107FIN08Akey

107FIN08Akey - Chemistry 107 Final Exam December 8 2008...

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Chemistry 107 Final Exam, December 8, 2008 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 x 18 x 4 x 19 x 5 x 20 x 6 x 21 x 7 x 22 x 8 x 23 x 9 x 24 x 10 x 25 x 11 x 26 x 12 x 27 x 13 x 28 x 14 x 29 x 15 x 30 x 16 x 31 x 17 x 32 x A B C D E A B C D E Part III Lab Final A B C D E 33 x 34 x 35 x 36 x 37 x
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Part I. NAME_________________________________________________ 1. (10 points) Metallic sodium reacts violently with water: 2 Na(s) + 2 H 2 O(l) 2 NaOH(aq) + H 2 (g) ΔH = –653 kJ/mol What is the final temperature of the product solution if a 1.00 g chunk of sodium is dropped into a cup containing 50.0 g of water? Assume a specific heat of 4.18 J/(g- ° C) for the solution, an initial temperature of 25.0 ° C, and no heat transfer between the solution the surroundings. q reaction = (–653 kJ/mol reaction)(1 mol reaction/2 mol Na)(1.0 g Na)(1 mol/23.0 g Na) = –14.2 kJ q solution = -q reaction = +14.2 kJ =+1.42x10 4 J +1.42x10 4 J = (50.0 g + 1.00 g)(4.18 J/g-C)(T - 25.0 C) T = 91.6 °C
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NAME_______________________________________________________ 2. (10 points) The apparatus shown consists of three bulbs, connected by stopcocks. When the bulbs are first filled, the temperature is 0 ° C . At this temperature: Bulb A contains CO 2 at a pressure of 2.13 atm and has a volume of 1.5 L. Bulb B is empty and has a volume of 1.0 L. Bulb C contains Ar at a pressure of 1.15 atm and has a volume of 2.00 L. On a day when the temperature is 25 ° C , the valves are opened. What is the total pressure inside the system after the stopcocks are opened and the gases freely mix? Assume the lines connecting the bulbs have zero volume.
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This note was uploaded on 02/26/2010 for the course CHE 107 taught by Professor Keister during the Spring '07 term at SUNY Buffalo.

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107FIN08Akey - Chemistry 107 Final Exam December 8 2008...

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