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12. Which of the following gives the correct relationships among the first ionization energies of the elements? 1. Na > Al > P 2. Rb > K > Li 3. Se > S > O 4. He > Ne > ArA. 1 only B. 2 only C. 3 only D. 4 only E. Both 3 and 4 are correct. Supplemental ProblemsCHEM 110 - Spring 201121
Chapter 8 1. Which of the following compounds would have the largest lattice energy?2. Which of the following ionic crystals would you expect to have the lowest melting point?3. Which of the following compounds would you expect to possess a multiple bond?4. A reasonable Lewis structure for the molecule CH2O isA. B. C. D. E. 5. What is a reasonable Lewis structure for cyanogen, C2N2?6. Nitrogen–nitrogen bond lengths of 1.10, 1.25 and 1.45 Å have been measured for different molecules. Match the molecules N2F2, N2, N2F4with appropriate NN bond length. 1.10 Å1.25 Å1.45 ÅB N2N2F2N2F47. The electronegativities of four elements (L, M, Q, and R) are as follows: L: 1.1 M: 2.1 Q: 2.4 R: 3.5 In which of the following diatomic molecules would the leastpolar bond be expected?8. Which of the following species violates the octet rule?A. GeF4B. TeF4C. BH4D. SO42E. SiH4Supplemental ProblemsCHEM 110 - Spring 201122
Chapter 8 continued 9. Read the following statements: 1. BF3and PF5are examples of violations of the octet rule. 2. BF4and BF3NH3are examples of violations of the octet rule. 3. Expanded valance shells occur most often when the central atom is bonded to a small, electronegative element. 4. The central atoms most capable of having expanded valence shells come from rows 3, 4, and 5 of the periodic table.10. From Lewis structures for SO2and SO32, we can predict that
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