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?quipment. Some of these observations were quite comical, md the students added their own tales of "wrongdoings." In general, they felt that they understood some of the reasons ~ e h i n dmy constant recriminations. I received very positive reedhack and the "proof of the pudding" was the improvement ,f their laboratory techniques, a decrease in glass breakage, md an increase in their awareness of safety in general. A teaching guide is included which contains the entire script, notes to supplement some of the frames, and six sugtested activities that the teacher can use to demonstrate some 3f the techniques.
Energy and Entropy in Chemical Reactions TIME: 11to 12 min for each filmstrip FORMAT: 2 color filmstrips with 2 cassettes (manual and audible signals) Teacher's guide induded CAT. NO.: SCC82l (cassettes) SCR821 (records) PRICE: $53 SUPPL1ER:Prentice Hall Media ServCode SC 4 150 White Plains Road Tarrytown, NY 10591 This series consists of twoparts: "Energy and Enthalpy in Chemical Change" and "Entropy and Free Energy: Why Chemical Reactions Occur." These filmstrips use physical examples t o illustrate the forms of energy. Graphs are used to explain endothermic and exothermic reactions. Many basic chemical principles are illustrated in both these filmstrips. In the 11min it takes to show the filmstrio, too many principles are developed, which ruts down on i& &efulness>or the entire class. I found it more useful as a review lesson and for individual students who needed to catch up. Our library has a Dukane unit which 1 am able to lend to my st~alentsto use on their own time. A teacher's guide is provided and the entire filmstrip with both visuals and narration are reproduced. Each booklet contains three worksheets that may be copied by the teacher for use with the class,
Chemistry: The Forces in Solids, Liquids, and Gases TIME: 15 to 16 min FORMAT: 5 filmstrips with 5 cassettes (automatic and
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One of the more difficult t o ~ i c for s chemistrv students to comprehend fully is the chemical bond. Perhaps one reason to he offered for this difficulty is the lark of visual means to demnnstrate intermolecular and interionic attractive forces. This filmstri~consists of 5 parts which fairly clearly demonstrate numerous phenomena. Each of the filmstrips highlights one phase of the topic. The fust one, "What Holds Solids, Liquids and Gases Together," demonstrates the differences between covalent and ionic compounds using sodium chloride models and ammonia models. Electronegativity is explained along with Van der Waals forces. The second one. "The Hvdroeen . .. Bond." compares tne hniling points of the hydrides and the nature of the hvdrwen bond in water. The third one. "The Hvdrocen Hond . w h o cares?" is the one you can ~eavdout if you are pressed for time. I t discusses the hydrogen bond by comparing the ~
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Introducing Chemistry: How Atoms Combine TIME: 11min FORMAT: Color Film CAT. NO.: 1666 PRICE: $160 SUPPL1ER:Coronet Films 65 East South Water Street Chicago, IL 60601 I do not usually use films with my chemistry classes, because if they are too long and too boring, the students fall asleep. Sometimes I do. too. But if they - are short, to the point, and right on target, I use them. The oarticular film is only 11min long and with an introduction on my part, I use this a t the heginning of my unit on bonding. It shows diagrammatic views of the atoms with their valence electrons. An explanation is given of polar covalent, nonoolar covalent, and ionic bonding. I t presents an especially useful animated view of electron motion.
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Question Section J. M. from Texas writes to ask if anyone out there knows where to purchase films for the CHEMS courses? Are there any other good visual aides that could supplement this program? I am also looking into this for you, J. M.
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CAT. NO.: 109 PRICE: $120 SUPPL1ER:Berwall Productions, Inc 839~tewart Ave. Garden City, NY 11530
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densities of ice and liquid water. The fourth one, "Network: the Endless Bond" was an interesting one for my students since they grew tired of my endless blackboard scrihhlings, which I thought clearly demonstrated the bonding in diamond. In fact, this filmstrip was a lifesaver. I t discusses the pruperties of diamond, graphite, quartz, using electron dot diagrams, structural dingrams, and molecular models. The fifth one in the spriei, ' T h e Honding in Metals," discusses metallic properties using electron dotdiagrams and electron confiaurations. Comoarisons are made between metals and non-metals so that astudent will see the difference between the properties of theso iut~stances. A study guide is offered with the set, and additional ones are three dollarseach. 1 did not find them particularly useful, since I used the set in class as one unit. But if vou are more inclined to have your students do independent study, these euides mav he "iust rinht for vou. There is no teacher a i d e iffered so you will ha; to preview theentire series befo; you present any part to your class.
Your Turn Now it is your turn. Do you have a favorite film, filmstrip, slide-set that you find helpful in your chemistry class? Would you share this with us? Please put information in the form shown below and send it to me. We will print your comment in future issues. Please indicate if you wish your name to appear on the review. Format for Reviews
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FORMAT: CATALOG NO.: SUPPLIER:.
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448 1 Journal of Chemical Education
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