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เนื้อหาย่อ : nistry is one of the important studies in science. Today, nearly ev phase of our lives is affected by the results of scientific activity. In the last three hundred years during which man has taken a scientific approach to the understanding and control of his environment, the conditions of his life have anged more than in all of the preceding hundreds of thousands of Impressive as this may be, there is the more imposing possibility that the in- e of science on man's life will become even greater in the f w of this, it is certain that all of us must have some understanding scientific activity is, how it is carried on and how it will affect mankind. The study of chemistry is one way to become familiar with these things. Chemistry deals with all of the substances making up our environment and th the changes these substanices undergo. These changes may seemingly simple and commonplace ones as the burning of a candle, or such complicated and delicately balanced ones as the processes that sustain life wn bodies. The substances themselves may be such hard a materials as rocks and steel or such apparently insubstantial ones as the gases of the air. book, called CHEMISTRY : An Investigative Approach, prese ry as it is today.Great emphasis is placed on the activities of exp n and observation as the basis for all knowledge of chemistry or in other physical science. The unifying principles of the subject are developed in a logical way with laboratory work providing a basis for this development. In chemistry, as with any other science today, after hundreds of thousands of man-years of work there are many more facts known than any person can hope to memorize. But science is not simply a collection of facts. Essentially science is the understanding or interpretation of those facts in a consistent way. In other words, what one really wants to acquire is a grasp of the prin- ciples upon which the facts ultimately rest. In this book we emphasize these principles and the way they have been, can again be, derived from experimental observation. You will be in scientific activity in fundamentally the same way as any scientist is en- ged. In other words, to some extent you will become a scientis study chemistry. At the end of this course you may be acquainted with only a small fraction that is known about the science of chemistry. You will know e however, to realize that all of the things that you do not know (some of which as yet, nobody knows) are not unknowable. On the contrary, they can be- come understandable when approached with the proper logical scientific thods. We hope further that you will be persuaded by your exp this course that the exploration of new frontiers in chemistryㅡor any scienceㅡ is an activity full of excitement and pleasure.