Describes a typical presentation in which slime is prepared for young, concrete operational students. Includes the procedures used and a summary written by a fourth-grade teacher after completing the slime experiment with her class. (JN)

Dynamic crystal model kits are described. Laboratory experiments in which students use these kits to build models have been extremely successful in providing them with an understanding of the three-dimensional structures of the common cubic unit cells as well as hexagonal and cubic closest-packing of spheres. (JN)

The three-phase study described involved: (1) diagnostic investigation of students' views about structure in chemistry (after studying chemistry for half a year); (2) development and implementation of a program designed to present some misconceptions identified in the first stage; and (3) an evaluation of the program. (JN)

The Nebraska Instrument Sharing Consortium (NISC) is a group of small colleges that have banded together to provide modern instrumentation to their students at an affordable price. Consortium activities are described, including how the instruments are moved between campuses. (JN)

Discusses a computer interfacing course using Commodore 64 microcomputers; a computer program for radioactive equilibrium; analysis of near infrared spectrum of hydrochloric acid molecules using Apple II microcomputers; microcomputer approach to conductivity titrations; balancing equations with Commodore 64's; formulation of mathematical…

The best-characterized gas evolution oscillator is the dehydration of formic acid in concentrated sulfuric acid. Reports on an improved demonstration which exhibits at least as dramatic behavior, although for a shorter time. Includes background information, principles illustrated, procedures used, and typical results obtained. (JN)

Discusses topics and issues related to conducting dangerous and/or potentially dangerous demonstrations. Includes a number of resources that secondary and college teachers can consult for additional information. (JN)

Background information, list of materials needed, and procedures used are provided for a demonstration involving the transformation of a hydrophobic liquid to a partially hydrophobic semisolid. Safety considerations are noted. (JN)

Describes a scheme in which students are arbitrarily paired and presented with a menu of 11 experiments (as well as a figure illustrating their relationships). Each student performs seven experiments in triplicate during the 11 3-hour laboratory periods. Goals of this course are included. (JN)

Discusses effects of Kimax and Pyrex glass on: (1) 0.4956 molar (M) ethanolic potassium hydroxide; (2) 0.1116 M aqueous sodium Hydroxide (NaOH); (3) 0.01081 M aqueous NaOH; (4) 0.001148 M aqueous NaOH; and on (5) distilled water. (JN)

Cautions chemists to be wary of ferromagnetic samples (especially magnetized samples), stray electromagnetic radiation, dusty environments, and changing weather conditions. These and other conditions may alter readings obtained from electronic analytical balances. (JN)

Discusses materials needed, procedures used, and typical results obtained for an experiment involving a dry attack of ores with pyrosulfate flux. The experiment has been carried out by about 150 students a year with a demonstrator-to-student ratio of about 1:15 with no serious accidents. (JN)

Background information is provided on the registered trademark "TLV" (Threshold Limit Value), the term used to express tolerable concentrations. The TLV of a compound is an estimate extrapolated from some defined damage to humans or animals at higher concentrations or by drawing analogies between similar concentrations. (JN)

Suggests how postage stamps can be incorporated into chemistry teaching. Categories considered include emergence of chemistry as a science, metric system, atoms (and molecules and ions), stoichiometry, energy relationships in chemical systems, chemical bonding, nuclear chemistry, biochemistry, geochemistry, matter (gases, liquids, and solids),…

Describes a bonding theory which provides a framework for the description of a wide range of substances and provides quantitative information of remarkable accuracy with far less computational effort than that required of other approaches. Includes applications, such as calculation of bond energies of two binary hydrides (methane and diborane).…