exam3-F00 - Chemistry 12 Exam 3 Form A Nov. 15, 2000 -The...

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1 Chemistry 12 Exam 3 Form A Nov. 15, 2000 ------------------------------------------------------------------------------------------------------- The Lewis structure of acetaminophen is given below. Use this structure to answer the next 2 questions. 1. What hybrid orbitals are used for bonding by the 2 carbon atoms labeled 1 and 2? A. Both use sp 3 hybrid orbitals B. Both use sp 2 hybrid orbitals C. Both use sp hybrid orbitals D. Carbon 1 uses sp 3 hybridization and carbon 2 uses both sp 2 and sp 3 hybrid orbitals E. Carbon 1 uses sp 3 hybrid orbitals and carbon 2 uses sp 2 hybrid orbitals ------------------------------------------------------------------------------------------------------- 2. How many σ bonds are in acetaminophen? A. 12 B. 16 C. 20 D. 24 E. 28 ------------------------------------------------------------------------------------------------------- 3. Which one of the following molecules is expected to use dsp 3 hybrid orbitals when forming covalent bonds? A. AsCl 3 B. BrCl 5 C. SiCl 4 D. XeF 4 E. ICl 3 ------------------------------------------------------------------------------------------------------- 2 4. Which one of the following molecules would be most polar? A. CH 3 Cl B. CH 3 F C. CH 3 Br D. CH 3 I E. CCl 4 ------------------------------------------------------------------------------------------------------- 5. The experimental dipole moment of HBr is 0.79 Debye. The bond length of HBr is known to be 0.151nm (= 1.51Å). What is the partial charge on the bromine atom? A. 1.74 × 10 20 C B. 1.74 × 10 21 C C. 1.74 × 10 19 C D. 1.60 × 10 20 C E. 1.60 × 10 19 C ------------------------------------------------------------------------------------------------------- 6. Which of the following statements about acetylene are true? 1. There are 2 π bonds and 3 σ bonds. 2. The C C H bond angle is 180 ° 3. The molecular orbitals on the C atom are sp 2 hybrid orbitals A. Only the first statement is true. B. Both 1 and 2 are true. C. Both 2 and 3 are true. D. Both 1 and 3 are true. E. All three statements are true. ------------------------------------------------------------------------------------------------------- HC C H
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3 7. Phosgene, a highly toxic gas that was used as a weapon in World War I, was made by combining carbon monoxide with chlorine, Cl 2 . Estimate the enthalpy change for the formation of phosgene. C O 1075 kJ/mol Cl Cl 243 kJ/mol C=O 745 kJ/mol C Cl 330 kJ/mol A. 25.1 kJ B. 2350 kJ C. –243 kJ D. –87 kJ E. 218 kJ ------------------------------------------------------------------------------------------------------- 8. Which of the following molecules obeys the octet rule?
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This note was uploaded on 05/24/2009 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

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exam3-F00 - Chemistry 12 Exam 3 Form A Nov. 15, 2000 -The...

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