give the student a feel for the size of the accelerator. The particle accelerators are described and student interest should evolve a t this point. Nuclear fusion reactions are described. Practical applications of radioactivity including the uses of labeled comoounds. carbon-14 datine. ... and neutron activation analysis are examined. Measurement of reaction rates by tracers are described usine Fez+ and Fe3+ solutions. Even Stonehenge is seen as theucarbon-14 dating method is described to establish its age a t 3800 years. Using both sets in this series will allow the teacher to go from theory to practical applications. The transition from nuclear bombardments that produce radiation to the uses of this radiation could lead to some valid dehate within the class if the teacher so desires. Using the f a d s presented in this unit will allow the student to see the value of the chemistry lesson in order to determine the pros and cons to the nuclear use debate. In Nicholas Mammano's account "A Chemistry Lesson a t Three Mile Island" [J. CHEM,EDVC.,57, No. [4] (April 1980)) he said,
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Figure 2. Diagram of cyclotron from Pmgram 857. Reproduced courtesy of Prentice-Hall.
As the news accounts unfolded during the early days of the accident, the incident (Three Mile Island) became a focus of some Lively and instructive discussion in my freshman chemistry class. In fact, I scrapped my original lecture plan and developed a completely new presentation of nuclear chemistry. . .
He goes on to encourage the chemistry teacher to show that science is relevant and exciting and, that hy using the current examples in the news, one can make the classroom a reason for being.
Introduction to Chemical Nomenclature Format:
Time: Cat. No.:
Price Range: Supplier:
Complete series (No. 840) contains three color filmstrips, three sets of matching slides, three audio cassettes, Workbook. (This is also available without the slides.) Each program is approximately 20 to 30 min. WLC840FS (Complete set with filmstrip and slides.) WLC840FC (Complete set in filmstrip version.) WLC841 "Metal-Nonmetal Compounds." WLC842 "Nonmetal-nonmetal Compounds." WLC843 "Coordination Compounds and Other Special Topics" $109- 159 Prentice-Hall Media 150 White Plains Road Tarrytown, New York 10591 800-431-
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Chemistry teaches a system of naming compounds which include many ~ l e sThis . filmstrip series develops, in a precise manner, the naming of metal-nonmetal compounds; nonmetal-nonmetal compounds; polyatomic compounds; and oreanometallic comoounds. Aeain the series can he used either " as an introduction, a review, or by the student in a tutorial situation. There are numerous charts. diaerams. and tables showing electrmennri\.ity relncionships, formula writing, and coordinated cumr,lexes. 'l'ht. taoe runs a little fast for notetaking; therefon:, the tenul~erwill nced to stop the audio at intervill; to allua information to be 3hwrbed 2nd to a n w r r student questions. P r o g r a m 841: "Meta-Nonmetal Compounds" describe molecular formulas. The rules for naming chemical com-
414
Journal of Chemical Education
c,s-Te,raamm,ned,chlorombal,(m) chiorlde
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Figure 3. Geometrical isomers of wtahedral coordination compounds from Program 843. Reproduced courtesy of Prentice-Hall.
pounds and substances are given with many examples. Electronegativity is explained. Oxidation numbers are introduced and the rules for using them to produce chemical formulas are given. P r o g r a m 842: "Nonmetal-nonmetal Compounds" continues the previous program showing the halogen and hydrogen compounds. The naming of the acids is shown very .. systematically. Program 843: "Coordination Compounds and Other Special Topics" introduces coordinate covalent bonds and the naming of these compounds. There is a comparison shown between the IUPAC naming system and the older one, e.g., [Co(NH3)4Clz]+is shown as tetra ammine dichloro cobalt(II1) in the IUPAC system and dichlorotetraammine cobalt(II1) in the older system. Geometrical isomers such as Pt(NH3)zClz are diagrammed. Naming organometallic compounds are explained, for instance, Cr(CO)6, hexacarbonyl chromium, is shown and the following formula is shown to be 2-ethyl-lmethoxy-I-methyl-3-phenyl-3-silyl pentasilane.
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H C,H, C?Hs OCH, In all, thrsr three programs indicate to thestudent pauses in order for the itudrnt to du thcexercises i n the workl,mk. These pages may be reproduced for the class with the permission of the Prentice-Hall Media. T h e answers are provided.
