Self Assessment_Ochem I

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UTID: 2013 Objective Test Section Identify the choice that best completes the statement or answers the question. There is only one correct answer; please carefully bubble your choice on the scantron sheet. Self Assessment_Ochem I 1. How many electrons can the shell with a principal quantum number of 1 hold? c. 4 2. How many electrons can the shell with a principal quantum number of 2 hold? c. 4 3. What is the ground-state electronic configuration of a nitrogen atom (nitrogen: atomic number 7)? s 2 2s 1 2p 4 b. 1s 2 2s 2 2p 3 c. 1s 1 2s 1 2p 5 d. 1s 2 2s 2 2p 2 4. What is the ground-state electronic configuration of a fluorine atom (fluorine: atomic number 9)? s 1 2s 1 2p 7 b. 1s 2 2s 2 2p 5 c. 1s 2 2s 2 2p 6 d. 1s 0 2s 2 2p 7 5. What is the ground-state electronic configuration of a fluoride anion (fluorine: atomic number 9)? s 2 2s 2 2p 2 b. 1s 2 2s 2 2p 5 c. 1s 2 2s 2 2p 6 d. 1s 2 2s 2 2p 7 6. What is the ground-state electronic configuration of a sodium cation (sodium: atomic number 11)? s 2 2s 2 2p 6 3s 1 b. 1s 2 2s 2 2p 5 3s 1 c. 1s 2 2s 2 2p 6 d. 1s 2 2s 2 2p 6 3s 2 7. Which of the following species has an atom that has an unfilled valence shell of electrons? a. molecular hydrogen, H 2 b. hydroxide anion, HO c. boron trifluoride, BF 3 d. water, H 2 O 7

8. Which of the following species has an atom that has an unfilled valence shell of electrons? a. molecular bromine, Br 2 b. fluoride anion, F c. ammonia, NH 3 d. aluminum trichloride, AlCl 3 9. Which of the following species possesses a formal charge? a. CCl 4 b. SiCl 4 c. AlCl 4 d. PCl 3 10. Which of the following is trigonal planar? a. boron trifluoride, BF 3 b. methyl anion, CH 3 c. methane, CH 4 d. ammonia, NH 3 11. Which of the following molecules is not linear? a. H 2 O b. CO 2 c. HC CH d. Cl 2 12. What is the approximate value of the H C H bond angles in methane, CH 4? a. 90 b. 109 c. 120 d. 180 13. What is the approximate H C O bond angle in formaldehyde, H 2 C=O? a. 90 b. 109 c. 120 d. 180 14. Which of the following elements has the highest electronegativity? a. N b. C c. O d. S 15. Which of the following elements has the highest electronegativity? a. C b. P c. Si d. Cl 2

16. Which of the following bonds is the most polar? a. F F b. H F c. C H d. C Si 17. Which of the following bonds is the most polar? a. O H b. C H c. C C d. H H 18. Which of the following is a polar covalent bond? a. Na F b. C H c. C O d. Cl Cl 19. Which of the following is a polar covalent bond? a. Na Cl b. C Cl c. C H d. Cl Cl 20. Which of the following is an ionic bond? a. Br Br b. C Cl c. C S d. Na O 21. Which of the following is an ionic bond? a. F F b. C H c. Li O d. C N 22. Which of the following bonds has the smallest dipole moment? a. C N b. C O c. C F d. O H 23. Which of the following bonds has the smallest dipole moment? a. Li Cl b. C H c. O H d. H Cl 3

24. Which of the following molecules has a molecular dipole? 25. Which of the following molecules has a molecular dipole? 26. Which of the following molecules has a molecular dipole? a. CO 2 b. BF 3 c. NH 3 d. CH 4 27. Which of the following molecules has a molecular dipole? a. H 2 O b. CO 2 c. HC CH d. Cl 2 28. Which of the following best represents the shape of the 2s atomic orbital of carbon? 4

29. Which of the following best represents the shape of a 2p atomic orbital of carbon? 30. Which of the following best represents an sp 3 hybridized atomic orbital containing the lone pair of electrons of ammonia, NH 3? 31. Which of the following statements is not true regarding resonance structures? a. All resonance structures must have the same number of electrons b. Each atom in all of the resonance structures must have a complete shell of valence electrons c. All resonance structures must have the same arrangement of atoms d. All resonance structures must be valid Lewis structures 32. Which of the following statements is not true regarding resonance structures? a. Each resonance structure is in rapid equilibrium with all of the other structures b. The resonance structures may have different energies c. All resonance structures must have the same arrangement of atoms d. All resonance structures must have the same number of electrons 33. Which of the following statements is not true about the carbonate anion, CO 2 3? a. All of the oxygen atoms bear the same amount of charge b. All of the carbon-oxygen bonds are the same length c. The carbon atom bears the negative charge d. It is basic 34. Which of the following statements is not true about the acetate anion, CH 3 CO 2? a. The oxygen atoms bear the same amount of charge b. The two carbon-oxygen bonds are the same length c. The carbon atom bears the negative charge d. It is basic 5

35. How many electrons are there in the valence shell of the carbon atom of a methyl cation, CH 3+? a. 4 b. 5 c. 6 d. 7 36. How many electrons are there in the valence shell of the carbon atom of the methyl anion, CH 3? a. 2 b. 4 c. 6 37. How many electrons are there in the valence shell of the oxygen atom of water? a. 2 b. 4 c. 6 38. How many electrons are there in the valence shell of the nitrogen atom of ammonia? a. 4 b. 5 c. 6 39. Which of the following shows curved arrows that correctly accounts for the differences between the two structures? 6

40. Which of the following is/are tetrahedral? 1. methane, CH 4 2. methyl carbocation, CH + 3 3. methyl carbanion, CH 3 4. methyl radical, CH 3 a. only 1 and 2 b. only 1 and 3 c. only 1 and 4 d. only 2 and 3 7

Self Assessment_Ochem I Answer Section MULTIPLE CHOICE 1. ANS: B PTS: 0 2. ANS: D PTS: 0 3. ANS: B PTS: 0 4. ANS: B PTS: 0 5. ANS: C PTS: 0 6. ANS: C PTS: 0 7. ANS: C PTS: 0 8. ANS: D PTS: 0 9. ANS: C PTS: 0 10. ANS: A PTS: 0 11. ANS: A PTS: 0 12. ANS: B PTS: 0 13. ANS: C PTS: 0 14. ANS: C PTS: 0 15. ANS: D PTS: 0 16. ANS: B PTS: 0 17. ANS: A PTS: 0 18. ANS: C PTS: 0 19. ANS: B PTS: 0 20. ANS: D PTS: 0 21. ANS: C PTS: 0 22. ANS: A PTS: 0 23. ANS: B PTS: 0 24. ANS: B PTS: 0 25. ANS: B PTS: 0 26. ANS: C PTS: 0 27. ANS: A PTS: 0 28. ANS: A PTS: 0 29. ANS: B PTS: 0 30. ANS: C PTS: 0 31. ANS: B PTS: 0 32. ANS: A PTS: 0 33. ANS: C PTS: 0 34. ANS: C PTS: 0 35. ANS: C PTS: 0 36. ANS: D PTS: 0 37. ANS: D PTS: 0 38. ANS: D PTS: 0 39. ANS: C PTS: 0 40. ANS: B PTS: 0 1

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