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Unformatted text preview: 4th Exam/CH 131-1 03 &1 05 Fall 2607/Dr. N. W. Hoﬂmaﬁ This exam consists of 2 pages and 22 questions @ 5 points each (plus Periodic Table, data sheet, and scratch
paper). Turn in for grading just the Scantron answer sheet and keep this paper with your answers circled to
compare with the key answers which will be emailed to you. Your score will be the percentage score correct
plus 5 points, You may use the Periodic Table for scratch paper. Multiple Choice (5 pts each). Mark the best answer with #2 pencil darkly on the Scantmn sheet! 1. The bond angles in SQ are the same as those in a) CH3“ b) AlH3 c) Cng d) NH),+ e) PH3 2. Which compound below does not have two different types of bond angles between adjacent substituent
atoms? a) X6F4 ASFS C) IF 3 Bl'Clg 6) 3. The electron-domain geometry at sulfur in $0.; is a) linear b) trigonal planar c) tetrahedral d) trigonal bipyramidal e) octahedral
4. The most likely Lea} value for LCl-Xe-Cl in XeCl4 is a) 978° b) 109.50 c) 1800" d) 900° e) 12000 5. How many hybrid orbitals exist in the sp3 hybrid set? a) l b) 2 c) 3 d) 4 e) 5 6. Hybridization at sulfur in :CES: is a) sp b) Sp2 c) sp3 d) sp3d e) sp3 d2 7. Which of the following has the unigue idealized VSEPR electron—domain structure?
a) SeCl4 b) TeF4 c) GeF4 d) SF4 e) SCL; 8. In which species below is deviation from idealized VSEPR electron-domain geometry observed? a) 8H3 b) BF3 c) anionic CH3' (1) Kng e) cationic CHg+ 9. Which binary hydride below of formula EHn should have the largest bond angles (LE-EH)?
a) M13 PH3 C) BH3 e) OH; 10. Which VB hybridization is used for BrFs? a) sp b) sp2 0) sp3 (1) sp3d e) sp3d2 11. Which VB hybridization is used for trigonal bipyramidral geometry?
a) sp b) sp2 c) sp3 d) sp3d e) spB’d2 12, The strategy used by VB theory to assign structures to molecules and ions entails '
a) forming expanded octets whenever possible b) never forming electron-deﬁcient species
c) using pure atomic orbitals to maximize overlap to form the strongest possible ionic bonds d) using pure atomic orbitals to maximize overlap to form the strongest possible covalent bonds e) using hybrid atomic orbitals to maximize overlap to form the strongest possible covalent bonds 13. Which compound below has a zero dipole moment? a) NH3 b) ClFs c) TF5 d) SeCl4 e) Ker 14. Which compound below has the highest dipole moment? a) FsseF b) FsseH c) Fssel d) FsSeCl e) FSSeBr CH 131—103&105, Fall 2007/1511}: Exam (Page 2) 15. The C/C bond in acetylene, HCECH; has which C/C bonding components?
a) 2 6 bonds only b) 2 7t bonds only c) 3 6' bonds only
(1) l 6 bond & 2 7: bonds e) 2 cs bonds & 1 it bond 16. How many carbons in H2C=CH~CH=C=CH2 have sp hybridization?
a) O b) l c) 2 d) 3 e) 4 17. Using Molecular Orbital theory, which species below exhibit(s) bond order of 0.5?
a) H; b) H; c) HHe‘ d) H; & H; e) H21 H2; & HHe+ 18. Using Molecular Orbital theory and the energy-level diagram for homodiatomics on your data sheet, which
below best describes 0;? a) bond order 2; 2 unpaired electrons b) bond order 2; no unpaired electrons
c) bond order 2.5; l unpaired electron (1) bond order 1.5; l unpaired electron
e) bond order 1.5; 2 unpaired electrons 19. Which technique below is used by Molecular Orbital theory to do smoothly What Valence Bond theory
does clumsily with resonance structures? a) hybridization b) electron delocalization c) normalization d) paramagnetism e) diamagnetism Use the answer set below for Questions 20 ~ 22. 20. Which molecular orbital above depicts 1:21;" bonding?
21. Which molecular orbital above depicts 025* bonding? 22. Which molecular orbital above depicts 62;. bonding? ...
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- Spring '08
- Electron, Chemical bond