107FIN09Akey-1

107FIN09Akey-1 - Chemistry 107 Final Exam, December 17,...

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Chemistry 107 Final Exam, December 17, 2009 page 1 of 18 PRINT NAME______________________________________________ Last First SIGNATURE__________________________________________________- Recitation Section_______ Recitation Instructor_________________________________ Check the time of meeting of your Rec/Lab section. Monday afternoon ____ Tuesday morning ____ Tuesday afternoon ____ Wednesday afternoon ____ Thursday afternoon ____ Thursday evening ____ Friday afternoon ____ There are 2 questions in Part I, 30 multiple choice questions in Part II, and 5 multiple choice questions in Part III, the Lab final, in addition to one page of equations and a Periodic Table with constants, for a total of 18 pages . Be sure you have a complete copy before you begin. Turn in ALL pages. Part I. Answer each question in the space provided on the page. You must show your work for credit. Parts II and III: For each question choose the one best answer. Indicate the letter corresponding to this answer in the proper space in the box on page 2. It is best to use pencil and erase completely any answers you want to change. Questions with more than one answer marked will be graded as incorrect. Do not leave any answers blank - guess if you don't know. Part I __________(20) Part II __________(180) Total (Lecture Final) __________(200) Part III (Lab Final) __________(25)
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version A NAME_______________________________________________________ Part II A B C D E A B C D E 3 18 4 19 5 20 6 21 7 22 8 23 9 24 10 25 11 26 12 27 13 28 14 29 15 30 16 31 17 32 A B C D E A B C D E Part III Lab Final A B C D E 33 34 35 36 37
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Part I. NAME_________________________________________________ 1. (10 points) When 50.0 mL of 0.400 M Ca(NO 3 ) 2 (aq) is added to 50.0 mL of 1.00 M NaF (aq), CaF 2 precipitates as shown in the net ionic equation below. The initial temperature of both solutions is 21.0 ° C. Assuming that the reaction goes to completion, that the mass of the final solution is 100.0 g and that the specific heat of the final solution is 4.18 J/g- ° C, calculate the final temperature of the solution. Ca 2+ (aq) + 2 F (aq) CaF 2 (s) ΔH = −11.5 kJ/mol Ca(NO 3 ) 2 is limiting reagent 1 point (0.0500 L)(0.400 M Ca(NO 3 ) 2 )(1 mol reaction/1 mol Ca(OH) 2 ) = 0.0200 mol reaction 2 points (0.0200 mol reaction)(-11.5 kJ/mol)(1000 J/kJ) = -230. J 3 points q solution = -q reaction = +230. J = (100.0 g)(4.18 J/C-g)(T-21.0 C) 4 points T = 21.6 ° C 1 point wrong significant figures -1 no unit -1 any math error -2
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NAME_______________________________________________________ 2. (10 points) A mixture of C 3 H 8 (g) and excess O 2 (g) is placed in a 1.0 L reaction vessel at 150.0 ° C and a total pressure of 3.00 atm. The mixture is ignited and it burns according to the balanced equation below. After reaction, the vessel is cooled to 150.0 ° C and the pressure of the mixture of product gases (O 2 (g) , CO 2 (g), and H 2 O(g)) is 3.40 atm. What is the partial pressure of each gas in the product mixture? C
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This note was uploaded on 12/17/2010 for the course CHEM 107 taught by Professor Thai during the Fall '10 term at SUNY Buffalo.

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107FIN09Akey-1 - Chemistry 107 Final Exam, December 17,...

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