Chem103F06T3 - Cheml 03F06 Exam 3A Name ‘ Section 1(5...

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Unformatted text preview: Cheml 03F06 Exam 3A Name ‘ Section 1(5 pts) Calculate the deBroglie wavelength for a proton with a speed 5.0% of the speed of light. Mass ofpr'otgg =1'.67 x 10"24 g; h = 6.62 x 10—34 I see - ,___ Lax/04%? ' -xt/ snow f?” MV '3 4? dz", / 3' 5-" J 46/2900 ’ o . 5 WORK xx j%)/Jmpog){flj V _./ ‘ - Answer: .7172 X/9 M II(5 pts) An electron was excited from the ground state to n = 3 in a hydrogen atom. Indicate True or False for each of the following statements. @ .A) It takes more energy to form the H+ ion when the electron is in n. = 3 than from the / ground state. M B) The electron is farther from the nucleus on average in the n = 3; state than in th ground state. ' __£_”g‘_£__ C) The wavelength of light emitted if the electron drops from n = 3 to n = 2 is shorter than the wavelength of light emitted if the electron falls fiom n = 3 to n = l. ff“ D) The wavelength of light emitted when the electron returns to the ground state from n = 3 is the same as the wavelength absorbed when the electron goes from n = 3 to n = 1. E) The first excited state corresponds to n = 3 11184 pts) Place the correct answer in the space at the left. C 1. If the reaction 2A + 3D 9 products is first order in Aland second order in D, then the rate law will have the form: Rate = A) ktAHDl B) mama 0) krArDr ' D) klAllel 13) klf’xlle]2 g 2. The correct units for the rate constant in the rate law: Rate M3) = k[D;[X are: A) mol L" s '1 B) L mol ~[$—1 C) moi?- L‘ s" D) mol L‘ls'2 E) Lzmol'2 s“1 2 5 3. Consider the following reaction and its rate law: A + B 9 C Rate = MA]2 Which of the following will NOT increase the rate of the reaction? A) Increase the concentration of reactant A. B) Increase the concentration of reactant B C) Increase the temperature of the reaction. D) Adding a suitable catalyst. B) All will increase the rate of the reaction Name 2%? 2 Section r - Ld & 4. The energy of a system can ALWAYS be increased by: A L " Q J, . 1|- A) Adding heat to the system __ B) Having the system do work on the surroundings -- __. C) Removing heat from the system r 4. D) adding heat to the system and having the system do work on the surroundings E) Removing heat from the system and having the surroundings do work on the system g 5. Which of the following statements is FALSE. A) Enthalpy is not a state function B) Heat is not a state fimction C) Internal energy is a state function D) At constant pressure AH : Q E) Under most reaction conditions AH is close to AB 2 6. 'Which of the following processes is endothermic? A) 2H2(g) + 02(g) 9 2H20(g) B) H20(g) 9 1120(1) C) CH4(g) + 202(g) 9 COKE) + 2H20(g) D) H20(s) -) H200) E) H20CE) —) H20(S) 7. Which of the following has AH°f equal to zero? A) C02(g) B) BIKE) C) HCKS) D) He(§) E) C(g) / 9 8. Which of the following processes causes a decrease in entropy of the system? A) boiling water to form steam B) dissolving solid KCl in water _C) mixing two gases in one container D) freezing water to form ice E) subliming dry ice same temperature? A) NH3(g) B) N6(g) C)H20(1) D)HC1(g) E)C(S) 10. Dissolving ammonium chloride in water lowers the temperature of the system. For this process: ; 2 A) AH is negative and AS is negative A fl 71' 41-3 + B) AH is positive and AS is positive C) AH is negative and AS is positive D) AH is positive and AS is negative E) unable to determine anything about AH and AS é 9. Which of the following substances has the HIGHEST absolute entropy when all are at the Name g g ’2 Section ( 11. Consider the following reaction: A(g) + B(g) -) C(g); This reaction will ALWAYS be spontaneous when AH is and AS is . A) positive, positive A g g M _ 715 B) negative, negative, _ + C) negative, positive. D) positive, negative : 12. The reaction: C2H5(g) -) C2H4(g) + H2(g) is endothermic. This reaction is: A) spontaneous at all temperatures A”; 7! A 5 ;- 4. B) non Spontaneous at all temperatures ' A J 7,4 5 C) spontaneous at high temperature and non spontaneous at low temperature 4 a A I '- D) non spontaneous at high temperature and spontaneous at low temperature / 13. Which of the following statements is true about the equilibrium constant for a reaction if AG0 for the reaction is greater than zero? A4. 02 ' pig“ k A)K=0 B)K=1 C)K>1 D)K<l 4‘ l0 - : V4 / l 14. Which of the following is NOT a state function? A) AE B) AH C) T D) W E) AG g 15.. Which of the following will NOT effect the rate of the reaction? A) the solvent used B) the temperature of the reactiOn C) the particle size D) the concentration of products E) all- will effect the rate 16. A system that does not exchange energy or matter with the surroundings is A) an open system 'B) a closed system C) an isolated system D) not possible lo 1% 17. A chemical reaction that absorbs heat from the surroundings is said to be: A) exothermic and has a positive sign B) exothermic and has a negative sign C) endothermic and has a positive sign D) endothermic and has a negative sign. 18. Which of the following has the longest wavelength? A) microwave B) infrared C) visible D) ultravioiet E) X —— ray Wing 19. Which of'thefollowing has the highest frequency? A) microwave B) infrared C) visible D) ultraviolet E) X — ray if . Which of the following has the lowest energy? - A) microwave B) infrared C) visible D) ultraviolet E) X — ray Name Section his bib shsbb abhb 21. Which of the following has the lowest frequency? A) green B) blue C) orange D) red E) yellow 22. Which of the following has the shortest wavelength? B) blue C) orange D) red E) yellow A) green 23. Which of the following is not a correct set of quantum numbers? A) (4,3, — 1, - 1/2) B) (3,2,1.+1/2) C) (4,2.- 2,-1/2) D) (2,1 ,1,+1/2) E) (3,3,-3,-I/2) 24. The size of an orbital is designated by the quantum number? A) n B) l C) l'l‘l; D) ms 25. The quantum number that does not describe an orbital is? A A) n B) 1 C) m. D) ms Use the following code to answer questions 26 a» 34 (answers may be used more than once) D) Schrodinger G) Einstein A) Bohr B) Thomson E) de Broglie C) Rutherford F) Planck 26. “plum pudding” atomic model 27. solution of the wave equation let to 3 related quantum numbers 28. electron can only move from one orbit to another 29. introduced the concept of a nuclear atom 30. matter can behave as a wave 31. quantized angular momentum 32. combined the wave and particle nature of an electron 33. energy gained or lost in packets called quanta 34. explained the photoelectric effect. WWOQ 30mm Name 1% Section IV(10 pts) For the reaction : M + 2B -) products the following information was found. Expt [M] [B] - d[M]/dt in W5 1 0.23 0.17 0.33 2 0.46 0.17 2.64 3 r 0.23 0.51 0.33 For the rate law: - (1le m kM’TBY dt A) Determine the value for x X fig/3 ; 2w: (. r44) Fey! 9,33 (an) e X - .E {'3 Answer 3 B) Determine the value for y E3 ; a. 33_ mu '31 $4,021 a ;3 “VI /.7 _‘ g :3 0 Answer 0 / - (3) ‘3 C) What is the overall order of the reaction? X a! 3 Answer J D) What is the value for k in the rate law? egg/7,. f («13531 D W a 32’ 5 if" 4-“: %:22./ z; 0 ' 33 3 1% (“13) 23) Answer gag—“1216.5 E) What is the rate of disappearance ofB when [M] = 0.46 M and [B] = 0.17 M? [Mar 32/”! 2 M2545M7=Mcé [31:04? F/W 545ij“4‘45? Jan: f; $0533 _____——~. ,flflmlh- L/ V, 2.5 Answer J? 2.? W1: M a w -m: 6 4,52%; 3,252.44: 422.? Name 4 é £2 Section V(5 pts) What is the value for ME for a system which performs 213 id of work on the surroundings and loses 79 Id of heat? If; ; € 15d!“ SHOW 4E3 @27L“) a}; -2/3/(r 'WORK .2—244 _2/3 Answer ’Jf"? / SHOW VI(5 pts) For the reaction: H2(g) + Br2(g) 9 2HBr(g), AH° = — 72 kJ of heat. How much heat is released when 113 g of HBr is produced? H = 1.01, Br = 79.9 WORK //.?{7,é/Zv Lyra/£7 alfljfééMM/é/w yaw/5 I "g/+L—a———2kf ’Jizzm'f’y’gr 2 ".52u7flkr Answer “‘52 JMMM» ' VII(5 pts) Write the formation reaction for the cobalt compound: HCo(PF3)4(1) 5/74! *g(s)*y;>a%é/;C —;~/—/(2 Pf) M) VIII(7 pts) Given the following information: Reaction - AHDm (kl/r1101) CH3COOHU) + H200) —) C2H50H(l) + 02(g + 492.6 Czl'l4(g) + H200) 9 C2HSOH(1) - + 45.0 H2(g) + 1/2 02(g) —) H200) - - 285.8 kJ 20(s graph) + 2 H2(g) 9 CzH4(g) + 52.3 Find AH°f for acetic acidi A) Write the TARGET REACTION , 16a). %4( +2{/,/, a €4,6M// } i B) Show 0 caloulatio 3 W49) 4 4 9-) -—~r C7,; (@014 gig/46V;- 6/ £7- 4 Cyfigl’Jéaa-e // m ‘9’“ A03 X8cs)flszgg) ——> QJfiéffl ‘ __d___ a jfls‘ko’ /&J)W¢g;é [5) a, C/zéZ’WA/p) Answer _ fl yr SHOW WORK 7175105? gomm Name 4 Section IX(10 pts) Given the following data: Compmmd AH°f (kJ/rnol) AG"; (kJ/mol) So (J/K) H200) - 286 - 237 70 H20(g) - 242 — 228 189 N0(g) + 90 +87 N02(g) + 34 1 +52 240 HN03(aq) - 207 - 111 146 NH3(g) — 46 - 17 193 For the reaction: 3N02(g) + H200) a .2 HNO3(aq) + N0(g) at 25°C: _ A) Calculate AH" for the reaction 4/J02 sax/g M, f 521/4; my, Poms? W] - £3 (was/J, {261 [Zr/409% (2%)] — [3 (23 90+ [~ 29%)1 Answer w B) AG" for the reaction is m 54 kJ/mol. Calculate ASo for the reaction #ngC K U 6 A Q U?— 4 24/ - TA 5 0 WW; - M ., (2a) 645) % sea/fay 2%“ WM .- 0 Answer “07% “J 50 .2 Papfcf-{ASO A52rflt2cf'?kr C) Calculate S0 for N0(g) 4502 jsfgmfl" iguflm‘j -OQHJ” 2' [ham/05);- ,udl *- £3002) l- . W fl,20§’/C\T emsrzom N01 ' [3(2‘60’7‘ M Answer WW “AH = a? sz - £20 ~90 M92290? D) Calculate E° for the reaction (R = 8.314 J/mol K) (Assume volume change of I‘INO3 and H20 is negligible) -Ag:”:<l//7l A fllzr :: —/r/0+ (aflfdqufl/fl) _ /WIA4T"C - Answer fl/é/nsfi/QJH 3F/V01‘/"‘9/-75") .-: _/(7/¢7/¢§7 E) 15 the reaction spontaneous or non spontaneous as written? Afl:/~5=*l Air—- 2’: 22m) 52W74M‘ flwafifi Answer W%W “g Name ' /%= ‘ Section X(7 pts) For the reaction HCl(aq) + KOH(aq) 9 H200) + KCl(aq) AH = — 56.0 kJ/mol When KOH is added to 50.0 mL of a 0.220 M HCl solution at 22.2 °C until the concentration of KOH = 0.440 M, what is the final temperature of the mixture? ' Assume: specific‘heat = 4.184 Mg °C and dmix = 1.01 g/ mL MAW/é! M. 057) A) (J. 2201?: 0' 0””j . mica M. SHOW/M W401; : (a. mm.) (a. L/l/(JH = 0.022 a WORK (fizz-(m two/14301.14 =(A 02/) (—52, 0 gr) 2. — 4 6/6/47“ m Qty/3r "‘ QKW‘CA“ _- W84 7:63-0M4fifi’Q/éA/Hga) (El-229 ' é/éza709-27L-N/69/4/ 7“ .: Ljej/(JC ‘ XI(5 pts) What is the specific heat of a metal (X) if 95.0 g of metal at 75.0 0C are placeii; in 0.0 g H O at 180°C and the final temperature is 230°C. ,2 )1 J" r q, ,a 0 : flgm M ‘ 4.2 (53. aflflgfyg C); -75;¢){afi SHOW 3 ' . (chT)-,JIU:-(mcdflmu ' C: 5/2”“? C W0 . I .. .— ". 2?. a ,0 “(gm oiX/fliva’cfléfi'o4“) ’ (£5 05%“ 0 gr )Answa Z'ZZZJ/foJ/fzgfic C':&,gjz>e car/51% ; PAGE4 X110 On the axes provided, draw the following orbi Is: 2 A) 1); B) d C) dz, - - x )C 7‘ 0% PAGE 5 PAGE 6 ' SCORE POINTS PAGE 7 r PAGE 8 PAGE 1 104 PAGE 2 PAGE 3 ...
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Chem103F06T3 - Cheml 03F06 Exam 3A Name ‘ Section 1(5...

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