full_solutions_MT1_A_2006 - 2R03 Midterm 1A Thu Oct 12, '06...

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2R03 Midterm 1A – Thu Oct 12, ’06 - SOLUTIONS (1) This is version A. Please mark circle A for exercise 1 of the scantron sheet. (2) Which of the following statements is true? a. The specific heat capacity of a system is an extensive quantity b. The internal energy of a non-ideal mixture of ideal gases is equal to its kinetic energy c. The internal energy of an ideal mixture of non-ideal gases is equal to its kinetic energy d. All the statements above (a-c) are false Solutions: ( a) is false because specific properties are intensive; (b) is false because in a non-ideal mixture of the ideal gases A and B there are still significant A-B interactions and therefore U is not the same as K (i.e. kinetic energy); (c) is false because in an ideal mixture of the non-ideal gases A and B there are still significant A-A and B-B interactions and therefore U is not the same as K (i.e. kinetic energy) (d) is correct . (3) Which of the following statements is true? a. The internal energy of all closed systems is constant. b. An isolated system can exchange matter with its surroundings. c. A closed system which cannot exchange work with its surroundings is also isolated. d. All the above statements (a-d) are false Solutions: (a) is false because it mentions closed and not isolated systems. (b) is false because a isolated system cannot exchange matter. (c) is false because such closed system could still exchange energy with its surroundings in the form of heat. (d) is correct. (4) Which of the following statements is false? a. The universe is considered an isolated system in thermodynamics. b. The pressures of two devices at mechanical equilibrium are always equal c. The temperatures of two objects at thermal equilibrium are always equal. d.
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This note was uploaded on 07/06/2011 for the course CHEMISTRY CHEM 2R03 taught by Professor Giuseppemelacini. during the Spring '05 term at McMaster University.

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full_solutions_MT1_A_2006 - 2R03 Midterm 1A Thu Oct 12, '06...

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