spring 2006 exam - CHEM 4:012 PRINCIPLES OF CHEMISTRY II...

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CHEM 4:012 – PRINCIPLES OF CHEMISTRY II EXAM #2 (30 QUESTIONS, 1½ HOURS) 23-March-2006 FORM A R = 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 1. Which one of the following solutions would have the highest pH? (A) 0.10 M HCl (B) 0.10 M NaOH (C) 0.10 M CH 3 COOH (D) 0.10 M NH 3 (E) pure water 2. Which of the following pH values is closest to the observed value for a solution that is 10 10 M HCl? (A) 10 (B) 10 (C) 7 (D) 9 (E) 5 3. Which one of the following species could react as either a Brønsted acid or a Brønsted base? (A) H (B) SO 4 2 (C) CH 4 (D) NH 4 + (E) HPO 4 2 4. Beer’s Law relates the concentration of a species to a measured absorbance. Using this relationship, typical units on molar absorptivity are (A) cm 1 (B) L mol 1 (C) mol cm L 1 (D) mol L 1 cm 1 (E) L mol 1 cm 1
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2 5. For the titration of a weak acid with a strong base, the pH at the equivalence point (A) is smaller than 7. (B) is greater than 7. (C) is equal to 7. (D) depends on the K b of the conjugate base. (E) depends on the indicator used. 6. A 1.0 M solution of a weak acid with pK a = 8.0 will have a pH of approximately (A) 2 (B) 4 (C) 6 (D) 8 (E) 10 7. For the reaction, A + 2 B C + D, the following data were collected at constant temperature: Experiment Initial [A] (mol/L) Initial [B] (mol/L) Initial Rate (mol/L s) 1 0.10 0.10 0.050 2 0.10 0.20 0.10 3 0.20 0.40 0.20 What is the rate constant, k, for this reaction? (A) 10. L / mol·s (B) 5.0 L / mol·s (C) 1.0 s 1 (D) 0.50 s 1 (E) Insufficient data is provided to answer this question. 8. Diet colas typically have a pH of about 3.0, while milk has a pH of about 7.0. The H 3 O + concentration in diet cola compared to that in milk is (A) 10,000 times higher in diet cola (B) 1000 times higher in diet cola (C) 400 times higher in diet cola (D) 2.3 times higher in diet cola (E) 2.3 times higher in milk
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3 9. Which analyte and titrant resulted in the titration curve on the right? The original volume and concentration of the analyte were 50.00 mL and 0.100 M, respectively. (A) weak base (pK
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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 2006 exam - CHEM 4:012 PRINCIPLES OF CHEMISTRY II...

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