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Review of Mastery Goals After completing this chapter, you should be able to: Write the best Lewis structure for any molecule or ion. This includes determining how many electrons are available, whether multiple bonds are necessary, and satisfying the octet rule if possible. For complex molecules, however, the connectivity must be known. (Problems 1.2, 1.3, 1.4, 1.6, 1.15, 1.16, 1.17, 1.24, 1.29, 1.30, 1.31) Calculate the formal charge on any atom in a Lewis structure. (In fact, you should be starting to recognize the formal charges on some atoms in some situations without doing a calculation.) (Problems 1.8, 1.18, 1.26, 1.30) Estimate the stability of a Lewis structure by whether it satisfies the octet rule and by the number and the distribution of the formal charges in the structure. (Problems 1.5, 1.9, 1.19, 1.20, 1.36) Recognize some simple cases in which resonance is necessary to describe the actual structure of a molecule. However, a better understanding of resonance will have to wait until Chapter 3. (Problems 1.10, 1.23, 1.25, 1.34, 1.35, 1.39) Arrange the atoms that are of most interest to organic chemistry in order of their electronegativities and assign the direction of the dipole of any bond involving these atoms. (Problems 1.11, 1.21, 1.37) Determine the shape of a molecule from its Lewis structure by using VSEPR theory. (Problems 1.12, 1.13, 1.21, 1.22, 1.24, 1.29, 1.34, 1.35, 1.36) Determine whether a compound is polar or not and assign the direction of its dipole moment. (Problems 1.14, 1.21, 1.24, 1.38) 13