Chem_2009_fal_exam1_key

Chem_2009_fal_exam1_key - "Name ~ 7 ' 00012' Part A....

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Unformatted text preview: "Name ~ 7 ' 00012' Part A. Basic Questions. Answer T W0 Of the following three questions. On the first page of the exam” circle which two questions you want graded. ‘ ' ' h 1. (15 pts. total) Arrange the following atoms, ions, or compounds in the order indicated. a. (3 pts.) In order of increasing ionization energy: F, Cs,‘Li Cs A r L :3 r— Lowest IE. -> I Highest I.E. ‘ b. (3 'pts.) From smallest to largest: _ ' I As, Bi, Kr- K V . Ar: ’3 c‘ Smallest ’ ‘ ~ 9 Largest c. (3 pts.) In order of increasing magnitude cf electron affinity: P, S, F Smallest magnitude IE.A. _. 9 ' Largest magnitude EA. (1. (3 pts.) From smallest to largest: ‘ Ti“, P3', Cl' ' 7}: C‘ T (/6 ‘ )0 Smallest 9 V _ ’ Largest ‘ e. (3 pts.) In order of increasing electronegativity: - , ‘ . Sr, In, I g r /"\ J. . Least electronegative 9- Most electronegative 2. (15' pts. total) Answer the following'questions about the element Tc. a.‘(4 pts.) Write the electron configuration far To using the noble gas shorthand. £va 55140! [@3449 gS I - ' b. (4 pts.) Specify n and f quantum numbers of 'of the valence electrons of Tc.‘ 5 $2 1 [A 1 Q I :- 0 c. (4 pts.) Is Tc3lkpararnagnetic? Yes ' d. (3 pts.) Is T054 larger or smaller than Mn“? L/HQ 6 CIR Name 00599 3. (15 pts. total) Answer the following questions about the linear molecule OCS. a) (5 pts.) Draw a valid Lewis dot structure including all lone pairs. :O=C:: b) (5 pts.) The longest bond in OCS is: C = S} (a R C 9 I C -S 430%) c) (5 pts.) The strongest bond in OCS is: C : C o ‘1 cot C "° 5"”) Name 00599 Part B. Competency Questions. Answer THREE of the following four questions. On the first page of the exam circle which three questions you want graded. 4. (17 pts. total) Answer the following three questions about the negatively charged SNO' anion. a. (6 pts.) Draw tw_o possible valid Lewis dot structures SNO' anion with S—N-O bond connectivity. O O . n a W.- ' \ s '1 .‘S.,/ .0- -.I —I o u‘ b. (6 pts.) Label the formal charge on each atom in both of the structures from Part (a). SEE A—Bave c. (5 pts.) Based on the [7651 Lewis dot structure, does S or 0 form a double bond to N? Briefly explain. 9:” 0 mes rower: ELECTJZoA/ec 4-le rv TH/HV s, yea/Prth: arm-Ree 0M 0 S. (17 pts. total) Two isomers with the formula C3H5 are reacted with Brz. Only one isomer reacts with Br; to give a single product. Identify the starting materials and the product. Briefly explain why only one isomer reacts. a_. (6 pts.) Starting materials H H H (PROf'éA/e‘) I ‘C / (C Y( to free 1941/6) Hm/C\ / H LL / \ H I ;\H C —-- C, h I I H 11 H b. (5 pts.) Brominated product Br 9r H I ' t H.. C —-n C —- c; -H ( ( l H H H c. (6 pts.) Brief explanation of why only one isomer reacts. 3r; new? 5 1mm {xx/3.47 wz A-Tep HYDRaC/t-R nous WA A-oorrru/ OA/Ly PR0 PEA/6’ 1s VWS/FTVMTE'D Name W 00599 6. (17 pts. total) This question is about the solid state structure of the element Cs. The atomic radius of Cs is 266 pm (1 pm = 10'12 m). a. (5 pts.) Draw the atomic packing of one face of a face centered cubic (f.c.c.) unit cell in the box below. a (Fan 9447.») b. (5 pts.) How many atoms are in the three dimensional f.c.c. unit cell? [1. c. ( 5 pts.) Calculate the density of Cs from the formula: density = (mass)/(volume) I‘M/PCS 24/970106 x Igz’qogg :: 8,827S’xla—zz; (_ o 2 2].: (o '- ’ATaMs/v-aot y\/ : «3' DIMoMc4= 44"“ :I/zla =0 0:: Valrzs ---22 V: Ema-$3 = 83/1(7.chzo“h)3: 4. 2a"? 3.9.5: 9.20.40 c..a 3 /_ 8.83x/O'ZZ$ 1 2.0? 3 4'3fo [0—1 ICE? Name 7. (17 pts. total) Answer the following questions about the element vanaditim (V), which has a first ionization energy LE. = 650 kJ/mol. a. (5 pts.) Write a chemical equation corresponding to the first ionization of energy of V. Vc 3) “'9 \C/a) 1" b. (6 pts.) Light can be used to ionize an element. What wavelength of light is required to singly ionize V? 3 ,- 57 E: inV: bf E: 33331:: - (firm 3/“ :Ifisuo‘igll _C: 7L’ (Move ' 6.02{x:02‘3/+70Ms/M0«e HA“ “'4 A__ (.62xloh3933x3uoghv /s _7 ” "4”" “M ’3‘“ c. (3 pts.) Write the electron configuration of V+. E (82522,, ‘3 s? a, 45’ see 3 b. (3 pts.) How many valence electrons does V+ have? 4. 00599 Name W 00599 Part C. Mastery Questions. Answer ONE of the following two questions. On the first page of the exam circle the question you want graded. 8. (19 pts. total) Answer the following questions about models for the atom. a. (3 pts.) The Bohr model predicts that an electron with a principle quantum number n = 1 has a velocity of 1.0 x106 m/s. Calculate the wavelength of the electron that the Bohr model predicts for n = l. (The mass ofthe electron is 9.11 * 10 1 kg.) 6,52‘KIO‘34 35 7 {Ix/O‘gjéelo‘m/s __ a : 7.27kl0 (0101: 7.2 Z5757,“ 3 b. (4 pts.) The Bohr model predicts that the electrons orbit around the nucleus at a distance ' of r = 0.52913. Use your answer from Part (a) to disprove the Bohr model for the atom. THE V/FVELQA/GT’H (127/? )OF THE ELECTIZOM {s MOCN Lat-126 6'12 THA-V THE Bar-{R RMIU; c. (3 pts.) What is the principle quantum number n of this wavefunction given that f : 0‘? F3 ‘P(r) Radius (r) d. (5 pts.) Draw the probability (P(r) = r2|w(r)f2) of finding the electron as a function of the radius. r2w(r)2[ : Radius (r) (This problem continues on the next page) 6 Name 00599 e. (2 pts.) How many electrons can fit in this atomic orbital? Answer in three words or less. Ila/O f. (2 pts.) Draw two of the 3d atomic orbitals. Z z flA/y TIA/'0 VAL—up 0/-— 00307ch (5.6,) 562-? 500K) Name 00599 9. (19 pts. total) Answer the following questions related to the Zinc/Iodine Lab. a. (3 pts.) List the chemical formulae of the reactants that you mixed together; and formula of the reaction product. b. (3 pts.) For each chemical listed in part (a), identify the class of solids to which it belongs. M 6' Tit-i. AAOLécaL 4-12 So C. (D I op ( c. s o a r o c. (3 pts.) List three properties typical of ionic solids. some : INSOL'W'O'Z a FTGysocuBC/C? (IV H30 H4120 CM 69' Ccé/H/ED HIGH/M.R/ HIGH IJ'. d. (2 pts.) Which of the reactants and products will become volatile upon heating? Briefly explain in terms of the types of bonding in this compound? 32 19 ALA/106650092 soesrmuce,wmcrr H295 Ofl/L‘f W544"? [MTG-72M 0L ecoeén Fa flags. e. (4 pts.) The first and second ionization energies (I.E.) for zinc are: I.E.1 = 906.4 kJ/mol I.E.2 = 1733.3 kJ/mol Explain this trend. ’TTA'KES A UTA/tom? caves/2&7 To RFAol/é‘ "rt-re Sean/o écé'C’TQcD/V comm/02:20 TO THE:- FuasT are. THIS IS DUE To 7716‘ EFFECYTVG‘A/VC/LWCHMGG I’l/Cflé’fl'SM/é. (This problem continues on the next page) 8 Name 00599 g. (4 pts) What is the energy difference for the reaction of Zinc and Iodine observed in the lab under the assumption that all reactants and products are atoms or ions in the gas phase. The electron affinity of iodine is: EA. = -295 kJ/mol. RKM: _ i- —- 2%3) + ZIYJ) a 2:672" ‘3" '2‘" ._ 2M5, —~'> 2”?) 1-269) 45:q0(,4£'§ fines/glazamactr .- m "not W 2 (¢%)+e173 —-) $6?) ) Aha—263g?) : 4704,: M m Ac: ; ,0: Tom/c 2639-7 ._ 5‘9: «6:5 I '2‘, 4:7} 3 W a ...
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This note was uploaded on 11/18/2009 for the course CHEM 109 taught by Professor Keutsch during the Spring '07 term at Wisconsin.

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Chem_2009_fal_exam1_key - "Name ~ 7 ' 00012' Part A....

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