Makeup Exam 1 - Version 026 — Make up Exam 1 w Laude -...

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Unformatted text preview: Version 026 — Make up Exam 1 w Laude - (52390) 1 This print—out should have 30 questions. Multiple—choice questions may continue on the next column or page m find all choices before answering. 001 6.0 points Which of the following is a restatement of Henry’s Law? . Heating a solution will decrease the solow bility of gases dissolved in it. ® As the partial pressure of a gas above a liquid increases, the gas’s solubility in that liquid also increases A mixture of two liquids will have a vapor pressure that isn’t equal to either of the pure liquid’s vapor pressures. 1. Adding a non—volatile solute to a liquid wili lower its vapor pressure. 002 6.0 points Which of the following highly soluble salts would he the most useful for lowering the freezing point of a solution? 1. 082304 2. CSQCIQOT 3. (NH4)3P04 082(5804)3 5. KB): 003 6.0 points Which of the following phase changes is not correctly paired with the sign of its change in enthalpy? 1. vaporization, All is ~i- /2€ condensation, All is - 3. melting, AH is + A. freezing, AH is — (3. deposition, AH is + 004 6.0 points The vapor pressure of pure water (13120) at 30 00 is 40 torr. If salt (NaCl) is dissolved into a sample of water until the total vapor pressure of the mixture at 30 “C is 02 torr, what is the mol fraction of salt? 1. 0.5 2. 0.65 3. 0.35 4. 0.8 @702 005 6.0 points Which of the following would lower the va— por pressure of a sample of water in a closed container? xi?) decreasing the size of the container II) lowering the container temperature ,LH’) removing water from the container 1. I and III only 2. I and II only 6.) ii onlt 4. II and III oniy 5. E, II and III 6. I only 7. III only 006 6.0 points For the endothermic formation of sulfuric acid Heolg) + 303%) H H2304lg) (decreasing/ increasing) the pressure of the system and (raising/lowering) the tempera— ture of the system would shift the reaction to the left. 1. decreasing, raising Version 026 w Make up Exam 1 — Laude m (52390) 2 /2/. increasing, lowering @ decreasing, iowering 4. increasing, raising 007 6.0 points Determine the moiar solubility of aluminum oxide (A1203) mg, m 1.08 x 1045. 1. 1 x 10"“1 M 008 6.0 points Consider the reaction: M; 6 \o o 0 N0 a + 002 aq) <~> N02(aq + (301.23g) If KC m 100, and the initial concentrations of NO, C03, N02 and C0 are 5, 10, 0 and 0 M respectively, what is the eqiiilibrium con» centration of 002? 1. 0.1 @511 V‘” 3. 15.1 nag 4. 4.9 5. 14.9 6. 9.9 009 6.0 points The combustion of standard change in enthalpy, AH = m5, 500 kJ - moi—1. If the reaction were per— formed at T1 w 200K‘and T2 = 300 K, which pair of equilibrium constants might be cor—. rect? octane has a 1. K1 m 100,35 e 10 @1561 = 10300,K3 e 1 .31 K1: 10,K2 = 100 ,4. K1 m 1,K2 = 10300 010 6.0 points Rank foliowing saits from least to most solw ble: AgI K5,, = .5 x 10"“16 Ag2003 K,,, m 6.2 X 10”” AggS K,,,, m 1.6 x 10‘49 A SON K3,, : 1.2 x 10-12 AggS < Agl < AgSCN < AggOg 2. AgSCN < Ag903 < AggS < Agl 3. Agc03 < AggS < Agf < AgSCN 4. AgI < AgSCN < Achg < AggS 011 6.0 points Which of the following reactions would be the most useful, in terms of thermodynamics, if you were trying to make ”C?” 1F+EHC+D Kem” @A+B<—»C Kero‘10 3C+A<—>D Kenn“) 42D<~>G Ken)?” 5.2CHF - Km10”5 012 6.0 points Carbon Dioxide Version 026 ~ Make up Exam 1 w Laude m- (52390) 3 Pressure, bar 100 200 250 300 350 400 Temperature, K If you start at 103 bar and 210 K then isothermaliy decompress to 1 bar, then iso— barrically heat to 275 K, then isothermaliy compress to 102 bar, how many phase tran— sitions has the system undergone and what state of matter is the 002 in? 1. 3, liquid 2. 3, supercritical fluid 3. 3, gas 41. 2, soiid © 2, liquid 6. 2 gas 013 6.0 points Which of the following statements is/are aiways true concerning Kw? / I) It gets larger as the temperature in— creases II) It equals 10""M “(111) K ={I—I+][OH'l 4. II, In 5. I only 6. III only 7. I, II, III 014 6.0 points Consider the thermite reaction, which is strongly exothermic: Fe203(s) + 2 A1(s) <—-u-> A1203(s) + 2 Fe(s) Which of the foliowing types of stress could be applied to the reaction to shift it left or right? /Yj increase or decrease the pressure / II) raise or lower the temperature III) adding an inert gas 3 1. Iand 11 only (a 1" 7" @311 only 3. II and III only 4. I and III only 5. I oniy 6. I, II and III 7. III oniy 015 6.0 points Consider the reaction: 8(8) + 3 F2(g) (we SF6(g) If K m 103 and 0.1 mol of each species is added to a 1 L container, what will occur? 1. the reaction shifts right 2. the reaction shifts left 3. not enough information @nothing will occur Version 026 — Make up Exam 1 w Lands —~ (52390) 4 016 6.0 points What would be the pH of a solution of hy— poiodous acid (H01) prepared by dissolving 144 grams of the acid in 200 mL of pure water (H20)? The Ka of hypoiodous acid is 2 10""11 5 2. 13 ,5/ 3. 1 4. 7 5. 10 017 6.0 points What would be the pH of a 0.563 M solution of ammonia (NI-£3) at room temperature? The Kb of ammonia is 1.78 x 105. 1. 2.5 3 M x WWIO... @115 0‘ a” a9 4. 4.5 5. 7 018 6.0 points Which of the following is a possible combina~ tion of values for AHlamce, Athdmtmn and AHSOlutgon, respectively, for a salt whose dis— solution is exothermic. a: "260, M278, and 18 kJ - marl © +461, W465, and —— 4 M 451101"I 3. +380, “351, and 29 k3 - Inon 4.. +302, W274, and —28 kJ -mol""1 019 6.0 points Consider the reaction, Na+(aq) + Cl‘(aq) «We NaCl(aq) The equilibrium constant, K, is 2. If the concentrations of Na+, Ci“ and NaCl are 2, 2 and 10 M, respectively, which of the following would occur? ‘ we 5‘ @the reaction would move left 2. the reaction wouid move right 3. nothing would occur gain; 7,5. 4. not enough information 020 6.0 points Which of the following statements is/are true concerning auto—protolysis‘? / I) [OH”] is always equal to [H~+—] II) [ll-H can be zero VIII) It is an endothermic process 1. I, II, III 2. II only 6. II, III - 7. In only 021 6.0 points Which of the following is not related to colligative properties? X. Applying a pressure across a semi— permeable membrane to force pure water across. @Water boiling at 75 06' instead of 100 °C high in the Himalayan mountains. 3/. Adding lots of salt to ice to lower its freezing point when making ice cream. Version 026 — Make up Exam 1 w Laude — (52390) (:51 ‘ Mixing water and anti~freeze to improve 3. :1: and z radiator fiuid’s freezing/boiiing point. 4. z and y 022 6.0 points 5. y and 3: Write the equilibrium expression for the fol- lowing reaction: 6. z and a: 2 New) + 4 H2005?) «m» @ and y 3 H2(aq) + 2 wag) + 2 Noam) _ 024 6.0 pomts » ' [H213 - {Hr}? - [Nor—12 @ K w [No]? How much heat i8 required to heat 0.1 g of 2 ice at “30 °C to steam at 100 0C? Use the ap— flf K w [No] proximate values below for your caicuiation. [HflQ'iNOEiz Cice=2J/g'oc 3. +2_ w2 Csteamsz/g‘oc fifK=W %ater:43/g‘oc [NO] - [H2O] AHmp e 2, 260 J/g [NO]2 [$wa = 340 J/g AK 2 [H2]3 ' [Hflz ' [N032 ylgg J 5 K x [W]?- [N05]? ' [N012 /1 74 J 023 6.0 points Which line segments (33, y and z) correm 80 J spond to sublimation/deposition and vapor- ization/condensation, respectively? 187 J Carbon Dioxide 104 5 300 J H 3 pg 10 ® 306 J E“ 2 g 10 025 6.0 points 5 rl‘he equilibrium constant for a given reaction is 10. What is the corresponding change in free energy? 3510 Ed - Inol"1 101 9 10200 250 300 350 400 _1 3.5,700J-m01 Temperature, K ,a —10 a} - moi-1 1. not enough information 4. 5.? k3 - mo}—1 2. y and z @_5.7 M - moi—1 Veision 026 — Make up Exam 1 % Laude w (52390) 6 026 6.0 points An unknown iiquid has a vapor pressure of 88 mmHg at 45 OC and a heat of vaporization of 32 in] /rnol1 what is its vapor pressure at; 55 °C? ’1 1.156 mmHs W " i-W w @127 mmHg ,w if a .499“? 3. 61 mmHg 4. 89.4 mmHg 027 6.0 points Bank the following liquids in increasing order of soiubility in water (H30): CH3F, (CH3)2NH, CH301, CBr4. " ' @ can1 < CH301< CH3F < (Gemini 2. CH301< CH3}? < (CH3)2NH < 013a. ,3.“(CH3)2NH < 013a < CH301< CH3F 4. CHgF < (CH3)2NH < 013:4 < 03301 028 6.0 points Which of the foliowing equations could not be used to convert between {I—I+], {OI-1‘}, pH, and pOH'? 3. all of these equations are accurate Kw [01*] 3. {11+} = iii—PH 2. pH : miog @pOH = w Iog Kw + 10g[H"l“) 5'. [0191") = iowKw w IO'PH _ K e. {on } z 029 6.0 points What would be the pH of a solution of ni— tric acid (HNOg) prepared by dissolving 126 grams of the acid in 5 L of pure water (H20)? C13 0.6 2.0 " 3.1 4. 0.7 030 6.0 points Rank foilowing acids from most to least basic: ammonia (NHg) pr = 4.74 aniline (CgH5NH2) pr : 9.432 pyridine (C5H5N) pr = 8.77 methylamine (CHgNHg) pr = 3.34 1. C5H5N > 05H5NH2- > CH3NH2 > NHg @ CHgNHg > NH3 > 05H5N > CsH5NH2 3. CfiH5NH2 > CHgNHQ > NH3 > C5H5N 4. NH3 > C5H5N > 06H5NE2 > CH3NH2 ...
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This note was uploaded on 09/27/2010 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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Makeup Exam 1 - Version 026 — Make up Exam 1 w Laude -...

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