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Unformatted text preview: 1 Chem 120 Name_______________________________ Exam 4, Ch 13-14 Lab Section: Wed. Thur. December 8, 2003 Recitation: 1:30 3:30 Please answer all of the questions on the exam. For mathematical problems, show all work and present results with the correct units and to the correct number of significant figures. Multiple Choice: 4 points each, 24 points total. Circle the correct answer. 1. Which of the following elements is most likely to display sp 3 d hybridization? a. oxygen b. nitrogen c. phosphorus d. carbon e. boron 2. How many sigma ( ) bonds are in the following molecule? C C CH 3 C N H H a. 3 b. 6 c. 7 d. 9 e. 12 3. How many sigma ( ) and pi ( ) electron pairs are in a carbon dioxide molecule? a. four and zero b. three and two c. two and two d. two and four e. one and three 4. Which is the most polar bond? a. O - F b. N - F c. C - F d. F - F e. Cl - F 5. In order for an ion or molecule to have square planar geometry, the central atom must be _______________ hybridized. a. sp 3 b. sp 2 c. sp d. sp 3 d e. sp 3 d 2 2 6. Which response contains all the characteristics listed that should apply to BF 3 ? 1. trigonal planar 2. one unshared pair of electrons on B 3. sp 2 hybridized boron atom 4. polar molecule 5. polar bonds a. 2, 4, and 5 b. 1, 3, and 4 c. 1, 2, and 3 d. 1, 3, and 5 e. 3, 4, and 5 Problems: (80 points total) 7. The Lewis structure for thiocyanate ion (SCN- ) could be drawn in one of three ways, as...
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