Ch221 Fall 2009 Exam 2 key

Ch221 Fall 2009 Exam 2 key - Version A Chemistry 221 Fall...

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Version A Chemistry 221 Fall 2009 Midterm 2 Write you name on the back of the last page. 1. ______ ( 15 pts) 2. ______ ( 15 pts) 3. ______ ( 10 pts) 4. ______ ( 10 pts) 5. ______ ( 10 pts) 6. ______ ( 10 pts) 7. ______ ( 15 pts) 8. ______ ( 15 pts) 9. ______ ( 9 pts) __________ Total (100 pts)
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1. A 25.00 mL sample of nitric acid solution requires 14.16 mL of 0.106 M potassium hydroxide for complete neutralization. a) Write the balanced chemical reaction for this neutralization? Be sure to include states. HNO 3(aq) + KOH (aq) KNO 3(aq) +H 2 O (l) b) What is the concentration of the original nitric acid solution in units of molarity? 0.0600 M 2. For how many electrons in Ca does a. n = 4, l = 0, m l = 0, m s = +½ 1 or 0 acccepted b. n = 3, l = 1 6 c. n = 3, l = 2, m l = 1 2 or 0 accepted d. How many valence electrons in Ca? 2 e. Write the electron configuration for calcium using the noble gas notation. [Ar] 4s 2 f. Provide the symbol for a neutral atom or ion that isoelectronic to Ca 2+ . Anything w/ 18 e -
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3. a)
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Ch221 Fall 2009 Exam 2 key - Version A Chemistry 221 Fall...

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