Presents an activity that enables students to gain a better understanding of the importance of polymers. Students perform an experiment in which polymer chains of polyvinyl acetate form crosslinks. Includes background information and discussion questions. (DDR)

Presents numismatic experiments that cover a range of topics that tie physical science and chemistry to society and history. Discusses measuring length; measuring mass; metals, alloys, and amalgams; reactivity of metals and electrochemistry; reactions of metals with acids; money to burn; magnetic properties of coins; inertia; refraction;…

Describes the biochemistry component of study to become a medical technologist in a Chilean university. Provides details of program structure, course content descriptions, and teaching strategies. (DDR)

Considers the possible relations among instruction, content, and assessment. Presents a rationale for and examples of demonstration-based testing activities. Highlights student performance and reaction to these assessment methods. Contains 13 references. (JRH)

Presents information about the chemistry of color-changing markers. Discusses the importance of acid-base reactions and oxidation-reduction chemistry. (DDR)

Demonstrated in this article are some of the capabilities of a spreadsheet program using data obtained in gas law experiments and a computer interface system. The ability to organize and analyze data which a computer can provide for the student is emphasized. (KR)

Described is a solar science activity designed to show students how light energy can be directed to produce visible chemical changes by making sunprints. Included are the materials, procedure, and safety considerations. (KR)

Described is a team assignment where groups of students work on stoichiometry problems that apply to the real world. Teams of students act as chemical companies that have orders to fill for a customer. Included are the details of the customer order, student participation, and the evaluation procedure. (KR)

Reorganization in the National Science Foundation's science education section is discussed. Personnel changes and changes in funding in 1990 are emphasized. (CW)

Described is a demonstration which involves the ingrowth of members of the radon-222 decay series. Laboratory procedures, equipment, analysis, and results are discussed. (CW)

Described is a simple and interesting chromatography experiment using three different fluorescence detection principles for the determination of caffeine, saccharin and sodium benzoate in beverages. Experimental procedures and an analysis and discussion of the results are included. (CW)

The need to give high school students a more pragmatic grasp and understanding of technology, in addition to guidance concerning their career paths, is discussed. Described are the design, initiation, methods, topics and evaluation of this exploratory program. Recommendations for future implementation of similar programs are provided. (CW)

Presented is an experiment which can be used in a first-year chemistry class to introduce the synthesis and analysis of compounds. Described are the experimental procedures, sample data, analysis, and discussion. (CW)

The evolution of ideas about the concept of chaos is surveyed. Discussed are chaos in deterministic, dynamic systems; order in dissipative systems; and thermodynamics and irreversibility. Included are logistic and bifurcation maps to illustrate points made in the discussion. (CW)

Presents a laboratory experiment which illustrates the formation of tris(phenanthroline)cobalt complexes in the 2+ and 3+ oxidation states, the effect of coordination on reactions of the ligand, and the use of a ligand displacement reaction in recovering the transformed ligand. Uses IR, UV-VIS, conductivity, and NMR. (MVL)