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# hw13 - padilla(tp5647 HW13 Thermodynamics I shear(52375...

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padilla (tp5647) – HW13: Thermodynamics I – shear – (52375) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A closed system can exchange energy with the surroundings. 1. False 2. True 002 10.0 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. 003 10.0 points What is true about the first law of thermody- namics? 1. Δ E sys > 0 2. Δ E univ > 0 3. Δ E sys = 0 4. Δ E univ = 0 5. Δ E univ < 0 6. Δ E sys < 0 004 10.0 points A property that determines the direction of heat flow is 1. temperature. 2. combustion. 3. entropy. 4. calorie. 005 10.0 points Which of the following statements is true about an exothermic reaction? 1. We can determine the absolute heat con- tent of the products and reactants. 2. The change in enthalpy is positive. 3. Heat is evolved during the reaction. 4. The energy of the products is higher than that of the reactants. 006 10.0 points 3.5 g of a hydrocarbon fuel is burned in a ves- sel that contains 250. grams of water initially at 25.00 C. After the combustion, the temper- ature of the water is 26.55 C. How much heat is evolved per gram of fuel burned? 1. 73.5 J/g 2. 1263 J/g 3. 463 J/g 4. 143 J/g 5. 1105 J/g 6. 1764 J/g 7. 26555 J/g 8. 511 J/g 007 10.0 points Consider the following specific heats: copper, 0.384 J/g · C; lead, 0.159 J/g · C; water, 4.18 J/g · C; glass, 0.502 J/g · C. Which substance, once warmed, would be more likely to main- tain its heat and keep you warm through a long football game on a cold night?

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