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UL Lafayette CHEM 107 - Exam 3

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1CHEM 107 (Spring-2004) Exam 3 (102 pts) Name: ------------------------------------------------------------------------, SSN -------------------------------- LAST NAME, First (Circle the alphabet segment of your LAST NAME): A,B C-H I-M N-S T-Z Please answer the following questions: Part I: Multiple Choices (56 pts: 14 @ 4 pts each). Circle the ONE best answer: 1. Consider four identical 1.0 L flasks containing the following gases each at 25 °C and 1 atm pressure. Which gas do the molecules have the greatest average kinetic energy? a) H2 b) O2 c) NH3 d) same for all gases 2. Which of the following equations DO NOT represent an oxidation? a) SO2 SO3 b) Mg Mg2+ c) MnO2Mn2+ d) 2 Br- Br2 3. The oxidation states of chlorine in SO32- and H2S are: a) +4 and -2, respectively b) +6 and –2, respectively c) -4 and +2, respectively d) +2 and –2, respectively 4. Which set of temperature and pressure conditions will cause a gas to exhibit the greatest deviation from the ideal behavior? a) 100 ºC and 4 atm b) 100 ºC and 2 atm c) -100 ºC and 4 atm d) 0 ºC and 4 atm 5. Calculate the wavelength, in meters, of microwave radiation that corresponds to an energy of 2.63 J/mol photons. a) 2.63 b) 4.55 x 10-2 c) 1.14 x 108 d) none of the above 6. Which of the following electromagnetic radiation has the shortest frequency? a) X-ray b) Visible light c) Radio wave d) Infrared 7. Which of the following isoelectronic species would have the smallest radius? a) Mg2+ b) N3- c) O2- d) F-28. The orbital of 2p electrons is often represented as being a) elliptical b) square c) dumbbell shaped d) spherical 9. Which of the following would cause a reduction in the volume of a gas? a) Increasing the number of molecules (constant P& T) b) Decreasing the pressure (constant n & T) c) Decreasing the temperature (constant n & P) d) Increasing the kinetic energy (constant n & P) 10. Which set of quantum numbers is correct and consistent with n = 4? a) ℓ = 2, mℓ = -3, ms = +½ b) ℓ = 4, mℓ = -5, ms = -½ c) ℓ = 3, mℓ = +3, ms = +½ d) ℓ = 3, mℓ = -3, ms = +1 11. An Ag+ ion is a) paramagnetic with two unpaired electrons b) diamagnetic with zero unpaired electrons c) paramagnetic with three unpaired electrons d) paramagnetic with one unpaired electron 12. The ground state electron configuration of iridium, Ir (Z = 77) is a) [Xe] 5d7 6s2 b) [Xe] 4f14 5d7 6s2 c) [Xe] 4f14 5d8 6s1 d) [Xe] 4f14 5d9 13. The maximum number of electrons in the 4d subshell is a) 6 b) 14 c) 2 d) 10 14. The ground state electron configuration of chromium atom, Ni (Z = 28) is a) 1s2 2s2 2p6 3s2 3p6 3d10 b) 1s2 2s2 2p6 3s2 3p6 4s2 3d8 c) 1s2 2s2 2p6 3s2 3p6 3d5 4s2 4p3 d) 1s2 2s2 2p6 3s2 3p6 4s1 3d93Part II. (10 pts) Equations and formulas 1. Balance the following unbalanced redox equation in acidic solution: O2 (g) + Br- (aq) H2O (l) + Br2 (l) Then indicate: a) The oxidation step: ----------------------------------- b) The reduction step: ------------------------------------ c) The oxidizing agent: ------------------------------------ d) Substance that is reduced: ------------------------------------ d) The number of electrons that is transferred per mole of the reducing agent: ----------- ________________________________________________________________________________ Part III. Calculations (36 pts: 3 @ 12 pts each) Show all work for full credit. Please express all answers with the proper units and correct number of significant figures. 1. a) Calculate the wavelength in nanometers in the H-atom spectrum that arises from the electron transition of n = 5 to n = 2. b) In what spectral region does this transition occur? -------------------------------------------------- c) Is energy absorbed or emitted? -------------------------------------------------- d) How many emission lines are possible for the transition from n =5 to lower energy levels? ------- 2. Calculate the density of nitric oxide gas, NO at 27ºC and 700 torr. λ (nm) =4 3. Nitric acid can be prepared by bubbling dinitrogen pentoxide, N2O5 into water. N2O5 (g) + H2O (aq) 2 H+ (aq) + 2 NO3- (aq) (a) How many moles of H+ are obtained when 1.50 L of N2O5 at 25º C and 1.00 atm pressure is bubbled into water? (b) The solution obtained in (a) after reaction is complete has a volume of 437 mL. What is the molarity of the nitric acid obtained? Density of NO = Moles of H+ = Molarity of nitric acid =5 Exam 3 – Spring 2004 You will have 70 minutes to complete this exam. The exam has 4 pages plus the Periodic Table and Reference page. When you are told to do so, tear off the Periodic Table cover sheet and use as required during the exam. 1 1 H 1.01 Periodic Table of the Elements 2 He 4.00 2 3 Li 6.94 4 Be 9.01 5 B 10.816 C 12.01 7 N 14.01 8 O 16.009 F 19.0010 Ne 20.18 3 11 Na 22.99 12 Mg 24.30 13 Al 26.9814 Si 28.08 15 P 30.97 16 S 32.0617 Cl 35.4518 Ar 39.95 4 19 K 39.1 20 Ca 40.08 21 Sc 44.96 22 Ti 47.88 23 V 50.94 24 Cr 52.00 25 Mn54.9426 Fe 55.8527 Co 58.9328 Ni 58.6929 Cu 63.5530 Zn 65.3831 Ga 69.7232 Ge 72.59 33 As 74.92 34 Se 78.9635 Br 79.9036 Kr 83.80 5 37 Rb 85.47 38 Sr 87.62 39 Y 88.91 40 Zr 91.22 41 Nb 92.91 42 Mo 95.94 43 Tc (98) 44 Ru 101.145 Rh 102.946 Pd 106.447 Ag 107.948 Cd 112.449 In 114.850 Sn 118.7 51 Sb 121.8 52 Te 127.653 I 126.954 Xe 131.1 6 55 Cs 132.9 56 Ba 137.3 57 La 138.9 72 Hf 178.5 73 Ta 181.0 74 W 183.8 75 Re 186.276 Os 190.277 Ir 192.278 Pt 195.179 Au 197.080 Hg 200.681 Tl 204.482 Pb 207.2 83 Bi 209.0 84 Po (209) 85 At (210) 86 Rn (222) 7 87 Fr (223) 88 Ra 226.0 89 Ac 227.0 104 Rf (261) 105 Db (262) 106 Sg (263) 107 Bh (262) 108 Hs (265) 109 Mt (266) 110 Uun(269) 111 Uuu(272) 112 Uub(277) 58 Ce 140.1 59 Pr 140.9 60 Nd 144.2 61 Pm(145) 62 Sm 150.463 Eu 152.064 Gd 157.265 Tb 158.966 Dy 162.567 Ho 164.968 Er


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UL Lafayette CHEM 107 - Exam 3

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