chm 2045 final fall05 key

chm 2045 final fall05 key - CHM 2045 FINAL EXAM FORMA Dec....

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Unformatted text preview: CHM 2045 FINAL EXAM FORMA Dec. 10,2005 Please bubble in A as the test Form Code at the top right of your answer sheet. Failure to do this will result in a penalty of 10 points. ‘ ' 1. The volume of sulfur dioxide gas measured at 4.00 atm, 51°C, that can be produced by burning 1.00 kg of sulfur in air is closest to ' -: (1) 32.6L (2) 699L (3) 414L (4) 207L (5) 830 L. 2. If the radioactive isotope tritium decays with a first-order rate constant of 0.056/year, what fraction of the tritium which was initially present in a sample will remain in the sample after decaying for 30 years? (1) 0.19 (2) 0.60 (3) 0.12 (4) 2.8 x 10'38 (5) 1.5 $< 10“). fl 3. Which of the following listed species has the greatest number of unpaired electrons in its ground-state electron configuration? (1) P (2) Cr3+ (3) 33- (4) 003+ (5) V2+. ‘ 4. Based on VSEPR theory, what is the shape of XeOng? 1 l 2 3 'd l 4 t t ah dr 1 ( ) square p anar ( ) see-saw ( ) square pyrami a ( ) e r e a (5) octahedral. 5. If the reaction, 2 A + B —) C; proceeds by the mechanism: A + B F‘— D (fast); (ii) D + B ——-) E (slow); E + A —) C + B (fast); a rate law consistent with this mechanism is W (2) rate = klAHB] '(3) rate = klAPIB] (4) rate = HA] (5) rate = k[A]/[B]2. 1'6. Based on ideal behavior, which of the following aqueous solutions has the highest freezing point? (1) 0.28 M Cle22011 2) 0.12 M RbCl (3) 0.090 M Na2SO4 (4) 0.14 M KBr (5) 0.070 M AI(N03)3. 7. Based on average bond enthalpies (see Information Sheet), AHr for burning one'mole of CzH4 in air to give the expected products is closest to (1) 784 kJ/mol (2) 1908 kJ/mol (3) -2065 kJ/mol (4) —1291 kJ‘mol (5) -943 kJ/mol. 8. Which of the following species has the smallest bond angle? (1) CH2BI‘2 SiH4 (3) O3 N03" (5) BIF2-. 9. Select the following sequence which lists the indicated compounds in correct order of decreasing heat of fusion. (1) A1203 > SiBI‘4 < RbCl (2) RbCl > SlBI‘4 < A1203 (3) A1203 > RbCl < SlBI‘4 - - W (4) SlBl‘4 > A1203 < RbCl (5) RbCl > A1203 < S1Br4. 10. A gas mixture consists of equal masses of methane, CH4 (molar mass = 16.0 g/mol), and argon. If, in this mixture, the partial pressure of methane is 500 Torr, the partial pressure of argon is (1) 80.0 Torr (2) 500 Torr (3) 256 Torr (4) 556 Torr (5) 200 Torr. 11. If blood serum, sweat, and tears are each about 0.15 M in dissolved NaCl, the estimated osmotic pressure for each of these solutions at 37°C is closest to (1) 7.§ atm (2) 1.8 atm (3) 0.91 atm (4) 4.8 atm (5) 11atm. 12. How many acceptable resonance structures can be drawn for the carbonate ion? (1) 1 (2) 4 (3) 3 (4) 5 (5) .1 13. For IFz‘, 1013, and Ast", the respective central-atom hybrid orbitals are (1) spad, 8113012, WW (2) 3p. 3102, spad (3) SP2. SP3. spad (4) SP3, spadz, 8113612 (5) 323di 3234' £33? . 14. Which of the following molecules does not have a dipole moment?‘ (1) H28 (2) H200F2 (3) 032 (4) CHZO (5) PH3. “ - 15. For one mole of C2H8N2 reacting with N204 to produce nitrogen, carbon dioxide, and water, the sum of all coefficients in the balanced reaction is (1)11 (2)8 3 12 (4)10 (5)14. 16. If 90.0 mL of 0.20 M NaCl is mixed With 60.0 mL of 0.15 M CaClz to give 150.0 mL of solution, [01‘] in this solution is (1) 0.24M (2) 0.14M (3) 0.35M (4) 0.17M (5) 0.27 M. 17. If a reaction with an activation energy of 195.0 kJ/mol is heated from 200.0°C to 220.0°C, the rate constant, k, for this reaction will increase by a factor closest to (1)1.1 (2 7.5 (3) 2.0 (4) 3.2 (5) 4.3x104. 18. The attraction forces to be overcome to evaporate liquid acetonitrile, CH3CN(l), are (1) H-bonding (2 di ole-di ole 8: London dipole-induced dipole (4) ion-dipole (5) Lon on on y. 19. For the following solutions, the weakest ion-ion attraction forces are found in 1 1 (2) 0.1 M MgSO4 (3) 2 M NaOH 1 (4) 0.5 M CaClz 5 0.3 M Fer. _ 20. Consider: 3 Mn042' (aq) + 4 H+(aq) ——) 2 MnO4’(aq) + Mn02(s) + 2 H200). If the rate of reaction of Mn042‘ (aq) is 2.0 M / min, the rate of reaction of H+ (aq) is closest to (1) 2.0 M/ ' 2 2.7M ' (3) 1.5 M/ 'n (4) 0.07 M/min (5) 13 ME: U__.Ls.ls ml 21. If NO(g) is made to react with water to produce ammonia and oxygen, the maximum mass of ammonia which can be produced from a reaction mixture of 1.00 mol each of NO and water is closest to (1) 12.5g (22 11.35 (3) 7.7g (4) 18.0g (5) 9.5 g. 22. Select the following listed species which is not planar. (1) SlCl3+ (2) BI'F3 W_ (4) ICle2_ (5) BF3. 23. Imagine that the reaction: 2 N OBr(g) ——) 2 N0(g) + Br; (g), is studied from an initial rate standpoint and has a rate constant, k, with units of L mol"1 3“. Thus, if this reaction has a rate of 1.62 x 10"3 mol L‘1 3’1 when [NOBr] is 0.045 mol/L, the value for k is closest to (1) 17.8 L mol‘1 3‘1 (2) 27.8 L mol"1 3‘1 (3) 1.25 L mol‘1 3“1 (4) 0.0360 L mol‘1 8"1 (5) 0.800 L mol"1 s‘1 . 24. Consider: NH4+(aq) + N02“(aq) ——) N2(g) + 2 H200). Based on the rate data for this reaction on the Information Sheet, what is the reaction rate when [NH4+] = 0.39 M and [NOg‘] = 0.052? (1) 2.3 x 10-5 (2) 2.3 x 10-6 (3) 6.1 x 10-6 (4) 5.4 x 10-7 (5) 1.2 x 10-4. 25. For the following species, covalent bond rupture is most difficult to achieve with 1 NO ' 2) N02+ (3) NO+ (4) NO (5) NO". ( ) 2 ( ’_ ...
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This note was uploaded on 04/24/2008 for the course CHM 2045 taught by Professor Mitchell during the Spring '07 term at University of Florida.

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chm 2045 final fall05 key - CHM 2045 FINAL EXAM FORMA Dec....

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