110211_Exam1_answer_final2

110211_Exam1_answer_final2 - Chem340 Physical Chemistry for...

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1 Chem340 Physical Chemistry for Biochemists Exam 1 Feb 11, 2011 Your Name _ I affirm that I have never given nor received aid on this examination. I understand that cheating in the exam will result in a grade F for the class. Signature . Sec 1 Multiple Choice [ /42] Sec 2 Calculation/MC [ /24] Sec 3 Long Question [ /40] Sec 4 Derivation [ /10] Total [ /100] Total points are 124 points. If you score more than 100, you will receive 100 points.
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2 Multiple Choice Questions (Some questions may be similar to those one in quiz, but not the same) Each 3 points [ /42] Q1 . Which of the following P-V cycles has the largest work in absolute value (namely, |w| )? Assume that P ext = P int . Choose all the correct answers . (a) [P (bar),V (L) ] [1, 1] [1, 3] [3, 3] [3, 1] [1, 1] (b) [P (bar),V (L) ] [1, 1] [3, 1] [3, 3] [1, 3] [1, 1] (c) Isothermal compression from [P (bar),V (L)] of [3, 1] to [1, 3] and then isothermal expression from [1, 3] to [3, 1] (d) Isothermal compression from [P (bar),V (L)] of [1, 3] to [3, 1]. Then, [P,V] =[3, 1] [3, 3] [1, 3] Q2. Select two correct statements from the following choices. (a) “Equilibrium” means the situation in which a system parameter reaches constant over time in any part of the systems (b) “Equilibrium” means the situation in which a system parameter reaches constant over time in some parts of the systems (c) The zeroth law of thermodynamics states that when two systems are separately in thermal equilibrium with the third system, these two systems are also in thermal equilibrium (d) The first law of thermodynamics is equivalent to the fact that no heat is generated in the reversible process. (e) In a reversible process, P ext = -P int Q3. Calculate the average translational energy <mv 2 /2> for one molecule of H 2 O assuming that it is an ideal gas, where m is a mass of the molecule and v is a velocity. Choose the closet from the choices (a- h) below. (a) 0, (b) RT/2 (b) k B T/2 (c) RT (d) k B T (e) 3RT/2 (f) 3k B T/2 (g) 3RT (h) 3k B T Q4. What is expected heat capacity at a constant volume C V per one mole of CO at T = 200K (neglecting the vibrational energy)? Choose the closest. (a) 0 (b) 3RT/2 (c) 3k B T/2 (d) 3R/2 (e) 3k B /2 (f) 5RT/2 (g) 5k B T/2 (h) 5R/2 (g) 5k B /2 (h) 3RT (i) 3k B T (j) 3R (e) 3k B Q5. A total differential of H, dH is given in the following form when P and T are independent variables: BdT AdP dH . Which of the following statement is correct on A and B? Select ALL choices that are correct. (a) A is 0 for an ideal gas (b) B is zero for an ideal gas (c) A = ( H/ P) T (d) B = ( H/ T) P (e) A= P T V T V (f) B= P T V T V (g) B = C V (h) B = C p (i) Pfin Pin T dP T P B U ) , (
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3 0 2 4 6 8 10 10 20 30 40 50 60 70 80 90 100 110 120 130 V [L] p [bar] p 1 V i p i V 2 p i V i Q6. Which are generally correct equations? Choose ALL that are correct. (a) T T P V V P / 1 (b) P H V V H V P P H (c) 1
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This note was uploaded on 03/06/2011 for the course CHEM 340 taught by Professor Staff during the Spring '08 term at Ill. Chicago.

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110211_Exam1_answer_final2 - Chem340 Physical Chemistry for...

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