Two one-day conferences and a summer institute were held to provide inservice training for chemistry teachers. Brief descriptions of and conclusions related to these programs are provided. It is pointed out that such programs can be conducted without great expenditures of money and that various institutions/organizations are willing to help. (JN)

Discusses instructional strategies that help students make and differentiate between observations and inferences, including the use of analysis, synthesis, and evaluation processes. Suggests that early activities focus on analytical procedures in such a way that they can be explained in terms of facts and principles that students will readily…

Reports on presentations and discussions at a meeting (called Powwow) designed to examine and evaluate the current status of computer use in chemistry and to consider appropriate directions for future developments involving computers in the chemistry curriculum. Also reports on activities of Project SERAPHIM. (JN)

Two demonstrations are described. The first shows the effect of polarity on solubility. The second is based on the unexpected formation of a precipitate of barium nitrate when barium carbonate or barium phosphate is treated with dilute nitric acid. List of materials needed and procedures used are included. (JN)

Discusses six educational and economic reasons for using demonstrations in a high school chemistry classroom. Also discusses reasons for doing lecture demonstrations as an integral part of college chemistry instruction. (JN)

Four questions chemistry teachers should regularly ask are How well informed am I on safety? Do I instruct students about safety in an appropriate manner? How well do I plan for safety? Do I accept my responsibility to supervise personally all laboratory activities? Answers to these questions are provided. (JN)

Discusses strategies and activities used to introduce chemistry topics to kindergarten children. These topics include atoms, acids and bases, and molecules and gases. (JN)

Clarifies where in the scheme of modern chromatography high performance thin layer chromatography (TLC) fits and why in some situations it is a viable alternative to gas and high performance liquid chromatography. New TLC plates, sample applications, plate development, and instrumental techniques are considered. (JN)

Background information, list of materials needed, and procedures used are provided for an experiment designed to introduce undergraduate students to the theoretical and technical aspects of column chromatography. The experiment can also be shortened to serve as a demonstration of the column chromatography technique. (JN)

Describes a rapid, visual demonstration of protein separation by gel filtration chromatography. The procedure separates two highly colored proteins of different molecular weights on a Sephadex G-75 in 45 minutes. This time includes packing the column as well. Background information, reagents needed, procedures used, and results obtained are…

Background information, list of materials needed, and procedures used are provided for a simple technique for generating mechanically plotted acid-base titration curves. The method is suitable for second-year high school chemistry students. (JN)

Describes a colorimetric titration instrument usable in the undergraduate laboratory that fulfills the objectives of ruggedness, freedom from ambient light interference, and low cost. Although accessories can be added (raising the price), the basic instrument is low priced and can be used manually with a simple voltmeter. (JN)

The design and use of an inexpensive thermistor thermometer is described. In addition to providing a rugged thermometer, using the instruments offers an opportunity to have students become familiar with new principles and techniques, such as principles of thermistors, the Wheatstone bridge, and the concept of calibration. (JN)

Discusses the valence-bond method, applying it to some coordination compounds of metals, especially those involving metal-metal bonds. Suggests that transition metals can form as many as nine covalent bonds, permitting valence-theory to be extended to transition metal compounds in a more effective way than has been possible before. (JN)

Discusses electronegativity equalization using Pauling units. Although Pauling has qualitatively defined electronegativity as the power of an atom in a molecule to attract electrons to itself, Pauling electronegativities are treated in this paper as prebonded, isolated-atom quantities. (JN)