CHEM 177 FINAL EXAM WEDNESDAY, DECEMBER 12 7:00-9:00 P.M.
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1 PROF. THOMAS J. GREENBOWE DR. KATHY BURKE FALL 007 THIS EXAM CONSISTS OF 7 QUESTIONS ON 7 PAGES CHEM 77 HOUR EXAM III OCTOBER 007 NAME RECIT. INSTR. RECIT. SECT. PARTS Page Page 3 Page 4 Page 5 Page 6 TOTAL GRADING POINTS 8 pts 7 pts pts pts pts 00 pts SCORE NOTE: THE METHOD YOU USE IN SOLVING QUESTIONS MUST BE CLEARLY SHOWN IF YOU ARE TO RECEIVE FULL CREDIT. QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THE LAST PAGE CONTAINS USEFUL INFORMATION AND A PERIODIC TABLE. THIS SHOULD BE REMOVED AND USED FOR ADDITIONAL REFERENCE AND SCRATCH PAPER. DO NOT PUT ANSWERS ON THE TEAR AWAY PAGE. Teaching Assistants and Recitation Sections Name Bernie Anding Cynthia Bunders Shantha Daniel Christopher Ebert Tanya Gupta Emily Hull Zainab Khan Brandon Kobilka Rose Kohl Jason Lupoi Nataliya Markina Emily McDanel Megan Mekoli Derrick Morast Sahana Nagappayya Nicholas Nagle Gerald Pollock Nathan Schulz Justin Valenstein Anthony Young Chad Yuen Sections 6, 9 3 5, 7 3, 7 9, 8, 35 0, 4 0 8, 5 6 4, 5 30, 34 8, 3, 33 7, 9, 6 3 4, 3 Time :00, 3:0 8:00 0:00, :0 9:00, :0 :0, 5:0 :0, 5:0 4:0 9:00, 0:00 :0 :0, :00 :0 8:00 0:00, :00 4:0, 9:00 :0, 4:0 4:0, 5:0 :0, 3:0 8:00 :0, :0 9:00 0:00, :00 The answer key to this exam will be posted on Bulletin Board #5 in the hallway east of Room 00 Gilman and on the Chem 77 website. CHEM 77 FINAL EXAM WEDNESDAY, DECEMBER 7:00-9:00 P.M.
2 PART I Multiple Choice. ( questions at 3 pts each = 66 pts total). To which one of the following reactions occurring at 5 C does the symbol H f o [H SO 4 (l)] refer? a) H(g) + S(g) + 4 O(g) H SO 4 (l) b) H (g) + S(g) + O (g) H SO 4 (l) c) H SO 4 (l) H (g) + S(s) + O (g) d) H SO 4 (l) H(g) + S(s) + 4 O(g) e) H (g) + S(s) + O (g) H SO 4 (l). When magnesium metal is burned in a pure carbon dioxide atmosphere (such as dry ice), carbon and magnesium oxide form. The balanced equation is ΔH f o for CO (g) is kj/mole o Does ΔH rxn Mg(s) + CO (g) MgO(s) + C(s) for this reaction indicate it is endothermic or exothermic? a) endothermic b) exothermic ΔH f o for MgO(s) is 60.6 kj/mole 3. The E of a system that releases.4 J of heat and does 4. J of work on the surroundings is J. a) 6.6 b).4 c) 4. d) -6.6 e) When we watch a fireworks display, the fireworks we see are a result of a) electrons absorbing light energy as they change from a higher to lower energy level. b) electrons emitting light energy as they change from a higher to lower energy level. c) electrons emitting energy as they change from a lower to higher energy level. d) none of these. 5. Of the following, radiation has the longest wavelength and radiation has the greatest energy. gamma ultraviolet visible a) ultraviolet, gamma d) visible, gamma b) visible, ultraviolet e) gamma, visible c) gamma, gamma 6. A possible set of quantum numbers for the last electron added to complete an atom of gallium Ga in its ground state is n l m l m s a) / b) 3 0 -/ c) 4 0 +/ d) 3 - +/ e) 4 - +/
3 3 7. What is the energy in joules of a mole of photons associated with visible light of wavelength 486. nm? a) J b) J c) J d).4 kj e) 46 kj 8. Which element has the greatest metallic character (of the ones listed)? a) Ca b) Mg c) Ba d) As e) Se 9. The orbital diagram for a ground state carbon atom is s s p a) b) c) d) 0. The group of elements that have outer electron configurations ending in ns (where n is the row #) are called? a) transition metals d) alkaline earth metals b) halogens e) noble gases c) alkali metals. Which one of the following is not isoelectronic with Kr? a) As 3+ b) Se c) Rb + d) Sr + e) Br. Which one of those atoms listed below will have the largest radius? a) B b) Ga c) Br d) Si e) Cl 3. Which element will have the smallest ionization energy? a) Li b) Na c) Be d) K e) Rb 4. Which one of the following elements(s) behave chemically similarly to potassium? a) magnesium d) chlorine b) calcium e) iron c) lithium f) beryllium 5. Which of the following is an acidic oxide? a) P 4 O 0 b) MgO c) Fe O 3 d) K O e) Cr O 3
4 6. Which atom most likely forms an ion with charge of +3? a) s s p 6 3s c) s s p 6 3s 3p 6 4s 3d 6 b) s s p 6 3s 3p 6 4s d) s s p 6 3s 3p 6 4s 3d 0 7. Metals tend to react with the halogens to form metal halides. What is the reactivity order for the halogens? a) F > Cl > Br > I c) Br > I > Cl > F b) Cl > F > Br > I d) I > Br > Cl > F 8. The four spheres below represent K +, Ca +, Cl, and S, not necessarily in that order. 4 A, r = 00 pm B, r = 38 pm C, r = 80 pm D, r = 84 pm Which sphere most likely represents the K + ion? a) A b) B c) A or B d) C or D 9. Sodium is much more apt to exist as a cation than is chlorine. This is because a) chlorine is a gas and sodium is a solid. b) chlorine has a greater electron affinity than sodium does. c) chlorine is bigger than sodium. d) chlorine has a lower ionization energy than sodium does. e) chlorine is more metallic than sodium. 0. Which of the following correctly represents the electron affinity of bromine? a) Br(g) Br + (g) + e d) Br (g) + e Br (g) b) Br(g) + e Br (g) e) Br + (g) + e Br(g) c) Br (g) + e Br (g). Alkali metals tend to be more reactive than alkaline earth metals because a) alkali metals have lower densities. b) alkali metals have lower melting points. c) alkali metals have greater electron affinities. d) alkali metals have lower ionization energies. e) alkali metals are not more reactive than alkaline earth metals.. For the fourth-shell orbital shown at the right, what are the principal quantum number, n, and the angular momentum quantum number, l? a) n = 4 and l = 0 c) n = 4 and l = b) n = 4 and l = d) n = 4 and l = 3
5 5 PART II Problems. Show all work. Answers should include appropriate units and contain the correct number of significant figures. (34 pts total) 3. (6 pts) Ethanol undergoes combustion according to the equation C H 5 OH(l) + O (g) CO (g) + H O(l) (not balanced) The standard heat of combustion of ethanol, C H 5 OH(l), is kj/mol. Given that H f o [CO (g)] = kj/mol H f o [H O(l) = kj/mol What is the standard enthalpy of formation of ethanol? 4. (6 pts) Calculate the enthalpy change for the reaction using the following information: C(graph) + H (g) + ½ O (g) CH 3 OH(l) C(graph) + O CO (g) H (g) + ½ O H O(l) CH 3 OH(l) + 3/ O (g) CO (g) + H O(l) H f o = kj H f o = kj H f o = kj
6 5. (6 pts) The combustion of pentane (7.7 g/mole) produces heat according to the equation 6 C 5 H (l) + 8 O (g) 5 CO (g) + 6 H O(l) o H rxn = -3,50 kj How many grams of CO (44.0 g/mole) are produced per,500 kj of heat released? 6. (6 pts) Calculate the wavelength (in nanometers) of the light emitted by a hydrogen atom during a transition of its electron from the n = 4 to n = principal energy level. 7. (0 pts) Complete and balance the following equations. a) CO (s) + H O(l) b) CaO(s) + H O(l) c) Cs(s) + H O(l) d) Mg(s) + H O(g) 00 e) MgO(s) + HCl(aq)
7 7 F = 9 5 ( C) + 3 amu = g Avogadro s Number = E = q + w o "H rxn = #n"h f o (products) $ #m"h f o (reactants) # E = J n " & % ( $ f n i ' " = R $ H n # ' & ); R H = % n (.097 *07 m q = mc T M = (number of moles of solute)/l of solution q lost + q gained = 0 hertz = cycle sec c = E = hυ = hc " m sec or E = hf = hc " h = Joule-sec λυ = c or λf = c A H Li 6.94 Na K Rb Cs Fr (3) A 4 Be 9.0 Mg Ca Sr Ba Ra 6 3B 3 Sc Y La Ac 7 4B 4 Ti Zr 9. 7 Hf Rf (6) 5B 5 3 V Nb Ta 8 05 Db (6) 6B 6 4 Cr Mo W Sg (63) Periodic Table of the Elements 7B 7 5 Mn Tc (98) 75 Re Bh (6) 8 6 Fe Ru 0 76 Os Hs (65) 8B 9 7 Co Rh Ir 9 09 Mt (66) 0 8 Ni Pd Pt 95 0 Ds (8) B 9 Cu Ag Au 97 B 30 Zn Cd 80 Hg 0 3A 3 5 B Al Ga In 5 8 Tl 04 4A 4 6 C.0 4 Si 8. 3 Ge Sn 9 8 Pb 07 5A 5 7 N P As Sb 83 Bi 09 6A 6 8 O S Se Te 8 84 Po (09) 7A 7 9 F Cl Br I 7 85 At (0) 8A 8 He Ne 0. 8 Ar Kr Xe 3 86 Rn () Lanthanides Actinides 58 Ce Th 3 59 Pr 4 9 Pa 3 60 Nd 44 9 U 38 6 Pm (45) 93 Np (37) 6 Sm Pu (44) 63 Eu 5 95 Am (43) 64 Gd Cm (47) 65 Tb Bk (47) 66 Dy 6 98 Cf (5) 67 Ho Es (5) 68 Er Fm (57) 69 Tm 69 0 Md (58) 70 Yb 73 0 No (59) 7 Lu Lr (60)
THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #5 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE CHEM 177 WEBSITE.
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