Exam 4 - Rockiey, Fall 2011, Chem.1314 Exam #4 Form B. Page...

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Unformatted text preview: Rockiey, Fall 2011, Chem.1314 Exam #4 Form B. Page 2 of 7. 1 . Using bond energies, calculate the heat of reaction in kJ/mol for: C02 + 2 NH3 9 Z HZNCO NH2 + HOH Bond Energies (in kJ/mol): l'l'lUC'DUJZ!> a) B C D E 3. 2 Debyes, what fraction of an electron has been transferred? C=O = 745 C—0 = 358 N-H = 391 N-C = 305 H-O = 467 593 —1 7 -593 -1190 none of these is within 10% of the correct answer if the bond length = 1.26 Angstroms, and the dipole moment = 0.46 .3a _ '§0 [961’ t 21419 ‘ /,§§k’/§ 0.076 g) 37 M 0.166 mg 9/040 0.46 - . 0.54 I: 2 [MM None of these is within 0.10 of the correct fraction 3 O , 07 Q Which of the following gives an incorrect designation of the possible bond angle in degrees for the molecule or ion about the central atom? lTlUOUJZD SClz about 120 IF4 ' 90 and 180 I3 ' 180 FNO about 120 CIF3 90 and 180 Rockley, Fall 2011, Chem.1314 Exam #4 Form B. Page 3 0f 7. 4. Which of the following is false regarding the molecule drawn: /P/ There are 5 unshared pairs of electrons “0 H /B/ There is only 1 pi bond , c 4 ' C The bond angle about Carbon A is 109.5 ° H (a \u o —- N H_ D The bond angle about Nitrogen B is 107 ° ” " \C’ % There are 12 sigma bonds @ 1 \ r A / H. C “ H~ ‘H 5. Which of the following has an incorrect formal charge for the atom specified . = k C A C in 002 O / \ B N in Cl-N—O = 0 fl (3 C Br in Brg = 0 D N in Nitrite ion = O E l in 1c:2 1' = +1 (I is the central atom) 6. Which of the following is an incorrect electron configuration: A Pt = [Xe] 632 5d1 4t14 5d7 B Ag = [Kr] 5s2 4q8 Ba = [Xe] 6s2 /D/ Br = [Ar] 4s2 3d“ 4p5 E N = 1s2 232 2p3 7. of electrons: I'l'lUC7EIJJ> Which of the following incorrectly specifies the number of unshared pairs lF g l SF4 has one unshared pair {(3 fl—S ’33:, lCl4 1' has 2 unshared pairs ’ g ' PF5 has no unshared pairs 1?, C|F3 has no unshared pairs BrF5 has one unshared pair 7 ll ll u? it: 3“” N“ J Rockley, Fall 2011, Chem.1314 Exam #4 Form B. Page 4 of 7. 8. Which is an incorrect hybridization for the central atom in the following molecule or ion: A SiCng (Cl and H’s attached to central Si) = sp2 B 082 (8’3 attached to central C) = sp c lF4 t (F’s attached to central l) = sp3d o PF5 2' (F’s attached to central P) = spadz E PCI3 (Cl’s attached to central P) = sp3 9% it v: S" "" g} ‘ / tea 9. What is the number of sigma and pi bonds in : A 6 sigma 5 pi B- e . . B 8sigma2pi Hat: <- c—rO-"H C 6 sigma 3 pi " D 8 sigma 3 pi c E 6 sigma 2 pi m N I! 10. Which of the following represents the correct order of increasing bond strength: /A/ Br-Br > Cl-Cl > H /B” S-H < S—Br < s-cr C=N < C-N > C-H o N-H < N-S < N-O E as > c=o < c — o 11. Which of the following has the most polar bond: A 38 B F2 0 PF3 o 3ch E RbCl Rockley, Fall 2011, Chem.1314 Exam #4 Form B. Page 5 of 7. 12. Which of the following is false A C02 is linear by both molecular and electron domain geometry about C. B NH3 has a trigonal pyramidal molecular shape 0 N02 1' bond angle is within 3 ° to 109.5 0 D PH3 has a tetrahedral electron domain geometry E N20 (N is central atom attached to an N and an O atom) has a linear molecular geometry 13. Which valence electron configuration does not match the group number: A 2s2 2p3 = [II A /B/ 4s13d5 =v1 B )7 432 = II A /a’ 5s24ci10 5p6 =Vlll A ./E' 5314d1° = 18 14. Which of the following correctly states the atom with the highest specified ionization potential: A Li 1“ ionization energy B Mg 2rml ionization energy C C 4th ionization energy D AI 3rd ionization energy E B 4th ionization energy 15. Which of the following is an incorrect designation of atomic size A S<Al B Sb>N C Ca>K D Xe<Te E F<Na Rockley, Fall 2011, Chem.1314 Exam #4 Form B. Page 6 of 7. 16. Which of the following is false AsF4 1' has 2 unshared pairs of electrons BH3 has a trigonal planar geometry SeCl4 has a seesaw molecular geometry 01031" has a bond order of 1.00 CN1' has sp hybridization lTlUOUJ> (7573; he ~ s >2 4.; 1" 17. What is the bond order in N021' A 0.33 4 l’ B 0.5 [9,, _. / _~ -— c 1.0 A “r rQ m/l/WO‘ o 1.33 (z, E 1.5 s 3» la” {2’ 3' ,(v/ ,__4 /‘/ 18. Which of the following molecular shapes is incorrect? Clo2 1' = bent SF4 = see saw Ker = linear PF3 = square pyramidal |F4 1' = square planar mUOUU> Rockley, Fall 2011, Chem.1314 Exam #4 Form B. Page 7 of 7. 19. What is the hybridization of N in N02 1' A sp B sp2 C 3p3 D sp4 E $de 20. Which of the following is a correct electron configuration: Mo 1* = [Kr] 532 4d3 Si 4' = [Ar] 352 3p6 Al 3+ = [Ne] 3s2 3p4 Sc2+ = [Ar] sci1 F1' = 183 232 2p6 [TIUOUJZD ...
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This note was uploaded on 01/08/2012 for the course CHEM 1314 taught by Professor Gelder during the Fall '07 term at Oklahoma State.

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Exam 4 - Rockiey, Fall 2011, Chem.1314 Exam #4 Form B. Page...

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