exam1fall2011f3

exam1fall2011f3 - GeneralChemistryI exam1 4/22/2011...

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General Chemistry I exam 1 4/22/2011 R. Lopez de la Vega Name_____________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which rate law is bimolecular? A) rate = k [A][B][C][D] B) rate = k [A] C) rate = k [A][A][B] D) rate = k [A][B] E) rate = k[A][B] 2 1) 2) Given the following proposed mechanism, predict the rate law for the overall reaction. 2NO 2 + Cl 2 2NO 2 Cl (overall reaction) Mechanism NO 2 + Cl 2 NO 2 Cl + Cl slow NO 2 + Cl NO 2 Cl fast A) Rate = k[NO 2 ][Cl] B) Rate = k[NO 2 Cl][Cl] C) Rate = k[NO 2 ][Cl 2 ] D) Rate = k[NO 2 Cl] 2 E) Rate = k[NO 2 ] 2 [Cl 2 ] 2) 3) Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water. A) 0.254 m B) 0.415 m C) 0.556 m D) 0.394 m E) 0.241 m 3) 4) The first - order decomposition of cyclopropane has a rate constant of 6.7 x 10 - 4 s - 1 . If the initial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s? A) 0.94 M B) 0.67 M C) 0.15 M D) 0.86 M E) 0.43 M 4) 5) What data should be plotted to show that experimental concentration data fits a zeroth - order reaction? A) [reactant] vs. time B) ln(k) vs. 1/T C) ln[reactant] vs. time D) ln(k) vs. E a E) 1/[reactant] vs. time 5) C 1
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6) Choose the aqueous solution below with the lowest freezing point. These are all solutions of nonvolatile solutes and you should assume ideal van ʹ t Hoff factors where applicable. A) 0.075 m NaBrO 4 B) 0.075 m LiCN C) 0.075 m (NH 4 ) 3 PO 4 D) 0.075 m KNO 2 E) 0.075 m NaI 6) 7) The first - order decay of radon has a half - life of 3.823 days. How many grams of radon decomposes after 5.55 days if the sample initially weighs 100.0 grams? A) 36.6 g
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exam1fall2011f3 - GeneralChemistryI exam1 4/22/2011...

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