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1 hemistry 1304 Name (please print) Exam 5 (105 points) May 3, 2017 n my honor, I have neither given nor received unauthorized aid on this exam. Signed Date ircle NLY the LETTER of your answer. 1. (3 points) alculate the standard free energy, G, for the electrochemical cell Pb(s) Pb 2+ (aq) Fe 3+ (aq) Fe 2+ (aq) Pt(s). a. 1.7 x 10 2 kj/mol b. 1.7 x 10 2 kj/mol c. 2.6 x 10 2 kj/mol d. 8.7 x 10 1 kj/mol e. 3.2 x 10 5 J/mol f. none of these 2. (3 points) Which chemical species undergoes reduction according to the following cell diagram? a. u (s) b. u 2+ c. l - u (s) u 2+ (aq) l - (aq) Agl (s) Ag (s) d. Agl e. Ag f. ul 2 3. (3 points) ow long will it take to produce 78 g of aluminum metal by the reduction of Al 3+ in an electrolytic cell with a current of 2.0 amp? a. 1.0 x s b. 13 hours c s d. 420 s e. 116 hours f. none of these 4. (2 points) PV, widely used in piping, fencing, etc., results from the polymerization of a. 2 c. 2 3 e. 2 l b. 2 3 d f. 2 N 5. (5 points) Draw the fully expanded structure of the products of the reactions below. learly label every atom and show every bond, i.e., not the fully condensed forms used for the reactants. + Br 2 AlBr 3 + l 6. a. (2 points) ircle peptide/amide linkage(s) in the following polypeptide. N N N n b. (2 points) In the box on the right above the structure of the monomer from which this polymer was made.

2 2 7. onsider the molecule on the right. The letters refer to N 2 f the individual carbon atoms in the following questions. a a. (1 point) Insert any lone electron pairs that are not shown. b. (4 points) Give the complete systematic name of this compound. b c g d e c. (3 points) What are the approximate bond angles around each of the following centers? a b d d. (4 points) What is the hybridization at each of the following atoms? a c f N e. (2 points) List the asymmetric atoms. 8. (8 points) Write complete structural formulas of the missing monomers or the missing polymers in the following reactions. In the blank, indicate whether the polymerization process is addition, condensation, or ring-opening.. type of polymerization: N 2 N type of polymerization: 9. (3 points) Give the structural formula for the products of the following reaction (7 points) Name the following compounds N

3 3 11. (10 points) A galvanic cell was constructed by connecting a nickel electrode that was dipping into a 1.80 M NiS 4 solution to a chromium electrode that was dipping into a solution of r 3+ of unknown concentration. The potential of this cell was measured to be 0.58 volts with the chromium as the anode. Determine the molar concentration (M) of r 3+ in the solution of unknown concentration. SW ALL WRK and chemical equations. 12. (10 points) Use appropriate electrochemical data to determine the formation constant (K f ) for Aul 4 - (aq). Include balanced chemical equations for all relevant reactions. 13. (8 points) Write the clear, semicondensed structural formula (e.g., see next problem) for each of the following compounds a. t-butylacetate b. propanamide c. cis-2-hexene d. ethylbenzoate

4 4 14. (20 points) Draw complete structural formulas for products of the reaction sequence shown below. You may write either fully or partially condensed formulas as long as the molecular structure, including the positions of functional group, is clearly shown.. [Note that it is often helpful to show all atoms, including at the site of the reaction.] excess Br [] A B + [] 3 N 2 E Na D F Na - 3 excess " 2 " G I J

5 hemistry 1304 Name (please print) Exam 5 (105 points) May 3, 2017 n my honor, I have neither given nor received unauthorized aid on this exam. Signed Date ircle NLY the LETTER of your answer. 1. (3 points) alculate the standard free energy, G, for the electrochemical cell Pb(s) Pb 2+ (aq) Fe 3+ (aq) Fe 2+ (aq) Pt(s). a. 1.7 x 10 2 kj/mol b. 1.7 x 10 2 kj/mol c. 1.2 x 10 2 kj/mol d. 8.7 x 10 1 kj/mol e. 3.2 x 10 5 kj/mol f. none of these 2. (3 points) Which chemical species undergoes reduction according to the following cell diagram? a. u (s) b. u 2+ c. l - u (s) u 2+ (aq) l - (aq) Agl (s) Ag (s) d. Agl e. Ag f. ul 2 3. (3 points) ow long will it take to produce 78 g of aluminum metal by the reduction of Al 3+ in an electrolytic cell with a current of 2.0 amp? a. 1.0 x s b. 13 hours c s d. 420 s e. 116 hours f. none of these 4. (2 points) PV, widely used in piping, fencing, etc., results from the polymerization of a. 2 c. 2 3 e. 2 l b. 2 3 d f. 2 N 5. (5 points) Draw the fully expanded structure of the products of the reactions below. learly label every atom and show every bond, i.e., not the fully condensed forms used for the reactants. + Br 2 AlBr 3 + l 6. a. (2 points) ircle peptide/amide linkage(s) in the following polypeptide. N N N n b. (2 points) In the box on the right above the structure of the monomer from which this polymer was made.

6 2 7. onsider the molecule on the right. The letters refer to N 2 f the individual carbon atoms in the following questions. a a. (1 point) Insert any lone electron pairs that are not shown. b. (4 points) Give the complete systematic name of this compound. b c g d e c. (3 points) What are the approximate bond angles around each of the following centers? a b d d. (4 points) What is the hybridization at each of the following atoms? a c f N e. (2 points) List the asymmetric atoms. 8. (8 points) Write complete structural formulas of the missing monomers or the missing polymers in the following reactions. In the blank, indicate whether the polymerization process is addition, condensation, or ring-opening.. type of polymerization: N 2 N type of polymerization: 9. (3 points) Give the structural formula for the products of the following reaction (7 points) Name the following compounds N

7 3 11. (10 points) A galvanic cell was constructed by connecting a nickel electrode that was dipping into a 1.80 M NiS 4 solution to a chromium electrode that was dipping into a solution of r 3+ of unknown concentration. The potential of this cell was measured to be 0.58 volts with the chromium as the anode. Determine the molar concentration (M) of r 3+ in the solution of unknown concentration. SW ALL WRK and chemical equations 12. (10 points) Use appropriate electrochemical data to determine the formation constant (K f ) for Aul 4 - (aq). Include balanced chemical equations for all relevant reactions (8 points) Write the clear structural formula for each of the following compounds.. Use the level of detail shown for the structure in the previous problem. a. t-butylacetate b. propanamide c. cis-2-hexene d. ethylbenzoate

8 4 14. (20 points) Draw complete structural formulas for products of the reaction sequence shown below. You may write either fully or partially condensed formulas as long as the molecular structure, including the positions of functional group, is clearly shown.. [Note that it is often helpful to show all atoms, including at the site of the reaction.] Br [] A B + [] 3 N 2 E Na D F Na - 3 " 2 " G I J

9 Some Standard Reduction Potentials E (volts) Au 3+ (aq) + 3 e - Au (s) l 2 (g) + 2 e r (aq) (aq) + 6 e - 2 r 3+ (aq) (g) (aq) + 4 e Aul 4 (aq) + 3 e - Au (s) + 4 l - (aq) Ag + (aq) + 1 e - Ag (s) Fe 3+ (aq) + e - Fe 2+ (aq) u 2+ (aq) + 2 e - u (s) Agl (s) + e - Ag (s) + l - (aq) (aq) + 2 e - 2 (g) Pb 2+ (aq) + 2 e - Pb (s) Ni 2+ (aq) + 2 e - Ni (s) Fe 2+ (aq) + 2 e - Fe (s) r +3 (aq) + 3 e - r (s) Zn +2 (aq) + 2 e - Zn (s) (l) + 2 e (aq) + 2 (g) Al 3+ (aq) + 3 e - Al (s) Faraday's constant 96,500 coul/mole e - Periodic Table of the Elements IA VIIIA (1) (18) 1 2 gas constant (R) L. atm/mol. K (2) J/mole. K (13) (14) (15) (16) (17) speed of light (c) 3.00 x 10 8 m/s specific heat of water (s) J/g Planck's constant 6.63 x J. s IIA IIIA IVA VA VIA VIIA e 2 Li Be B N F Ne Na Mg IIIB IVB VB VIB VIIB VIIIB IB IIB Al Si P S l Ar (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) K a Sc Ti V r Mn Fe o Ni u Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag d In Sn Sb Te I Xe s Ba La f Ta W Re s Ir Pt Au g Tl Pb Bi Po At Rn Fr Ra Ac Unq Unp Unh Uns e Pr Nd Pm Sm Eu Gd Tb Dy o Er Tm Yb Lu Th Pa U Np Pu Am m Bk f Es Fm Md No Lr

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