Exam3Cv1_103F09_KEY - exam #3-key

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WINGRAVE Chem103 EXAM 3Cv1 - KEY Fall, 2009 NAME _______________________________________ SECTION # ________ • Put your name and section # on page 1 of test. • Exam time is 3:30 to 5:30 pm. For full credit, turn your exam in on time. • No penalty for guessing, so don't leave any answers blank. • Leave all pages of your exam stapled together. You may lose credit for lost pages. On problems , show all your work for full and/or partial credit. • When you finish POSSIBLY USEFUL INFORMATION: h = 6.63 x10 - 34 J· sec M R = 0.08206 atm· L mole· K = 8.314 J mole· K E photon = + 2.18 x10 - 18 J ( ) 1 n ¦ 2 - 1 n i 2 é ë ê ê ù û ú ú M Water at 25°C Density of = 1.00 g mL NOMENCLATURE ( 2 pts each blank) Fill in blank with appropriate answer. SYMBOL NAME 1. KBrO 3 potassium bromate 2. sulfur trioxide 3. NH 2 - C O | | - NH 2 urea 4. aluminum nitride 5. arsenic phosphite MULTIPLE CHOICE (3 Points each) 6. __a__ What is the equivalent weight of ferric sulfide? a. 34.65 g eq b. 41.58 g eq c. 45.50 g eq d. 51.98 g eq e. 91.00 g eq
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WINGRAVE Chem103 EXAM 3Cv1 - KEY Fall, 2009 MULTIPLE CHOICE (3 Points each) Page Score 7. __c__ From the following choices, select the one 1 13/ that would be the most basic (least acidic). 2 12/ a. 0.1 M hydrochloric acid 3 12/ b. 0.1 M acetic acid 4 21/ c. 0.1 M sodium acetate 5 9/ d. 0.1 M ammonium chloride 6 14/ e. pure water 7 8/ 8. __a__ What is the pH of a buffer made by mixing 8 20/ 0.2 mole of NaNO 2 and 0.1 mole of 9 15/ HNO 2 pK a = 3.29 ( ) into 1 L of water? 10 - - - a. pH > 3.29 b. pH < 3.29 11 - - - c. pH = 3.29 d. pH = 7.0 12 - - - e. pH = 6.58 Total 124/ 9. __d__ Given three separate solutions containing equal concentrations of formic acid ( K a =1.7x10 - 4 ), phenol ( K a =1.3x10 - 10 ), and acetic acid ( K a =1.8x10 - 5 ), select the response that has the acids arranged in order of increasing ionization or dissociation at equilibrium. a. formic < phenol < acetic b. formic < acetic < phenol c. acetic < formic < phenol d. phenol < acetic < formic e. No response is correct. 10. __c__ What is the conjugate base for HS - ? a. H 2 S b. HS - c. S - 2 d. H 3 O + e. OH - 2
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WINGRAVE Chem103 EXAM 3Cv1 - KEY Fall, 2009 MULTIPLE CHOICE (3 Points each) 11. __c__ The reactions of perchloric acid ( HClO 4 ) and acetic acid (HOAc) in water can be written as: HClO 4 + H 2 O ® H 3 O + + ClO 4 - HOAc + H 2 O « H 3 O + + OAc 4 - From these reactions it can be concluded that: a. acetic acid is a stronger acid than perchloric acid.
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Exam3Cv1_103F09_KEY - exam #3-key

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