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1 (C) Pavel Sedach and Prep101 1 (C) Pavel Sedach and Prep101 1
2 (C) Pavel Sedach and Prep101 2 (C) Pavel Sedach and Prep101 2
3 (C) Pavel Sedach and Prep101 3 (C) Pavel Sedach and Prep101 3
4 (C) Pavel Sedach and Prep101 4 (C) Pavel Sedach and Prep101 4
5 (C) Pavel Sedach and Prep101 5 (C) Pavel Sedach and Prep101 5
6 Chemistry 209 F15 Version A Page 6 of 9 SECTION II: Long Answers: To be graded manually (Total value 21) Answers must be written in non-erasable ink to be considered for re-grading. For full marks show all your work. Question 1 [Total value: 10 points] The plot below describes experimental results for two different measurements of the reaction A products. Use this plot to answer parts a) through d). Assume 2 significant figures when reading values from the plot Data For Question 1 Experiment 1 Experiment 2 a. [2 points] Calculate the average rate of consumption of A in the time period 0-10 s for Experiment 2. [A], mol/l b. [2 points] Calculate the initial rate of reaction for Experiment time (s) c. [2 points] Calculate the initial rate of reaction for Experiment 2. d. [4 points] Using the [A] 0 values from the graph and your results from parts b. and c., write the rate law for this reaction, including the value of k and its units. Assume a whole-number order for all components.
7 Chemistry 209 F15 Version A Page 7 of 9 Question 2 [Total value: 4 points] Calcium carbide (CaC 2 ), a solid, reacts with water to produce acetylene gas (C 2 H 2 ) and aqueous calcium hydroxide (Ca(OH) 2 ). a. Write the balanced equation for this reaction. [1 point] b. If g of calcium carbide is consumed in this reaction and the acetylene produced is captured in a L container at 20.0 C, at what pressure will the container be after the reaction is complete? [3 points] Question 3 [Total value: 4 points] One step in coal gasification relies upon the following endothermic process: C(s) + H 2 O (g) CO(g) + H 2 (g) K P = at C. a. If 1.00 g of carbon is added to a reaction vessel containing 1.00 M each of H 2 O, CO, and H 2 gases, predict the direction in which the reaction will proceed. Justify your answer. [2 points] [Question 3 continued next page]
8 Chemistry 209 F15 Version A Page 8 of 9 b. Based on the fact that the reaction is endothermic, compare the yield of the reaction at room temperature to the yield at C. Use 1 to 3 grammatically correct sentences to explain your answer. [2 points] Question 4 [Total value: 4 points] You prepare a M solution of chlorous acid (HClO 2 ). Chlorous acid has a pk a of Find the ph of this solution.
9 Chemistry 209 F15 Version A Page 9 of 9 1 1A 1 H Li Na K Rb Cs Fr (223) 2 2A 4 Be Mg Ca Sr Ba Ra Legend: Data Sheet CHEM H Periodic Table 18 8A Atomic number (Z) 13 Atomic symbol 3A Atomic mass (amu) Sc Y * La ** Ac (227) 22 Ti Zr Hf Rf (261) 23 V Nb Ta Ha (262) 24 Cr Mo W Sg (263) 25 Mn Tc (98) 75 Re Ns (262) 26 Fe Ru Os Hs (265) 27 Co Rh Ir Mt (266) 28 Ni Pd Pt Uun (269) 29 Cu Ag Au Uuu (272) 30 Zn Cd Hg B Al Ga In Tl A 6 C Si Ge Sn Pb A 7 N P As Sb Bi A 8 O S Se Te Po (209) 17 7A 9 F Cl Br I At (210) 2 He Ne Ar Kr Xe Rn (222) Lanthanides * Actinides ** 58 Ce Th Pr Pa Nd U Pm (145) 93 Np Sm Pu (244) 63 Eu Am (243) 64 Gd Cm (247) 65 Tb Bk (247) 66 Dy Cf (251) 67 Ho Es (252) 68 Er Fm (257) 69 Tm Md (258) 70 Yb No (259) 71 Lu Lr (260) Strong Acids: HCl, HBr, HI, HNO3, H2SO4, HClO4 Strong Bases: Hydroxides of Group 1 (Li to Cs) and Group 2 (Ca, Sr, Ba) Constants: Conversion Factors: Gas Constant: R = L atm mol -1 K-1 1 J = 1 kg m 2 s2 = L kpa mol -1 K-1 = J mol -1 K-1 T (K) = T ( C) = L bar mol -1 K-1 1 Pa = 1 kg m -1 s-2 = 10-5 bar Avogadro s number: NA = mol -1 1 L atm = J Faraday s Constant: F = C/mol electrons 1 atm = torr = kpa = mm Hg = bar Planck s Constant: h = J s 1 L = 10-3 m 3 Speed of Light: c = m s -1 1 C = 1 J/V Rydberg Constant: R = m -1 STP conditions: 0 C, 100 kpa Factoring Rydberg Constant: RH = R h c = J Electrochemical standard state: 1 atm, 1 M, 25 C ln ln ln 1 1 log log ln log Δ ln 1 1 ln 1 1 log ln
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