CHEM 108 (Fall-2006) Exam. 1 (Section 001) (103 pts)

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1 CHEM 108 (Fall-2006) Exam. 1 (Section 001) (103 pts) Name: , CLID # LAST NAME, First (Circle the alphabet segment of your LAST NAME): A-B C-F G-L M-O P-Z Please answer the following questions: Part I: Multiple Choices (64 pts: 4 pts each). Circle the ONE best answer: 1. Which of the following pairs is most likely to be heterogeneous? a) methanol, CH 3 OH, and water, H 2 O b) hexane, CH 3 (CH 2 ) 4 CH 3, and octane, CH 3 (CH 2 ) 6 CH 3 c) potassium chloride, KCl, and carbon tetrachloride, CCl 4 d) acetic acid, CH 3 COOH, and water, H 2 O 2. Which statement is incorrect regarding the solubility of gases in liquids? a) Henry s law states that C = kp. b) The solubility of a gas increases as the pressure increases. c) Since the dissolving of gases is endothermic, increasing temperature leads to decreasing solubility. d) The Henry s law constant, k differs for different gases and liquids. 3. Which of the following solutions has the highest boiling point? a) 1.0 m glucose in water b) 1.0 m NaCl in water c) 1.0 m KNO 3 in water d) 1.0 m CaCl 2 in water 4. What is the osmotic pressure, in atm, produced by a 20.0% glucose (C 6 H 12 O 6, molar mass = 180 g/mol) solution (d = 1.08 g/ml) separated from pure water at 25 ºC? a) 36.7 b) 30.6 c) 29.3 d) The experimental data from a certain reaction gives these graphs. What is the most likely order of this reaction? a) zero b) first c) second d) third 6. The reaction: A B, the activation energy, E a = 125 kj/mol, and the heat of reaction H = + 50 kj/mol. What is the E a for the reverse reaction in kj/mol? a) 75 b) -75 c) 125 d) 175 1

2 7. When a solid NH 4 SH is placed in a close flask at 28º C, the solid dissociates according to the equation: NH 4 SH (s) NH 3 (g) + H 2 (g) The total pressure of the equilibrium mixture is atm. Determine K p at this temperature. a) b) c) d) Which physical property is not true regarding solutions of nonvolatile solutes? a) vapor pressure of the solution is lower. b) boiling point of the solution is higher than that of pure solvent c) osmotic pressure is produced by solvent in the more dilute solution toward the more concentrated solution d) all of the above are correct 9. What is the minimum mass of glycerol, C 3 H 8 O 3, that must be dissolved in 100. g H 2 O to prevent the solution from freezing at -15 o C? a) 74 g b) 66 g c) 7.4 g d) The half-life time of the first order reaction A B is 5.0 min. How many minutes will it take to reduce the concentration of A to 1/16 of the initial value? a) 5.0 b) 25 c) 10. d) Which is not usually a factor in determining the rate of a reaction according to collision theory? a) Orientation of the molecules that colloid b) Kinetic energy of the molecules colloid c) The temperature of the reaction mixture d) The stability of the product 12. For the system: SnO 2 (s) + 2 CO (g) Sn (s) + 2 CO 2 (g), the equilibrium constant expression is a) [Sn][CO 2 ] 2 /[SnO 2 ][CO] 2 b) [SnO 2 ][CO] 2 /[Sn][CO 2 ] 2 c) (P CO2 ) 2 /(P CO ) 2 d) P CO2 /P CO 13. A 6.0 m H 2 SO 4 solution has d = 1.34 g/ml. What is the mass percent of H 2 SO 4 in this solution? a) 56.1 b) 58.8 c) 37.0 d) no answer was given 14. Which plot would not yield the indicated data for the reaction A Products? a) ln [A] vs. t: rate constant for a first order reaction b) 1/[A] vs. t: rate constant for a second reaction c) ln k vs. T (K): activation energy d) non of the above 2

3 15. The solubility of O 2 (g), in water at 25 o C is 3.16 ml/100 g H 2 O when the gas pressure was maintained at 1 atm. What pressure of O 2 (g) would be required to produce a saturated solution containing 10.9 ml/100 g H 2 O? a) 4.45 b) 3.45 c) d) Some PCl 5 (g) with a partial pressure of atm is heated in a closed container and the following equilibrium is obtained: PCl 5 (g) PCl 3 (g) + Cl 2 (g). The equilibrium pressure of Cl 2 is atm. What is K p for this reaction at this temperature? a) 3.93 b) 1.00 c) d) Part II (39 pts: 13 pts each) Calculations: Show all work for full credit. Please express all answers with proper units and correct number of significant figures. 1. Initial rate data were obtained for the following reaction: H 2 (g) + Cl 2 (g) 2 HCl (g) Expt No. Initial [H 2 ], M Initial [Cl 2 ], M Initial Rate, M.s x x x x 10-3 a) What is the overall order of the reaction? b) What is the rate law for the reaction? c) What is the rate constant of the reaction? a) Overall order = b) Rate law = c) k = 3

4 2. Nicotine, extracted from tobacco leaves, is a liquid completely miscible with water at temperature below 60 C. If a solution made by dissolving g of nicotine in g H 2 O starts to freeze at C. What must be the molar mass of nicotine? (K f = 1.86 C/m for water). MM = 3. Glycerin, C 3 H 8 O 3 (92.1 g/mol), is a nonvolatile non-electrolyte with density of 1.26 g/ml at 25 C. a) Calculate the vapor pressure at 25 C of a solution made by adding 50.0 ml of glycerin to 500. ml of water. The vapor pressure of pure water at 25 C is 23.8 mmhg. b) Calculate the osmotic pressure of the solution at 25 C. Vapor pressure = Osmotic pressure = 4

5 Exam 1 Spring 2006 You will have 55 minutes to complete this exam. The exam has 4 pages plus a reference page. When you are told to do so, tear off the Periodic cover sheet and use as required during exam. Constants & Useful Equation : Gas Constant: R = J/K.mol = x 10-3 kj/k.mol = L atm/mol.k K = C 1 atm = 760 torr = 760 mmhg d (density) = mass (m)/volume (V) C g = k.p g n i = P i /P t PV = nrt π = [C]RT T = i. Km. P 1 = χ 1.P 1 o P 1 = χ 2.P 1 o Rate = k[a] ln [A] o = kt ln[a] = - kt + ln[a] o t 1/2 = ln 2/k = 0.693/k [A] Rate = k[a] 2 1/[A] - 1/[A] o = kt t 1/2 = 1/k[A] o Rate = k [A] = - kt + [A] o t 1/2 = [A] o /2k k = Ae -Ea/RT PREFERENCE SHEET FOR CHEM 108 ln k = (-E a /R)(1/T) + ln A H Li Na K Rb Cs Fr (223) 4 Be Mg Ca Sr Ba Ra Periodic Table of the Elements Sc Ti V Cr Mn Fe Co Ni Cu Zn Y La Ac Zr Hf Rf (261) 41 Nb Ta Db 42 Mo W Sg (262) (263) 43 Tc (98) 75 Re Bh (262) 44 Ru Os Hs (265) 45 Rh Ir Mt (266) 46 Pd Pt Uun (269) 47 Ag Au Uuu (272) 48 Cd Hg Uub (277) B C N O F Al Ga In Tl Si Ge Sn Pb P As Sb Bi S Se Te Po (209) 17 Cl Br I At (210) 2 He Ne Ar Kr Xe Rn (222) Ce Pr Nd Pm Sm Eu Gd Tb Dy (145) Th Pa U Np Pu (244) 95 Am (243) 96 Cm (247) 97 Bk (247) 98 Cf (251) Ho Er Tm Yb Lu Es (252) 100 Fm (257) 101 Md (258) 102 No (259) 103 Lr (260) 5

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B I N G O B I N G O. Hf Cd Na Nb Lr. I Fl Fr Mo Si. Ho Bi Ce Eu Ac. Md Co P Pa Tc. Uut Rh K N. Sb At Md H. Bh Cm H Bi Es. Mo Uus Lu P F.

B I N G O B I N G O. Hf Cd Na Nb Lr. I Fl Fr Mo Si. Ho Bi Ce Eu Ac. Md Co P Pa Tc. Uut Rh K N. Sb At Md H. Bh Cm H Bi Es. Mo Uus Lu P F. Hf Cd Na Nb Lr Ho Bi Ce u Ac I Fl Fr Mo i Md Co P Pa Tc Uut Rh K N Dy Cl N Am b At Md H Y Bh Cm H Bi s Mo Uus Lu P F Cu Ar Ag Mg K Thomas Jefferson National Accelerator Facility - Office of cience ducation

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