A tetrahedral b trigonal pyramidal c see saw d

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(A) tetrahedral (B) trigonal pyramidal (C) see-saw (D) octahedral (E) square planar (3 pts) 3. If element X is fluorine and structure #1 is a neutral molecule, which of the following would be a possible identity for element A? (A) C (B) Si (C) P (D) N (E) S (3 pts) 4. What is the expected value for the Y–E–Y bond angle in Structure #2? (A) 60 ° (B) 90 ° (C) 109.5 ° (D) 120 ° (E) 180 ° X A X X X E Y Y Y Y Structure #1 Structure #2
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NAME:_________________________________ © 2018 L.S. Brown A3 Consider the Lewis structures below and assume that each one is drawn correctly. Structure A Structure B Structure C (3 pts) 5. How many of these structures would also have one or more additional resonance forms? (A) 3 (B) 2 (C) 1 (D) 0 (3 pts) 6. What type of orbital hybridization is required for the sulfur NITROGEN atom in structure A? (A) s (B) p (C) sp (D) sp 2 (E) sp 3 (3 pts) 7. How many pi bonds are present in structure C? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4 (3 pts) 8. How many sigma bonds are present in structure C? (A) 2 (B) 6 (C) 8 (D) 9 (E) 10 (3 pts) 9. What is the expected value for the O–C–F bond angle in Structure B? (A) 109.5 ° (B) 90 ° (C) 60 ° (D) 180 ° (E) 120 ° N O O C O F F O C O C H H C O O
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A4 © 2018 L.S. Brown The band diagram for a solid material is shown below. (3 pts) 10. What type of material does this diagram represent? (A) insulator (B) intrinsic semiconductor (C) p-type semiconductor (D) n-type semiconductor (E) superconductor (3 pts) 11. Which of the materials below might give rise to the band diagram above? (A) Ge doped with Ga (B) Si doped with P (C) Si (D) Si doped with Ge (E) Si doped with Al For questions 12 & 13, choose the option that best fills in the blank(s) in the statement. (3 pts) 12. In this diagram, the white block at the top represents _________________ and is referred to as the ____________________. (A) empty orbitals, valence band (B) occupied orbitals, conduction band (C) empty orbitals, conduction band (D) occupied orbitals, valence band (E) empty orbitals, band gap (3 pts) 13. The band gap in this diagram is _________________ than the band gap that would be seen for a metal. (A) larger than (B) smaller than (C) the same as E
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NAME:_________________________________ © 2018 L.S. Brown A5 (4 pts) 14. Consider the evaporation of liquid methanol: CH 3 OH( !
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  • Fall '07
  • GENERALCHEMFORENG
  • Chemistry, pts, Dr. Larry Brown, L.S. Brown

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