sample exam 4 solutions

sample exam 4 solutions - mao (tm23477) Sample Exam Four...

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Unformatted text preview: mao (tm23477) Sample Exam Four Shear (52375) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. DrRuth says: In all cases, select the answer that BEST answers the question asked. Read the whole thing first and plan which to answer first because you feel confident about them. Notice the harder ones and save them up till last so you dont use up all your time working on them. Shear 52375 1 L atm = 101.325 J 1 cal = 4.184 J R = see back of answer sheet 001 10.0 points An isolated system can only exchange energy with the surroundings. 1. True 2. False correct Explanation: An isolated system cannot exchange energy nor matter with the surroundings. 002 10.0 points Which one of the following thermodynamic quantities is NOT a state function? 1. work correct 2. enthalpy 3. entropy 4. internal energy 5. free energy Explanation: Internal energy ( E ), free energy ( G ), en- thalpy ( H ) and entropy ( S ) are state func- tions. They are independent of path and are dependent solely on the initial and final states. Work is not a state function. It is dependent on the process or pathway. 003 10.0 points Which of the following statements does NOT concern the First Law of Thermodynamics? 1. The energy of the universe is constant. 2. Energy cannot be created nor destroyed. 3. Spontaneous changes lead to more uni- versal disorder. correct 4. Energy can be transformed but never made from scratch. Explanation: The First Law of Thermodynamics states that the total amount of energy in the uni- verse is constant. Energy cannot be created nor destroyed, but it can be transferred and it can change form. The Second Law of Ther- modynamics addresses spontaneity. 004 10.0 points You have a 12 oz. can (355 mL) of beer. You test the temperature and see that it reads 0 C. Now this isnt just any beer; this is Guinness and youve heard that Guinness is best at room temperature (20 C). If the specific heat of Guinness is 4.186 J / g C, how much heat should you add in order to raise the tempera- ture? The density of Guinness is 1.2 g/mL. 1. 35.6 kJ correct 2. 33.6 J 3. 33.6 kJ 4. 83 J Explanation: 005 10.0 points Which of O 2 (g) , O 2 ( ) , H 2 (g) , H 2 ( ) , H 2 O(g) , H 2 O( ) have a heat of formation equal to zero? mao (tm23477) Sample Exam Four Shear (52375) 2 1. All of them, but only at absolute zero 2. O 2 (g), H 2 (g) correct 3. O 2 (g), H 2 (g), H 2 O(g) 4. O 2 (g), O 2 ( ), H 2 (g), H 2 ( ), H 2 O(g), H 2 O( ) 5. O 2 (g), O 2 ( ), H 2 (g), H 2 ( ) Explanation: Molecules in their native state at STP have a heat of formation of zero....
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This note was uploaded on 05/12/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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sample exam 4 solutions - mao (tm23477) Sample Exam Four...

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