EXERCISES IN CHEMISTRY SYSTEMATICALLY ARRANGED TO ACCOMPANY THE SECOND REVISED EDITION OF "AN. ELEMENTARY STUDY OF CHEMISTRY" Lane T 22.9.19.555 HARVARD COPYRIGHT, 1906, 1919, BY WILLIAM MCPHERSON AND WILLIAM E. HENDERSON ALL RIGHTS RESERVED 523.10 The Athenæum Press PREFACE The exercises contained in this book are systematically arranged to accompany the revised edition of McPherson and Henderson's "An Elementary Study of Chemistry." It has been thought desirable to include in the list a somewhat larger number of exercises than will ordinarily be performed, thus giving the instructor some choice in his selections. A number of simple exercises bearing on subjects of special interest to students of home economics are included under Appendix A. These have to do with simple tests for food constituents, detection of different kinds of textile fibers, and similar topics. If time is not available for the students interested in such subjects to perform these experiments in addition to the regular ones, the instructor may find it possible under the circumstances to make certain substitutions that will appeal to his judgment. While the experiments selected cover a wide field and are believed to illustrate the general topics included in the presentation of an introductory course in chemistry, nevertheless they may be performed with simple apparatus and with chemicals that are readily available. Detailed information in regard to the apparatus and materials required for performing the experiments will be found in Appendix B. It is no longer necessary to emphasize the importance of laboratory work as a part of the course in elementary chemistry, since it is universally admitted that laboratory experience is essential for a thorough comprehension of the subject. It is none the less true, however, that laboratory work is of very doubtful value unless carefully directed by an experienced teacher toward some definite end. It is in the hope of aiding such a teacher that this exercise book has been prepared. |