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chm2045 exam 2 fall05 key

chm2045 exam 2 fall05 key - 'fiactrfl‘i'r3065 Please...

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Unformatted text preview: 'fiactrfl‘i'r3065 Please bubble in-A- as the Toot-Form Gods sit—the top right ofyour answer sheet. Failure to ._doihis .millnesultjn a. penalty of. 10 points. 1. 'The following electron transition for the -H-atom which emits the lowest energy photon is (1) r; i—r n": 2 ="T'_:"_f2)"o—;33512—2' ' (3) n = 5 —> n, = 1 (4) n=2—+n=8 i5In=6r—>n=5. ‘2'. jWhIEfiLth‘gjollowing atomsh'asjthe highest—second ionization energy? '(fi‘Rb Vii) (5) "so (4) Ca (5) Sr. 3. The longest wavelength of light which can photo—dissociate CO molecules into C and O atoms -(1)—1—12nm ' . (.3). 74.0 nm'. (ii) 318nm (5) 93.5 nm. '4:—Ttre—mmber—of‘bond angles—which-mnet-be‘at-ieast slightly different that is shown by a molecule of PF4Br with Br occupying an equatorial position is (1) two (2) three (3435' (4) seven (5) six. . If an H atom electron in n, = 6 emits a photon with a frequency of 7.31 x 10’: s“, the energy level to which the electron moves is - '(i)'n=1 (ma—.2. (3)n=3 (4)n=4 (5)n=7. . Which of the following molecules has the smallest bond angle? (1) CF4 ' ClFs OFg NF3 XBFQ. _. The following series for which the indicated atoms are correctly ordered by increasing atomic .rhdjusis . .W.‘__. . .__ . .. ., - .__. .. . ._ . .... . (1)O<S<Se<As [2)0<S<As<Se (3)As<Se<S<O (4) Se<Asé§<U (5)S<As<0<Se. - Which of .the__f2_112Wi_l}s_9191£9“183 has. the ehsrtest sweetie? CWtPiFBPHd? (1) H§CCN (2) H30N0 _ (a) H30NH2 .(4)~HgCNOH (5) HgCNH. . Select the following species which is planar. (1) 0013- (2) BrF4+ (3) Xe04 (4) Cl;XeBr2 (5) soar. ._gteahflstjflmhflrfilelJpBiEdfiWS is (2)4492; (3) Ni“ (4) Ni (5) Ni“- 11. Which of the following s‘tate'ments' about atomic structure and quantum theory is incorrect? (1} The maximum number of electrons for n = 3 is 18 (2) The number of orbitals in an 3‘ sublevel is 7 [3) For n =4, the largest value for l is 3 (4) For n =4, the largest value for m; is 2 - (5) Wombats two electrons with opposite spins. ' . Select the least polar bond. (1) N—Cl (2) N-O (3) O-F (4) l3=0 (5) S-Cl._ . Which of the -f0110w-ing shows the indicated atoms in correct order of decreesng electroneg- ativity'? ' (1)'S>As'§'Rb>Ca "' (2) S>'As)Ca>Rb {3) As>S>Rb‘>Ca (4) {is _> S ‘3 Ga Rb (5) NoneW ' . its-predicted by VSEPR theory, the geometry ofClFf is (1) perfectly tetrahedral {2) square pyramidal (3) square planar (4) octahedral (5} see-saw shaped. ' . Based on apprbpnate LEWis‘strfiEtureanalysis; the 'N-Eo-‘O bond order for N02 "is (1) 1,!2 (2) 1 (3} 4m (4) 3,:2 (5) 2. ' . Select the correct set of quantum numbers (n, l, rm, ms) for the first electron loston forming a. cationfirom Sr.__ I (3) 5:1), ififé \ (4) 5,1,1,1,!2 (25 5, 1, 0, 1X2 . Based on average bond enthalpies (see “potentially useful information" sheet), AH, for the formation of two moles of NH3 from the component elements is closest to (1) —969 Id (2) 2041s (3} —so.o M (4) 595M {5) —204 kJ. . The formal charge on the central atom in 03 that is shown by acceptable Lewis structure analfiis is”... . __ . . (1). =1... (2).:2 ..._,£314_,_..L4)i1...fi..(5l_..+2=.. . Which of the following molecules has a non-zero dipole moment? (1)—Ken (2)"Xe04 (31-3er (4) cs2 (5) A3015. 20. Basedonvalence b.ond_theory,, what are the hybrid orbitals used bthhe central atom in the POL;+ cation? (1)3123!!!2 (2)8190! (m (4) 8:0 (5) 813’- ...
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