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1 Name (Print) Section # or TA 1. You may use a crib sheet which you prepared in your own handwriting. This may be one 8-1/2 by 11 inch sheet of paper with handwriting only on one side. 2. You may use a calculator. 3. Please place all books, bags, hats, etc. under the table before you begin the Exam. 4. You must work alone. Give or take no assistance from other students. Recall the Georgia Tech Honor Code. I pledge my honor that I have not violated the Honor Code during this examination. Signed 5. Show your Buzz Card when you turn in your completed exam. 6. Multiple Choice, no partial credit. 7. You may remove the last page(s) of this test, which contains relevant data. If you do so, please remove it carefully so that remaining pages remain stapled. In order to prevent lost pages, please write your name on the top of each page, in addition to this cover page. 8. Before turning in your test, make sure that at a minimum pages 1-8 are attached. Page 2 20 points Page 3 12 points Page 4 12 points Page 5 12 points Page 6 19 points Page 7 20 points Page 8 15 points TOTAL 110 points Page 1 of 10

2 Name (Print) Section # or TA 1. (6 points) Under what conditions will the reaction, 2 Cu(s) + O 2 (g) 2 CuO(s), be spontaneous? At 25 C G f = 130 kj mol 1, H f = 157 kj mol 1, and S f = 93.0 J K 1 mol 1. a. under all conditions b. under no conditions c. at high temperature d. at low temperature 2. (7 points) The equilibrium constant at 298K is K = 2.0 x 10-3 for the gaseous reaction 3 A (g) + B (g) 2 C (g) For this reaction H 298 = 40.0 kj/mol. The Gibbs free energy at 298 K for this reaction is a kj/mol b kj/mol c kj/mol d kj/mol 3. (7 points) What is the standard entropy of the following reaction at 25? At 25 C, the standard enthalpy of this reaction is kj mol -1 and the standard Gibbs energy for the reaction is kj mol NO (g) + O 2 (g) 2 NO 2 (g) a JK -1 mol -1 b JK -1 mol -1 c JK -1 mol -1 d JK -1 mol -1 Page 2 of 10

3 Name (Print) Section # or TA 4. (5 points) Sodium chloride dissolves in water with a positive enthalpy of solution at room temperature. NaCl (s) + water NaCl (aq) H = + 4 kj/mol What can you conclude about the entropy and Gibbs function changes for this process? a. S is positive and G is negative b. S is negative and G is positive c. S is positive and G is positive d. S is negative and G is negative 5. (7 points) When the following redox reaction is correctly balanced in an acidic solution, how many electrons are transferred? a. 2 Sn (s) + NO 3 (aq) Sn 4+ (aq) + N 2 O (g) b. 4 c. 6 d. 8 Page 3 of 10

4 Name (Print) Section # or TA For questions 6-8, consider the following half-reactions Reduction Half-Reaction E (Volts) Cl 2 (g) + 2 e 2 Cl (aq) I 2 (g) + 2 e 2 I (aq) Pb 2+ (aq) + 2 e Pb (s) V 2+ (aq) + 2 e V (s) (4 points) Which of the following is the weakest oxidizing agent? a. Cl 2 b. Cl c. V 2+ d. V 7. (4 points) Which of the following is the strongest oxidizing agent? a. Pb b. Pb 2+ c. V 2+ d. V 8. (4 points) Which of the following is the strongest reducing agent? a. Cl 2 b. I c. V 2+ d. Pb Page 4 of 10

5 Name (Print) Section # or TA For questions 9 through 11, assume that you assemble a galvanic cell based on the halfreactions Zn 2+ (aq) Zn (s) and Ag + (aq) Ag (s). Refer to potential differences at the end of the test. 9. (4 points) Which electrode is the anode? a. Zinc ion b. Zinc c. Silver ion d. Silver 10. (4 points) If you use a silver wire as an electrode, is it the a. Anode? b. Cathode? c. Inert electrode? d. Salt bridge? 11. (4 points) How many moles of electrons flow per mole of reaction and in which direction do the electrons flow? a. One mole of electrons from Ag electrode to Zn electrode b. Two moles of electrons from Ag electrode to Zn electrode c. One mole of electrons from Zn electrode to Ag electrode d. Two moles of electrons from Zn electrode to Ag electrode Page 5 of 10

6 Name (Print) Section # or TA 12. (6 points) A current of 2.50 amps is passed through a solution of Ni(NO 3 ) 2 for 2.00 hours. What mass of nickel is deposited at the cathode? Molar mass of Nickel is g/mol. a g b g c g d g 13. (7 points) A galvanic cell is constructed from the two half-cells, (Zn 2+ Zn) and (In 3+ In), with the electrolytes Zn(NO 3 ) 2 and In(NO 3 ) 3 in the two half-cells both being 1.00 M in concentration. At 25 C this cell gives a voltage of V, and it is observed that In metal is plating out on the In electrode as time passes. Determine the standard reduction potential for the (In 3+ In) half-cell. [See tabulated E values below (last pages) for the (Zn 2+ Zn) halfcell.] a V b V c V d V 14. (6 points) Identify the correctly balanced oxidation half reaction in the following galvanic cell: a. Ag + + e Ag b. MnO H e Mn H 2 O c. Mn H 2 O MnO H e d. Ag Ag + + e Ag (s) Ag + (aq) MnO 4 (aq), Mn 2+ (aq) Pt Page 6 of 10

7 Name (Print) Section # or TA 15. (6 points) It is known that the rate expression for the reaction A + 2B Products is Rate = k[a][b] 2. If the concentration of A and B are both tripled, the rate will be increased by what factor? a. 3 b. 9 c. 12 d (8 points) The following data were obtained for the decomposition of butane gas at elevated temperature. What is the rate constant for this decomposition reaction? a s -1 b s -1 c. 9.0 x 10-6 mol/l/s d. 1.8 x 10-5 mol/l/s [C 4 H 8 ] Rate [mol/l] [mol/l/s] x x x (6 points) The following reaction has a rate law of Rate = k[clo 2 ] 2 [OH ]. What is the effect of changing the ph from 12.0 to 11.0? The reaction rate a. Increases by 10 b. Decreases by 10 c. Increases by 100 d. Decreases by ClO 2 (aq) + 2 OH (aq) ClO 3 (aq) + ClO 2 (aq) + H 2 O (l) Page 7 of 10

8 Name (Print) Section # or TA 18. (5 points) Which of the following is the rate law for a reaction that is zeroth order in oxygen? a. rate = k [NO 2 ] b. rate = k [NO 2 ] [O 2 ] c. rate = k [NO 2 ] 2 [O 2 ] -1 d. rate = k [NO 2 ] 2 [O 2 ] -1 [N 2 ] EXTRA CREDIT You must show all of your work to receive any credit. A cell is constructed with the overall reaction as follows 2 Cr (s) + 3 Pb 2+ (aq) 2 Cr 3+ (aq) + 3 Pb (s) The E value for the half cell Cr 3+ Cr is 0.74 volts and for the half cell Pb 2+ Pb the reduction potential is volts. 19. (4 points) What is the standard cell voltage for this cell? a Volts b Volts c Volts d Volts 20. (6 points) If [Cr 3+ ] = 0.1M and [Pb 2+ ] = 0.01M, what is the cell voltage? a Volts b Volts c Volts d Volts Page 8 of 10

9 Name (Print) Section # or TA The following standard reduction potentials are valid for aqueous solutions at 25 C. Reduction Half-Reaction Standard Reduction Potential E (V) MnO 4 +8H + + 5e Mn H 2 O Au e Au Br e 2Br Hg e 2+ Hg Hg e Hg Ag + + e Ag Fe 3+ + e Fe I 2 (s) + 2e 2I Cu e Cu Sn e Sn Ni e Ni Cd e Cd Fe e Fe S + H 2 O + 2 e HS + OH S 2 O H 2 O + 4 e 2S + 6OH Zn e Zn Al e Al Mg e Mg Fundamental Constants and Conversions Atomic mass unit: u = 1.661x10-27 kg = (mass of 12 C/12) Avogadro's constant N 0 = x mol 1 Boiling point of H 2 O at P = 1 atm is C = K Calorie 1 cal = J (exactly) Electron charge e = x C Electron mass m e = x kg Faraday constant F = 96, C mol 1 Freezing point of H 2 O is 0.00 C = K Freezing point depression constant for water = 1.86 K kg mol -1 Ideal gas equation of state: PV = nrt MKS units of force and energy: 1 Newton = 1 kg m s -2 = unit of force = 1N 1 Joule = 1 kg m 2 s -2 = 1N m = unit of energy = 1J Planck's constant h = x J s Rydberg constant Ry = x J Speed of light in vacuum c = x 10 8 m s 1 (exactly) Standard Atmosphere 1 atm = x 10 5 Pa (exactly) Units of pressure: 1 atm = 760 mm Hg = x 10 5 Pa = x 10 5 kg m -1 s -2 Universal gas constant R = J mol 1 K 1 = L atm mol 1 K 1 Page 9 of 10

10 Name (Print) Section # or TA Species H f (25 C) (kj mol -1 ) S (25 C) (J K -1 mol -1 ) G f (25 C) (kj mol -1 ) C 2 H 2 (g) C 2 H 4 (g) C 2 H 6 (g) C 2 H 5 OH (l) CH 3 OH (l) Cl (aq) CO (g) CO 2 (g) Fe (s) H 2 (g) H 2 O (g) H 2 O (l) Mg 2+ (aq) MgCl 2 (s) NH 3 (g) NO (g) O 2 (g) O 3 (g) PbS (s) SO 2 (g) SO 3 (g) Page 10 of 10

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