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230_F09_E3_key - CHEM 230 Fall 2009 Exam 3(1.5 hours...

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CHEM 230 Fall 2009 Name:______________________________ Exam 3 (1.5 hours) December 9, 2009 ID:_________________________________ Signature:___________________________ Please check your discussion section: M 8 202 Shan CHEM 1632 Th 3 109 Jessica USB 3230 M 9 204 Ashley CHEM 1628 Th 4 106 Jessica USB 3230 W 10 201 Anette Denn 430 F 10 102 Ashley CHEM 1628 Th 9 108 Jessica CHEM A863 F 12 101 Ashley 213 Denn Th 11 107 Shan CHEM 1650 F 2 206 Bo CHEM 1632 Th 12 103 Shan CHEM 1632 F 3 105 Bo CHEM 1628 Th 2 104 Bo CHEM A859 F 3 203 Anette CHEM 1632 Only non-programmable calculators may be used on the exam. For Q1-8, please circle the correct answer. For the free response problems (I-VI), please neatly show your work and place your answers in the boxes if provided. Neatness is important especially for awarding partial credit. Q 1-8 _______ / 48 I _______ / 28 II _______ / 10 III _______ / 14 IV _______ / 25 V _______ / 15 VI _______ / 10 Total _______ / 150
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CHEM 230 F09 Exam 3 Name:________________________ Clearly circle the one correct answer for each question #1-8. 1) Which of the following mixtures gives a buffer with a pH greater than 7.0? For HCNO, K a = 2.2x 10 –4 and for NH 3 , K b = 1.8x10 –5 . A) 10 mL of 0.1 M NH 3(aq) + 10 mL of 0.1 M HCl (aq) B) 10 mL of 0.1 M HCNO (aq) + 10 mL of 0.1 M NaCNO (aq) C) 10 mL of 0.1 M HCNO (aq) + 5.0 mL of 0.1 M NaOH (aq) D) 10 mL of 0.1 M NH 3(aq) + 10 ml of 0.1 M HCNO (aq) E) 10 mL of 0.1 M NH 3(aq) + 5.0 mL of 0.1 M HCl (aq) 2) Consider the titration of 15.0 mL of 0.200 M H 3 PO 4(aq) with 0.200 M NaOH (aq) . What is/are the major species in solution after the addition of 30.0 mL of base? 3) How many grams of copper will be plated out of a CuBr solution if a current of 1.5 A is applied for 2.5 hours.? A) 0.003 g B) 8.9 g C) 13.9 g D) 17.8 g
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