates that the revised formulation gives a somewhat bluer solution, but initially slower reduction when compared to the classical formulation. (Author/KHR)

Presents an experiment that is quick and easy to prepare, visually striking, and amusing to students. Relates to several key chemical concepts including polarity, intermolecular forces, solubility, and spectrophotometry. (Author/NB)

Recommends using educational technology to present images of chemical reactions to students instead of doing time-consuming live demonstrations. Uses a VCR to show hazardous chemical reactions, give instructions to organize students into groups, think about data, draw conclusions, and design an experiment. Reports that the quality of learning from…

Presents an inquiry-based science activity in which students collect data to determine whether flipping pennies and burning candles follow zero- or first-order rate laws. (KHR)

Describes a project involving the development, application, and evaluation of a virtual chemistry laboratory (VCL) that involves basic step-by-step laboratory procedures and simulates real laboratory activities. Presents the program in terms of tutorial, VCL, and evaluation, and a section that allows instructors to create their own tests. (KHR)

Presents a mystery based on the well-known characters, Sherlock Holmes and Dr. Watson. Emphasizes qualitative inorganic analysis, laboratory observations, and oxidation-reduction processes. (Author/YDS)

Demonstrates some of the chemistry of chlorine on a microscale about the size of a water droplet. Chlorine gas was prepared from an acidified bleach solution in a plastic petri dish. Provides suitable hands-on experience for students at the secondary-school level. (MM)

Describes the use of calculator based laboratory (CBL) technology in monitoring the process of chemical reactions. Explains the estimation of infinity readings and criteria to choose t values. (YDS)

Presents an activity that uses supermarket chemicals to perform a clock reaction in which the endpoint is signaled by an abrupt change in the appearance from colorless to blue-black. This activity can be used to explore reaction kinetics and the effect of reactant concentrations on the apparent rate of reaction. (DDR)

Describes an iodine clock reaction that produces an effect similar to the Landolt clock reaction. This reaction uses supermarket chemicals and avoids iodate, bisulfite, and mercury compounds. Ascorbic acid and tincture of iodine are the main reactants with alternate procedures provided for vitamin C tablets and orange juice. (DDR)

Describes a dramatic chemical demonstration in which chemicals that are black and white combine to produce a colorless liquid. Reactants include tincture of iodine, bleach, white vinegar, Epsom salt, vitamin C tablets, and liquid laundry starch. (DDR)

Reports the discovery of an efficient base composition for making bengal lights that is obtained with potassium chlorate and thiourea. Combining this mixture with appropriate flame coloring can produce several impressive bengal lights. (DDR)

Describes a chemistry demonstration on freezing point depression wherein students investigate the effects of adding various substances to ice water. Includes instructor information and a student activity sheet. (YDS)

Presents a 10-hour chemistry experiment using copper sulfate that has three steps: (1) purification of an ore containing copper sulfate and insoluble basic copper sulfates; (2) determination of the number of water molecules in hydrated copper sulfate; and (3) recovery of metallic copper from copper sulfate. (Author/YDS)