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Unformatted text preview: galloway (jlg4528) – H11: Thermo 1 – mccord – (50960) 1 This printout should have 15 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. This homework really comes from sections 1 and 2 in Chapter 9. Also refer to your class notes from Dr. McCord. DO con tinue reading on through section 6 for next week (11/711/11). H12 will be a much big ger homework assignment. Also, WATCH for Learning Modules to be posted over the week end and due early next week  like on Tuesday morning. 001 10.0 points Work is 1. potential energy. 2. chaotic molecular motion. 3. kinetic energy. 4. organized molecular motion. correct 5. heat. Explanation: Work is organized molecular motion since it is displacement of a solid against a force. 002 10.0 points If a process is carried out at constant pressure P and the volume V of the system decreases, then Δ V is (negative, positive) and the work w is (negative, positive, zero). 1. negative; negative 2. negative; zero 3. positive; zero 4. negative; positive correct 5. positive; negative Explanation: Δ V = V f − V i < since V i > V f . Thus w = − P Δ V > since Δ V is negative. 003 10.0 points A chemical reaction takes place in a container of crosssectional area 100 cm 2 . As a result of the reaction, a piston is pushed out through 21 cm against an external pressure of 519 torr. What is the value for w for this reaction? (Sign does matter.) Correct answer: − 145 J. Explanation: 004 10.0 points The definition of internal energy is Δ U = q + w . Which of these three values are state func tions? 1. q and w , but only at constant volume 2. Δ U , but only at constant volume 3. q and w only 4. Δ U only correct 5. Δ U , q , and w Explanation: 005 10.0 points A 100 W electric heater (1 W = 1 J / s) oper ates for 15 min to heat the gas in a cylinder....
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This note was uploaded on 11/14/2011 for the course CHEMISTRY 50960 taught by Professor Dr.mccord during the Fall '11 term at University of Texas.
 Fall '11
 Dr.McCord

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