CHM 131 Exam-I-2006

CHM 131 Exam-I-2006 - Chemistry 131-Krugh Professor Thomas...

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Chemistry 131-Krugh Exam I October 5, 2006 Professor Thomas R. Krugh Name __________________________________ _______________________________ (please print) (signature) UR ID. No. ____________________________ There are SIX questions on this exam. Please check to be sure you have a complete exam package. Please work exam problems on the pages provided. Show all your work neatly and circle your answers; credit is awarded for the work shown. If you need additional space to complete a problem, please tell us where to look for your solution. Question 1. (15 points) _____________ Question 2. (30 points) _____________ Question 3. (20 points) _____________ Question 4. (25 points) _____________ Question 5a. (13 points) _____________ Question 5b. (12 points) _____________ Question 6. (25 points) _____________ Bonus: My Recitation TA's name is: ____________ ______________ (2 points) _______________ (first name) (last name) Exam Total (140 points) _____________ The last page of the exam has a periodic table. Reference Data: H 1.008 S 32.07 One liter is 1000 mL Ru 101.1 P 30.97 One pound is 453.6 grams C 12.01 Cl 35.45 One pound is 16 ounces. N 14.01 K 39.10 One ton is 2000 lbs. O 16.00 Cu 63.55 Na 22.99 Mg 24.31 One mole of gas at STP = 22.4 L Ag 107.9 π 3.141592 Air is 19.8% oxygen
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Chemistry 131-Krugh Exam I Name: _________________________________ Page 2 of 10 Points on this page __________ 1. (15 points) Students discovered a crusty old specimen they thought might be a ‘gem’. If analysis of a 1.3100 gram sample gave the mass percentages shown below, determine the empirical formula of this material . Element Atomic Mass mass % in sample Flourine F 19.00 8.9071% Oxygen O 16.00 6.5631% Potassium K 39.10 20.621% Praseodymium Pr 140.9 16.513% Ruthenium Ru 101.1 47.395% You need only show sample calculations for this question.
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Chemistry 131-Krugh Exam I Name: _________________________________ Page 3 of 10 Points on this page __________ 2a. Fill in the blanks as appropriate (2 points each).
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This note was uploaded on 09/24/2008 for the course CHM 131 taught by Professor Krugh during the Fall '04 term at Rochester.

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CHM 131 Exam-I-2006 - Chemistry 131-Krugh Professor Thomas...

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