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Ch Col Education JOURnflL OF MARCH 1984 Ch col Education Published by the DIVISION OF CHEMICAL EDUCATION OF THE AMERICAN CHEMICAL SOCIETY Before you order chemicals again, stop and think. If you've been ordering from the same chemical We carry over 25,000 catalog items In addition to suppliers for years, stop and think about it. You could chemicals, so we're aiso your best "one-stop" source be getting better quality and much more reliable for other science teaching products as well. So when service at a better price. you put together your next chemical order, start a new Carolina has been supplying chemicals to the habit—the Carolina habit. scientific community for over 30 years. We keep thousands of chemical products in stock year-round, Want more information? Write us or call our Customer so you're assured of getting what you need, and at Service Department at 919 584-0381. competitive prices. And our professional staff has the experience and dedication to make sure you get what you need when you need it—our service is unsurpassed. Get the Carolina habit. Carolina Biological Supply company 2700 York Road Box 187 Burlington, North Carolina 27215 Gladstone, Oregon 97027 Circle Ho. S on Raadsii' Inquiry Card Today's academic laboratory is a modern Who flowmeters, and other equipment facility that trains students to control them properly. for careers in the high tech- Says It's an Safety in the laboratory is nology job market. Such a important. To aid you in the laboratory needs equipment safe handling and storage and supplies that are as Ivory Tower? of gases, we have flash sophisticated as the laboratories that arresters, toxic gas detector systems, hand will one day employ these students. Matheson trucks and cylinder stands. We also have a has a complete selection of gases and equipment system for buying back empty lecture bottles for the modern laboratory. We have more than so that you won't be stuck with a disposal 80 different gases and prepare gas mixtures to problem. Keep your students in the forefront your specifications. No matter which gas or of technology. Send for a catalog describing mixture you use, Matheson has regulators, our products, prices and specifications. Matheson belongs in the modern laboratory. fcgflatheson ••Gas Products World Leade30 Seavier rwn SpecialtDrive, Secaucusy Oase, sK JS .0709 Equipmen4 t Circle No. 18 an Readers' Inquiry Card Volume 61 Number 3 March 1984 A71 YOUR ACCESS TO EXCELLENCE BEGINS HERE. HP's advanced diode array tech- nology offers scan speeds as brief The H P 8450A is particularly well For added cost-effectiveness both suited to multi-kinetics, differential as 0.1 sec from 190 to 820 nm. systems can be used as LC detectors. measurements and similar applica- And, the HP 8451A can also be used tions where time-stability and Resolution ranges from 1 to 2 nm as a stand-alone desk-top computer. dual beam capabilities are crucial to depending on the system. successful analysis. Price: 527,500.* The HP8451A provides a quality of Muiticomponent analysis of up to results comparable with Ihe HP8450A 12 components is possible with but features a single beam mode and both systems. operating parameters that adapt it well to quality control, educational and other analysis situations in which many samples must be processed. Price: $14,200." OnlyHPUV/VIS spectrophotometers give you a choice of ways to easily do the once-impossible. The high speed and multi-compo- The HP 8450A is a powerful dual 'tour HP Analytical representa- nent Capability of Hewlett-Packard's beam diode array spectrophoto- tive can help you determine the diode array spectrophotometers meter that will satisfy your most system best fitted to your labora- remain unchallenged. No othes rigorous research requirements. tory's needs and can also tell you UV/V1S has the wavelength repro- The HP 8451A is an extremely cost- how to qualify for HP's special ducibility, diode array detector, effective single beam system de- 15% educational discount. For and maximum likelihood statistics signed to meet the day-in, day-out moi e information call your local to provide a comparable level of demands on your laboratory HP sales office listed in the tele- phone directory white pages, and precision and accuracy. No other facilities. Overiapping capabilities and equally rigorous performance ask lor an Analytical product approach allows you the flexi- parameters allow you to select representative. Or, write; Hewlett- bility of real-time muiticomponent your system today with an eye Packard Analytical Group, 3820 analysis, And, only HP offers to budget constraints, possible Embarcadero Road, Palo Alto, this sophisticated technology in multiple applications, and potential CA 94303. two versions, one just right for future uses. .your laboratory. U.S, Domestic prices only. HEWLETT PACKARD Circle Reader Service Number 34 for more information J. J, LAGOWSKi, Editor University of Texas at Austin March 1984 Volume 61, Number 3 Austin, Texas 78712 Assistant Editor: JOURflffL Of Oebora Ann Blttaker Editorial Assistants Linda Davis Kyle George V. Oilver Chemical Education Rebecca Chambers Marie S. Stephens Owned and Published by the DIVISION OF CHEMICAL EDUCATION OF THE AMERICAN COMICAL SOCIETY JAMES V. DEROSE Publications Coordinator Articles in this Issue ADVERTISING MANAGEMENT CENTCQM, LTD. P.O. Box 231 25 Sylvan Road South The G. N. Lewis Symposium Weatport, Connecticut 06881 (203)226-7131 185 Reflections on the Electron Theory of the Chemical Bond: 1900-1925 (For list ol offices, see page A78) Anthony N. Stranges NEW PRODUCTS 191 Abegg, Lewis, Langmuir, and the Octet Rule William B. Jensen Shirley SJeratzki 201 G. N. Lewis and the Chemical Bond Linus Pauling Journal of Chemical Education Centcom, Ltd. 204 The Triplet State: An Example of G. N. Lewis' Research Style 60 East 42nd St. Michael Kasha New York, N.Y. 10165 (212) 972-9660 Subscription Fulfillment Department 20th S Northampton Sts. Articles of General Interest Easton, Pa. 18042 SECONDARY SCHOOL EDITOR 217 Photoelectrochemical Solar Cells John T. McDevitt Mickey Sarquis 221 Thermodynamic Inefficiency of Conversion of Solar Energy to Work Miami Unlversity-MidcHetown Mlddletovm, OH 45042 Arthur W, Adamson, James Namnath, V. J. Shastry, and Vida Slawsort 22S The Evaluation of Empirical Resonance Energies as Reaction ASSOCIATIONS EDITORS Vasu Dev Enthalpies wlih Particular Reference to Benzene California Association of Chemistry Teachers Philip George, Charles W. Bock, and Mendel Trachtman Percy Ehrllch 246 The Basic Elements of Writing a Scientific Paper: The Art of Scientific New England Association of Chemistry Teachers Style Carol Potera 248 Scenarios In Science Sharon J. Sherman and Alan Sherman BOARD OF PUBLICATION Division of Chemical Education D. W. Brooks W. B. Cook D. A. Davenport Features I. D. Eubanks M. H. Gardner D.Kotb 183 Editorially Speaking J. W. Moore W. J. Stratton 230 Report of the Polymer Core Course Committee: Inclusion of Polymer Topics in Undergraduate Inorganic Chemistry Courses The Cover 237 Textbook Forum: Who is Anti-Markovnikov? J. M. Tedder The spectral distribution of energy from tfie 251 Tested Demonstrations edited by George L. Gilbert son is used on this month's cover to draw 267 Letters our readers' attention to several articles in A83 Safety in the Chemical Laboratory edited by Malcolm A. Renfrew this issue which discuss the problems of Experiments Integrating Evaluation of Chemical Hazards into the converting this energy to useful work. Chemistry Curriculum J. T. Pierce, S. M. McDonald, and M. S. Scogin A89 Topics in Chemical Instrumentation edited by Frank A. Settle, Jr. col education Choosing the Right Instrument: The Modular Approach; Part fl Howard A. Strobei A113 Book Reviews Secondary School Chemistry 216 A Simple Aid for Teaching the Theory of Aiomic Structure Hung-cheh Chiang and Chirtg-Hwei Tseng 228 A Place for Chemists: Analytical Chemistry Michael D. Seymour 236 Discovering Watson's Crick in High School Chemistry Mark Whitman )LAR 239 Goals Why Teach Organic Chemistry Leallyn S. Ciapp ERGY The Place of Organic Chemistry in the High School Curriculum Mary C. Johnson (Continued on page A74) Volume 61 Number 3 March 1984 A73 241 Profiles in Chemistry: Neoprene and Nylon Stockings: The Legacy of Wallace Hume Carothers Carol Cummings Capture a 242 The Density of Solids Dale Burgess 243 Use of the Computer for Chemistry Instruction Robert Suder Teacher 249 Thumbnail Sketches: Is Sugar from Sugar Beets the Same as Sugar from Sugar Cane? W. Conard Fernelius and you 250 Safety Tips: Peroxides Can be Treacherous Miriam C. Nagel 255 Filtrates and Residues: Spectrophotometry: Mechanics and Measurement Susan M, Dieht-Jones capture a 266 What's Happening in Your Part of the Country? Generation The haif-billion dollar academ- ic market for scientific products is composed of professors who 252 Chemical Storage of Solar Energy Usfng an Old Color Change teach, who buy in volume, and who Demonstration L. Gene Spears, Jr. and Larry G. Spears read... 257 A New Method of Separating 210Pb from Ra-DEF for a Radioactive Equilibrium Experiment C. M. Wai and J. M. Lo 259 Growth and Decay: An Experiment Demonstrating Radioactivity Relationships and Chelate Solvent Extraction Separations D. M. Downey, D. D. Farnsworth, and P. G. Lee 262 Phosphorus Determination by Derivative Activation Analysis; A Multlfaceied Radiocnemical Application E. W. Kleppinger, E. H. Brubaker, R. C. Young W. D. Ehmann, and S. W. Yates 264 HPtC Analysis of Chlorophyll a, Chlorophyll b, and ^-Carotene in Coilard Greens: A Project for a Problem-Orlenled Laboratory Course Augustine Silveira, Jr., Jerry A. Koehler, Edward F. Beadei, Jr., and Pearle A. Monroe 190 The Amazing Periodic Table James E. Fintiolt 258 A Simple Method for Cleaning Mercury Benjamin Jenkins and Ian D. Jenkins Sell Today/ 261 Double Balloons—Long Term Protection for Sensitive Materials Robert C.
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