ylene and Polystyrene; Synthesis and Properties of Pulystyrene; Thermoplnrtic Pulymcrs; Deilvtein Teat fnr Polyvinylchloride;Preparation of Methyl Metharrylate. The videodisc medium obviates concerns that normally accomoanv demonstrations: safety, availahility and diiposal of reagent& aost and time of constructing apparatds, and visibility of the presentations.
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chiral molecules are shown clearly, as are laboratory techniques. Teachers of introductory courses will also find this disc very useful, because it shows many demonstrations commonly done a t that level that involve hazardous materials or uncommon apparatus or substances. Examples are combustion of methaneloxveen mixtures. conformations of alkanes, relationship between structure (intermolecular forces) ~ - ~,and boiline ooints. chromic acid oxidations. chemiluminescence, silver mirror-Tollens Test, reactions and pH of organic acids and bases, effect of pH on proteins, dyes and dyeing, and polymers. ~~
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About This lssue John W. Moore and Jon L. Holmes University of Wismnsin-Madison Madison, WI 53706
Organic demonstrations have been used less frequently than those involving inorganic chemistry because of safety hazards, expense and availability of reagents, and visibility of the reactions. The videodisc overcomes these problems and also allows slow reactions to be compressed to a few minutes of video. Users of this videodisc will find that by providing a single viewpoint that applies to everyone in the audience it makes clear a number of points that are difficult to get across in a tvoical lecture. For example, the relationship between molecular structure and a projection formula is nicely shown by using a light source to project a shadow of a molecular model onto paper and then drawing a projection formula on the uaper . - with the model still present. In addition. the disc contains a l a x e number of organic reactions presented in an interesting, visual manner. Photochemistry and the rotation of plane-polarized hght hy
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Journal of Chemical Education
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HaldwarelSoftware Required "Demonstrations in Organic Chemistry" is a 12-in., double-sided, 60-minute, CAV-type video laserdisc in NTSC format (it is incompatible with the PAL standard used in many European countries). It may be operated from any videodisc player using a hand-held remote-control keypad or a barcode reader. To make the video presentation visible to students in a classroom either a large-screen color monitor or a color video ~roiectionunit will be needed. The size of the monitor (or'& need for a projectionunit) depends on the size of the class to which the presentation will be made. To Order This lssue Journal of Chemical Education: Software (often called JCE: Software) is a publication of the Journal of Chemical Education. There is an Order Form card inserted in this issue. If this card is not available. contact: JCE: SoRware, Department of Chemistry, university of ~ i s c o n s i n l ~ a d i son, 1101 University Avenue, Madison, WI 53706-1396; 608/262-5153 (voice);6081262-0381 (FAX).
