spring exam final - CHEM 4:012 PRINCIPLES OF CHEMISTRY II...

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Q log n 05916 . 0 E E 10 cell cell = D CHEM 4:012 – PRINCIPLES OF CHEMISTRY II FINAL EXAM (40 QUESTIONS, 2 HOURS) 10-May-2006 FORM A Equations and Constants R = 0.082056 L·atm/mol·K = 8.314 J / K·mol ) A A ( ) A A ( ] F [ 1 K 100 o eq = = 1 2 a 1 2 T 1 T 1 R E k k ln + = ] acid [ ] base [ log pK pH 10 a S = k·ln W G = H – T S (constant temp.) G = Gº + RTln Q 1. 100.0 mL of aqueous HCl with a pH of 1.00 is mixed with 100.0 mL of aqueous HCl with a pH of 2.00. What is the pH of the resulting mixture? (Hint: this is not a trivial problem.) (A) 1.50 (B) 0.96 (C) 1.26 (D) 3.00 (E) 1.00 2. The polymer segment shown represents the polymer named (A) polyethylene (B) polypropylene (C) polybutylene (D) polystyrene (E) polyacrylonitrile 1 2 k m ν π = k ln(2) t 1/2 = t k o N t N ln = CH CH 2 CH CH 2 CH CH 2 CH CH 2 CH 3 CH 3 CH 3 CH 3
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2 3. The compound K 3 [Fe(CN) 6 ] is used in calico printing and wool dyeing. Give its systematic name. (A) potassium iron(III) hexacyanate (B) tripotassium iron(III) hexacyanate (C) potassium hexacyanoferrate(III) (D) potassium hexacyanideferrate (E) none of these choices is correct 4. Which one of the following is considered a Lewis acid? (A) CH 3 NH 2 (B) BCl 3 (C) F (D) BF 4 (E) CH 4 5. Select the nuclide that completes the following nuclear reaction: (A) (B) (C) (D) (E) 6. A solution is prepared by adding 100 mL of 0.2 M hydrochloric acid to 100 mL of 0.4 M sodium formate. Is this a buffer solution, and if so, what is its pH? (A) It is a buffer, pH > pK a of formic acid. (B) It is a buffer, pH < pK a of formic acid. (C) It is a buffer, pH = pK a of formic acid. (D) It is a buffer, pH = pK b of sodium formate. (E) Since hydrochloric acid is a strong acid, this is not a buffer. 7. In the liquid state, which one of the following substances resembles water, insofar as it dissolves many electrolytes and undergoes autoionization? (A) N 2 (B) Cl 2 (C) NH 3 (D) N 2 O (E) Ne
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3 8. How many unpaired electrons will there be in a high-spin octahedral complex of Fe(II)? (A) 0 (B) 2 (C) 4 (D) 6 (E) none of these choices is correct 9. The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 15% of a sample of cyclopropane is converted to propene in 6.8 minutes. What is the half-life of cyclopropane at 760 K? (A) 3.4 × 10 2 min (B) 2.5 min (C) 23 min (D) 29 min (E) 230 min 10. For which one of the following reactions is S of the system positive? (A) Ag + (aq) + Cl (aq) AgCl(s) (B) CO 2 (g) CO 2 (s) (C) 2 H 2 (g) + O 2 (g) 2 H 2 O(g) (D) CaO(s) + CO 2 (g) CaCO 3 (s) (E) 2 SO 3 (g) 2 SO 2 (g) + O 2 (g) 11. The gas-phase reaction CH 3 NC CH 3 CN has been studied in a closed vessel, and the rate equation was found to be: rate = −∆ [CH 3 NC] / t = k [CH 3 NC]. Which one of the following actions is least likely to cause a change in the rate of the reaction?
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This note was uploaded on 05/08/2008 for the course CHEM 4:12 taught by Professor Larsen during the Spring '08 term at University of Iowa.

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spring exam final - CHEM 4:012 PRINCIPLES OF CHEMISTRY II...

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