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Unformatted text preview: Guerra, Thomas – Homework 10 – Due: Nov 21 2007, 6:00 pm – Inst: Vandenbout 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points On January 1, 2001, a bookstore had 266,478 books in stock. On February 1, 2001, the same bookstore had 257,814 books in stock. What is the value of Δ(books) for the bookstore during that period? Answer in units of books. 002 (part 1 of 1) 10 points Work is 1. heat. 2. organized molecular motion. 3. potential energy. 4. chaotic molecular motion. 5. kinetic energy. 003 (part 1 of 1) 10 points A chemical reaction takes place in a container of cross-sectional area 100 cm 2 . As a result of the reaction, a piston is pushed out through 13 cm against an external pressure of 551 torr. What is the value for w for this reaction? (Sign does matter.) Answer in units of J. 004 (part 1 of 1) 10 points A 100 W electric heater (1W = 1J / s) oper- ates for 10 . 5 min to heat the gas in a cylinder. At the same time, the gas expands from 2 L to 8 L against a constant atmospheric pressure of 4 . 091 atm. What is the change in internal energy of the gas? Answer in units of kJ. 005 (part 1 of 1) 10 points A system had 150 kJ of work done on it and its internal energy increased by 60 kJ. How much energy did the system gain or lose as heat? 1. The system gained 90 kJ of energy as heat. 2. The system gained 60 kJ of energy as heat. 3. The system lost 90 kJ of energy as heat. 4. The system lost 210 kJ of energy as heat. 5. The system gained 210 kJ of energy as heat. 006 (part 1 of 1) 10 points When 2.00 kJ of energy is transferred as heat to nitrogen in a cylinder fitted with a piston at an external pressure of 2.00 atm, the nitro- gen gas expands from 2.00 to 5.00 L againstgen gas expands from 2....
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This note was uploaded on 05/06/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.
- Spring '07