Visualizing Chemistry

14 The following alkyl halide can be prepared by addition of HBr to two different alkenes. Draw the structures of both (reddish brown = Br). 

16 Electrostatic potential maps of (a) formaldehyde (CH20) and (b) methanethiol (CH3SH) are shown. Is the formaldehyde carbon atom likely to be electrophilic or nucleophilic What about the methanethiol sulfur atom Explain. 

18 Look at the following energy diagram for an enzyme-catalyzed reaction  

19 Identify the functional groups in the following sub.stances, and convert each drawing into a molecular formula (red = O, blue = N)  

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Each chapter in this book provides many problems of different sorts. The inchapter problems are placed for immediate reinforcement of ideas just learned, while end-of-ebapter problems provide additional practice and are of several types. They begin with a short section called "Visualizing Chemistry," which helps you "see" the microscopic world of molecules and provides practice for working in three dimensions. After the visualizations are many "Additional Problems." Early problems are primarily of the drill type, providing an opportunity for you to practice your command of the fundamentals. Later problems rend to be more thought-provoking, and some are real challenges. 

Summary and Key Words 774 Summary of Reactions 775 Visualizing Chemistry 776 Additional Problems 777... 

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