Spring 2007 Practice Exam Key Worked Problems

Spring 2007 - Exam 2 Name Section MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question 1 Given the

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Unformatted text preview: Exam 2 Name Section MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Given the data in the table below, AH°rxn for the reaction is 2) A weak electrolyte exists predominantly as 4NH3 (g) + 502 (g) —> 4NO(8) + 6H20 (1) Substance AHf” (kl/incl) k]. H20 (1) —286 NO (g) 90 N02 (g) 34 HNO3 (aq) —207 NH3 (g) ~46 A) —1892 C) —1540 D) —150 E) The AHf° of 02 (g) is needed for the calculation. A) ions B) an isotope 3) Given the following reactions N2 (g) +262 (g) 62165 (g) 7MP C) atoms in solution. AH = 66.4 k] £— anus-Ff 2 All 54-114.: the ent alpy of the reaction of the nitrogen to produce nitric oxide is A) 47.8 I. W N2 (g) 02 (g) » 2N0(g) B) -180.6 C) —47.8 goal AXU / B—1 D) 180.6 4. ( D) molecules > E) electrons 66.4 «Ker 11%? M3 L1: Afizm: {(70}? (6135)] "Ex/(~76) '1— 51:53 5% DE. @12. was KIT E) 90.3 4) Which of the following is an oxidation—reduction reaction? ' 4) B A) HCl(aq) + NaOH(aq) ~> H20 (1) + NaCl(aq) [03W 83(5) + 2X‘gN03 (aq) a 235$) + $03» (aq) ReoQ 0 K I C) Ba(C2H302)2 (aq) + Na2504 (aq) —> 361504 (5) + 2NaC2H302 (aq) PRZCJ [017.2% D) AgNO3(aq) + H0 (aq) —> AgCl(s) + HN03 (aq) pkg; l P E) H2C03 (aq) + Ca(NO3)2 (aq) —> 2HN03 (aq) + CaC03 (5) 1p 5,C 5) A AH corresponds to an process. A) positive, exothermic B) zero, endothermic @ositive, endothermic D) negative, endothermic E) zero, exothermic 6) What volume (1111.) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to 200 '6) fi‘ mL to make a 0.88 M solution of sodium hydroxide? A) 50.0 C) 2.64 D) 26.4 E)/17,6 \h (4,0on >=@.88@(2wm§ = 7) Which hydroxides are strong bases? 7) Sr(OH)2 KOH / NaOH ./ Ba(OH)2 / A) KOH, NaOH B) KOH, NaOH,Ba(OH)2 13> C) KOH, Ba(OH)2 r(OH)2, KOH, NaOH, Ba (OH)2 E) None of these is a strong base. 8) What are the spectator ions in the reaction between KOH (aq) and HN O3 (aq)? 8) I a @10 and N03' ,_. B) Id" and N03‘ M C) K+ and H+ / D) OH“ only E) H+ and OH— B-Z 9) Objects can possess energy as . 9) (a) endothermic energy ‘9) potential energy @ inetic energy A) a only B) b only C) c only E) a and C 10) Which combination will produce a precipitate? 10) C. A) NH4OH (aq) and HCl (aq) B) NaCl (aq) and HC2H302 (aq) .‘2 Nab H‘ + Fe (M59; ‘—> 725(0 59,15 W03 @aOI—I (aq) and Fe(N03)2 (aq) + , 1+ ~ 2» + o - D) AgNOs (acv and Ca(C2H302)2 (aoo “ ’2 H *' 72¢ 1‘ “ME; -’> 7125949: '1L 2A.: 1- 2.003 24- E N OH a andHCl a )a (q) (q) 71¢. +20H 11) Silver nitrate and aluminum chloride react with each other by exchanging anions: 11) i 2 3AgNO3 (aq)+ A1C13 (aq) -> A1(N03)3 (aq) + 3AgCl (5) What mass in grams of AgCl (143.33 g/mol) is produced when 422 g of Ag N03 (169.88 g/mol) react with 7.73 g of AlC13 (133.33 g/mol)? @ l A) 11.9 B) 17.6 C) 4.22 @ E) 24.9 m s 51. 3,1; _ 3 [6 ‘ A", .3 {A030 I 31.56 I4353 = 3 kad 474.1 l‘ggas 3M0! [Mal ‘ 1; gig, n m A56! .2 73 =69.05'3O §<M9! .?.;_.’T§§Wml [ 12) A 36.3 mL aliquot of 0.0529 M H2804 (aq) is to be titrated with 0.0411 M NaOH (aq). What 12) C, volume (mL) of base will it take to reach the euivalence point? A) 46.8 B) 3.84 D) 187 E) 1.92 #:50q ,. IA 0.05.2 “of MID: {L "(DéML XML = 36o3n6/'—%—_L—)IMDI XM* ML MW #1904 MOM" [L 9:909 'fi‘éim ”' #404 #502 + 10qu -> 2/4.o + Muse.) 2.. 13) Whine of the following is a weak acid? 13) A @ B) HN03 C) HCl D) HI E) HC104 B—3 14) What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of N 610 (58.44 g/mol) in sufficient water to give 350 mL of solution? 7 C D) 0.45 v / A) 2.7 x 10-2 B) 0.16 C) 18 E) 27 ><M°l - LC 15) In which species does sulfur have the highest oxidation number? A) 83 (elemental form of sulfu ) O + L14 ’ L +6 , L B + "' H s (9 K 5‘91 )502 fig 3 C>H2803 +4 -¢,« +2. ,4 +2. --15 w» aft ’2, E) H25 gel??? 16) The enthalpy change for the following reaction is —483.6 k]: 2H2(g) + 02 (g) —> 2H20(g) Therefore, the enthalpy change for the following reaction is k]: 4H2 (g) + 202 (g) —’ 4H20(g) A) -483.6 ~ xgzoléézxsr>=¥ ‘?é7.2./<3\ B) 967.2 C) 2.34 x 105 D) 483.6 17)‘A sample of aluminum metal absorbs 9.86 J of heat, ‘upon which the temperature of the sample ‘ increases from 232°C to 305°C. Since the specific heat capacity of aluminum is 0.90 J/gvK, the mass of the sample is g. A) 6.6 B) 72 v w” M N7 1863‘ ._ C) 65 D) 8.1 517}: 3-4 22) Based on the portion of the activity series above, which of the reactions will occur? d) 2%) + MI112(aq) —* Zn12(aq) + Mug) Sn(S) + Cu(C12)(aq) —’ anl2(aq) + Cu (5) Ag (5) + Pb(NO3)2(aq) —> 2 AgN03 (aq) + Pb (S) 3 Hg“) + 2 CI‘(1\IO3)3(aq) —’ 3 Hg(NO3)2(aq) + 2 Cr(s) C) s D) A) B) mi 23) The theoretical yield of MnClz in the following reaction is 3.67 grams. When a student 23) C performs the reaction in the laboratory, 2.84 grams are obtained. What is the percent yield for the reaction? Mn02 + HCl -—>MnC12 + C12 + H20 24) 5mm in a titration at which the indicator changes is called the e D) 22.6% A) 129 % B) 0.774 % ndpoint B) equivalence point C) volumetric point D) standard point E) indicator point 25) is an oxidation reaction. A) Table salt dissolving in water for cooking vegetables B) The reaction of sodium chloride With lead nitrate to form lead chloride and sodium nitrate usting of iron D) Neutralization of HCl by NaOH E) Ice melting in a soft drink 26) Which one of the following is a diprotic acid? A) chloric acid 03 B) phosphoric acid C) hydrofluroric acid H F D) nitric acid H “03 @lfuric acid H z 9 07 / B-6 ...
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This note was uploaded on 11/11/2009 for the course CHEM 1341 taught by Professor Compton during the Spring '08 term at Texas State.

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Spring 2007 - Exam 2 Name Section MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question 1 Given the

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