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N_544639_2009-05-26 - (ID Hilton | HQ?“ CHE 1103 Section...

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Unformatted text preview: , (ID. . Hilton ' | HQ?“ CHE 1103 Section 002 General Chem—istry I Exam 2 Form A March 5, 2007 Answer Problems 1-20 on ParSCORE Test Form No. X-101864 with a No. 2 pencil. d... 1. How many moles of ions are released wheq 0.27 mol of cobalt(II) chloride, CoClz, IS dissolved in water? A. 0.81 mol CbUa\11"% CD SVC\2 g; 323:2: 0 Warm mow . {mm B. 8.8980mo1l \mottofilg 2. Select the correct set of products for the following reaction. Ba(OH)2(aq) + HNO3(aq) —> A. BaN2(s) + H200) Ba(N03)2(aq) + H200) C. Ba(s) + H2(g) + N02(g) D. Ba20(s) + N02(g) + H200) E. No reaction occurs 3. 1.0 M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity? N N0. N we £4qu B. £11 0 (th 1 KBiuéxdodd’) 13- flmooeu (acetic acid) 020 ogq 13' Her“ l0 0. mad .__. 4. Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copperal) nitrate. A. CuS NHH 5 3? Quakboa- ® (31128 C. NH4N03 D. NH4(N03)2 E. CuSO4 5. Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2N3C1(a€1) + Hg2(N03)2(aq) —" NaNO3(aq) + Hg2C12(S) A. Na (aq) + N03 (aq) ——> NaNO3(aq) ® Hg: (aq) + 201 (aq) a Hg2c12(s> C. NaCl(aq) —> Na (aq) + Cl (aq) 13- Hg2(N03)2(aq) —> ngz (061) + 2N03 (061) 13- ng2 (04) —’ Hg2(s) __ 6. Which of the following is a weak base? Q K Ca(OH)2 \QJ mm» D. NaOH E CH3COOH 7. Automobile batteries use 3.0 M H2804 as an electrolyte. w much 1.20 aOH will be needed to neutralize 225 mL of batter acid? ml. “ — , I y 996 1000000 11, ‘ .85”! m“ MM; HZSO4(aq) + 2NaOH(aq) —+ 211200) + Na2804(aq) A. 0.045 L 93f] moi Mai)“ 3WD\\71 95).; 0.28 L 652:) 0.56 L 3 ”@me D. 0.90 L E. 1.1 L x 8. Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar? A. 0.1 84% 1.63% C. 3.26% /D< 5.43% — B V 9.23% H 4 «DE-U 9. Calculate the oxidation number of the chlorine in perchloric acid, HClO4, a strong oxidizing agent. A. -1 ’ B. +4 C. +5 +7 E. none of these is the correct oxidation number 10. Sodium thiosulfate, Na28203, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. ' " “is—am -l0 O ~8‘D 4 2 2 .3_2'(aq) + 12(aq) —> s 062'(aq) + 21‘(aq) LT’Hm-‘J 1-(aq) c szogztaq) D. 34062104) y szosziaq) and 1'(aq) .. 11. Balance the following redox equation using the smallest integers possible and select the correct coefficient for the hydrogen sulfite ion, HSO3'. 141943-19 HS(:) 3 Mno4‘(aq> + HSOs'(aq) + H+<aq) —» Mn2+(aq) + Sofiaq) + H200) A. 1 B. 2 3 skp ~\%) (I? 1- «5-10 400 E. 10 12. Select the classification for the following reaction. 2Na(s) + 2H20(l) ~» 2NaOH(aq) + H2(g) /A{ precipitation ‘ «B? acid-base redox combination )2 none of these choices is correct 13. Which of the lines on the figure below is the best representation of the relationship between the volume and the number of moles of a gas, measured at constant temperature and pressure? Volume (L) (D (i V is ‘L ll/‘ git) \V x // Ob 0V 0 O A. B. c. D. venue CE 6 \(_ ___. 14. A sample of nitrogen gas at 29 K iron“ ‘ " 7 " V7H3L \l and 745 torr has a volume of 37.42 ‘L. What volume will it occupy if the pressure is increased to 894 torr at constant temperafirt:7 “I ‘ 5‘ ‘99- s \{ 9 .J \ r) 4" a _ A. 22.3L . B. 31.2L ?. \ ith 51/9 ?\\l\ “O 44.9L % 112L E. 380L 15. A sample of methane gas, CH4(g), occupies a volume of 60.3 L at a pressure of 469 torr and a temperature of 293°C. What would be its temperature at a ressure of 243 torr and volume of 60.3 L? A. 11513573; BMW}? 9 3% T :E; PQVQT} @1553C 71% “D; ?\\l\ @141 . 57.7°C E. 310.6°C __5 16. Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr. What mass of hydrogen was collected? (Pwamr = 24 torr at 25°C) A. 0.00765 g B. 0.0154 g CD 0.0159 g D. 0.0164 g E. 0.159g «x 17. A compound composed of carbon, hydrogen, and chlorine effuses through a pinhole 0.411 times as fast as neon. Select the correct molecular formula for the compound. A. CHC13 B. CH2C12 C2H2C12 D. C2H3Cl E. CC14 _ 18. Select the gas with the largest root-mean-square molecular speed at 25°C. A. NH3 . «3.77% 13- .\ °N a; E? .1739qu 3% /E.’ All the gases have the same root-mean-square molecular speed at 25°C. \19. Nitrogen will behave most like an ideal gas A. at high temperature and high pressure. B. at high temperature and low pressure. @ at low temperature and high pressure. at low temperature and low pressure. E. at intermediate (moderate) temperature and pressure. ._.~ 20. Use the van der Waals equation for real gases to calculate the pressure exerted by 1.00 mole of ammonia at 27°C in a 750-mL container. (a = 4.17 L ratm/molz, b = 0.0371 L/mol) A. 23.2 atm B. 27.1 atm @ 32.8 atm D. 42.0 atm E. 32.8 torr ...
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