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hw 5 kns - sommers(kns657 Homework 5 Thermodynamics I...

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sommers (kns657) – Homework 5: Thermodynamics I – Shear – (52375) 1 This print-out should have 11 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 Which of the following statements is true about an exothermic reaction? 1. The energy of the products is higher than that of the reactants. 2. The change in enthalpy is positive. 3. Heat is evolved during the reaction. 4. We can determine the absolute heat con- tent of the products and reactants. 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 sys < 0 6. Δ E univ < 0 004 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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