final_132_2016 v3.pdf - Chemistry 132 Final Examination May 6 2016 Name(PRINT Student ID number Workshop Leader You have up to 120 minutes to work this

final_132_2016 v3.pdf - Chemistry 132 Final Examination May...

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Chemistry 132 Final Examination May 6, 2016 Name ( PRINT)____________________________ Student ID number_________________________ Workshop Leader__________________________ You have up to 120 minutes to work this exam. Please be sure that you have a complete exam package (19 pages long with problems on pp. 3-16.) Please work exam problems on the pages provided and use the back of the pages if necessary. If you need additional space to complete a problem, please write a note telling us where to look for your solution. Completely turn off your cell phones and other devices and store them in your bag. If you do not have anywhere to store your personal electronic devices, then give them to the exam proctor for safe keeping until the end of the exam. You will receive maximum credit for each problem if you: Work neatly Show your work Circle your answers Indicate proper units *****Required*****: Please write out the Honor Pledge for Exams and sign your name below. “I affirm that I will not give or receive any unauthorized help on this exam, and that all work will be my own.” ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ Signature ______________________________________
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Name_____________________ Points on page 2:______________ 2 Page problem Your Score Out of 3 Heat and Work 1 12 4 Heat capacity 2 16 5 Heat capacity and Entropy 2 cont’d 18 6 Delta G and Equilibrium Constants, Temp dependence 3 20 7 Electrochemistry 4 23 8 Electrochemistry cont’d 4 cont’d 7 9 Kinetics and Reaction Mechanisms 5 20 10 Radiocarbon dating 6 13 11 Lewis Dots and Molecular shapes 7 35 12-15 Multiple Choice Questions 8 39 16 Short Answers 9 6 TOTAL POINTS 209 PERCENTAGE 100%
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Name_____________________ Points on page 3:______________ 3 1. Heat and Work (12 points) a) (6 points) A balloon containing 4 moles of ethane (C 2 H 6 ) is cooled from 350 K to 300 K at 1.0 atm pressure. What is the work done on the balloon, w? b) (6 points) The heat capacity C p for ethane is 52.9 J / (mole K). Calculate the heat absorbed (q), the enthalpy change Δ H and the energy change Δ E for the gas.
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Name_____________________ Points on page 4:______________ 4 2. Thermodynamics: Heat and Entropy (34 points) 200 g of ice at -10° C is added to 1000 g of room temperature (23° C) water, in a well insulated container. We will analyze the heat flow and entropy changes in this system in three steps: (1) The process by which the ice heats up to 0° C but does not melt, (2) the process of melting the ice, and (3) the process by which the final equilibrium is established. Specific heats: c(water) = 4.19 J g -1 K -1. c(ice) = 2.05 J g -1 K -1 Heat Capacities: C(water) = 75.3 J mol -1 K -1. C(ice) = 38.0 J mol -1 K -1 Enthalpy of Fusion for ice/water: Δ H fusion = 6.0 kJ/mol (a) (8 points) Step 1: At the point when the ice has warmed up to 0°C but has not yet melted, what temperature will the liquid water be? (b) (8 points) Step 2: Now the ice at 0° C melts, but its temperature does not change. What is the temperature of the 1000 g of water once all the ice is melted?
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Name_____________________ Points on page 5:______________ 5 (c) (8 points) Step 3: Lastly, the system will reach thermal equilibrium. What is the final temperature of all the water when it reaches equilibrium?
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