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| Special Issue 14 | ||
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| In This Issue | ||
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| ChemDemos II | ||
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John W. Moore, Jerrold J. Jacobsen, and Kelly Houston Jetzer University of Wisconsin-Madison, Madison, WI 53706-1396 George Gilbert Denison University, Granville, OH 43023 Fred Mattes Hastings College, Hastings, NE 68902-0269 David Phillips Wabash College, Crawfordsville, IN 47933 George Lisensky Beloit College, Beloit, WI 53511 Gerald Zweerink Missouri Western State College, Saint Joseph, MO 64507
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| About This Issue | ||
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Note: |
Order Item Number: SP-14 |
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How to Use These Materials ChemDemos II has been designed to address problems many teachers face in providing their students with views of important chemical reactions: safety, availability of substances and apparatus, and disposal of toxic or hazardous substances. The demonstrations on this disc have been selected because one or more of these problems is likely to prevent a teacher from doing the demo live. Thus the disc provides an important resource for first-year chemistry courses. Every demo on the disc illustrates at least one principle that is an important component of such a course and that might not otherwise be demonstrated. ChemDemos II can be used stand alone with only a videodisc player and hand control or barcode reader for classroom presentations. If a videodisc player with a serial connection for a computer is available, demos can be shown even more easily under computer control using Videodisc Browser (1, 2). Whether the disc is used stand alone or with a computer, students will see close-up views of each reaction, and a teacher can direct their attention to important observations as well as provide interpretations of what is seen. The laser videodisc medium allows for immediate access to each demo, pausing, backing up, viewing in slow motion, repeating, and carefully examining what is happening. The documentation provides information about each demonstration including topics for which the demo is suitable. For example, Effusion of Gases demonstration can be used in discussions of density, gas laws, molar mass, and pressure. The Critical Point of Benzene demonstration illustrates phase changes, physical properties, and states of matter. ChemDemos II can also be used by students individually or in small groups. Using the printed documentation a teacher can prepare written materials that direct students to view appropriate demos, make observations, and draw conclusions. This can be done using frame numbers and a hand control, with barcodes (barcodes in the documentation can be photocopied into locally produced materials for this purpose), or a computer lesson can be generated with Videodisc Browser if computer control is available. The demos can also be built into computer-based materials developed by an individual teacher. Such materials can be created using HyperCard (3) on a Macintosh, ToolBook (4) under Windows on an IBM computer, or other such multimedia authoring systems. Such uses are allowed, even encouraged, provided they are noncommercial. Submission of multimedia presentations including video from ChemDemos II (or any JCE: Software videodisc) for publication in JCE: Software is also encouraged. Hardware and Software Requirements ChemDemos II is a 12-in., double-sided, 60-minute, CAV-type videodisc 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. (Consult the supplier of your videodisc player to ascertain whether it can be used with a barcode reader.) To make the video presentation visible to students in a classroom either a large-screen color monitor or a color video projection unit with sound output is needed. The size of the monitor (or the need for a projection unit) depends on the size of the class to which the presentation will be made. If the disc is to be used under computer control the videodisc player must have a serial (RS-232) interface. A text file for the videodisc compatible with Videodisc Browser 2.0 for both Macintosh and IBM compatible computers is included. Acknowledgement The following people contributed significantly to the development of this videodisc. Their assistance is gratefully acknowledged: Ron Perkins, Greenwich High School, Greenwich, CT; Doris Kolb, Bradley University, Peoria, IL; George Hardgrove, St. Olaf College, Northfield, MN; and Eric Bode Jacobsen, University of Wisconsin-Madison, Madison, WI. Literature Cited Availability
Available: Now
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Last Updated: March 19, 2001 Created: December 10, 1996 |
Created by: J.L. Holmes Comments to: jceonline@chem.wisc.edu |
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| © 1997 Division of Chemical Education, Inc., American Chemical Society. All rights reserved. | |