Teacher flexibility is also possible in the order in which the topics are presented. For examole. the chanter on eauilibrium miabt br conai&rrd by &me i n s r r b r s to he mire appropriate before considering rlwrnodynamlrs. The reverse ordrr ir presented hy the authors. The worked-out exercises, a strong The authors state in the preface that feature of the first edition, have been ex" 'Chemical Principles,' Second Edition, is panded and there are now more than 1100 written in the belief that a chemistry textend-of-the-chanter exercises. Answers to book must meet the needs of both students swnr are in an appcndix. These uller still and teachers. Our goal has been to meet thaae mure flexibility to the instrwtor. needs by writing a haok that is bath com,\ fair "mount ul descriptive material has prehensible and comprehensive, combining been presented as an integral part of the clarity of exposition with completeness of presentation of chemical principles. Chapters presentation." In the opinion of this reviewer on nonmetals, water, and metals show ample their e n d has almost heen met. The treatillustrations of principles developed in earlier ment Ef topics is clear and very thorough and chapters. A feature of the first edition, only a few chapters, such as theone on ther"Topics for Today," has been continued. modynamics, contain material that may he These are fifty topics of current interest, such too difficult for mast freshman. A knowledge as "Acid Rain and Our Environment," The of simple algebra plus some high school Search for a Superhattery," and "The Accichemistry (not stated by the authors as a redent a t Three Mile Island" which illustrate quirement but definitely useful) are all that the importance and usefulness of basic are needed hy a student who uses this chemical principles. hook. As might be expected in an 800-page hook The first edition of this text received a there are a number of typographical and generally favorable review (Anderson, W. P., factual errors which occasionally mislead the J. CHEM. EDUC., 56, A223 (1979)) and the reader. For example, atable (p. 17) states that basic framework is the same. New material, the nan-SI unit of mass is the pound and not new illustrations, and a new book design until much later (p. 52) do we learn that this make this edition even more readable than is not correct. An untraviolet spectrum (p. the first. The chapter on "States of Mater" 250) is shown but called an infrared spectrum has been rewritten to clarify some derivations in the text. Some missing bonds in figures and to allow the instructor more flexibility in showing molecular structures (pp. 254 and presenting the material in the classraom. 260) may lead t o a little confusion. Eqn This, incidentally, is apparent in all chapters (13.22) (p. 431) which relates t o a general of the haok. The discussion of the VSEPR chemical reaction given on the previous page model and other asneets of molecular eeomis missing two terms. A statement (p. 603) etry have I w n exp~lndedin the rhaprr.r on "But the two elementary reactions occur "hldeculsr Struerun nnd Stnl,ilily." .A d r as written." (regarding the deeomtailed discussion
