2011_Spring_2_key - Chemistry 1A Spring 2011 Exam 2 Key...

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1 Chemistry 1A Spring 2011 Exam 2 Key Chapters 5, 6, and 7 (part) You might find the following useful. 0.008314 kJ Δ H° = Δ E° + ( Δ n)RT R = K• mol cal w 0.00418 kJ q = C + m Δ T g C    H rxn = H f (products) H f (reactants) Thermodynamic Properties for Some Common Inorganic Substances Substance State H f kJ/mol Substance State H f kJ/mol Ag s 0 H 2 g 0 AgCl s 127.04 H 2 O g 241.83 Al s 0 H 2 O l 285.8 Al 2 O 3 s 1669.79 H 2 O 2 l 187.6 Br 2 l 0 Hg l 0 HBr g 36.23 I 2 s 0 C(graphite) s 0 HI g 25.94 C(diamond) s 1.90 Mg s 0 CO g 110.5 MgO s 601.8 CO 2 g 393.5 MgCO 3 s 1112.9 Ca s 0 Mg(OH) 2 s 924.54 CaC 2 s 59.8 N 2 g 0 CaO s 635.55 NH 3 g 46.25 CaCO 3 s 1206.88 NO g 90.37 Ca(OH) 2 aq 1002.82 NO 2 g 33.85 Cl 2 g 0 N 2 O 4 g 9.66 Cu s 0 N 2 O g 81.56 CuO s 155.23 O g 249.4
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2 Substance State H f kJ/mol Substance State H f kJ/mol F 2 g 0 O 2 g 0 Fe s 0 O 3 g 142.2 FeO s 272 S 8 (rhombic) s 0 Fe 2 O 3 s 824.2 S 8 (monoclinic) s 0.30 Fe 3 O 4 s 1118 SO 2 g 296.06 HCl g 92.31 SO 3 g 395.18 HF g 268.61 H 2 S g 20.15 H g 218.2 ZnO s 347.98 Thermodynamic Properties for some Common Organic Substances Substance Formula State H f kJ/mol Acetic acid HC 2 H 3 O 2 l 484.21 Acetaldehyde CH 3 CHO g 246.81 Acetone CH 3 COCH 3 l 246.81 Acetylene C 2 H 2 g 226.6 Benzene C 6 H 6 l 49.04 Ethanol C 2 H 5 OH l 276.98 Ethane C 2 H 6 g 84.68 Ethylene C 2 H 4 g 52.3 Formic acid HCO 2 H l 409.20 Glucose C 6 H 12 O 6 s 1274.45 Methane CH 4 g 74.85 Methanol CH 3 OH l 238.66 Sucrose C 12 H 22 O 11 s 2221.70
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3 For each of the following, write the word, words, letter, letters, or number in each blank that best completes each sentence. (2 points per blank) 1. Ionize means to form ions (often as a substance dissolves in water). Dissociate means to separate into ions (often as a substance dissolves in water). 2. Spectator ions are ions that play a role in delivering other ions into solution to react but that do not actively participate in the reaction themselves.
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2011_Spring_2_key - Chemistry 1A Spring 2011 Exam 2 Key...

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