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230_F09_exam1_key - CHEM 230 F09 Exam 1 p1 Name For...

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CHEM 230 F09 Exam 1 p1 Name:_____________________ For questions 1-17, place the correct letter (or other information requested on you answer sheet.) 1) In an experiment a gas is heated up and gains 65 J of heat from the surroundings. As the gas heats up, it does work on the surroundings equal to 22J. What are q , w , and Δ U for the conditions described in this experiment? q = + 65 J w = -22 J Δ U = 43 J 2 each MC 4 each 2) Which of the following are TRUE: The behavior of a real gas is expected to deviate from that of an ideal gas when: (1) The temperature of the gas is very high. (2) The pressure of the gas is much higher than 1 atm. (3) The compression factor of the gas = 1. (4) Several different kinds of gases are present in the same container. A. (1) only B. (2) only C. (3) only D. (3) and (4) E. All are false 3) Based on the kinetic theory of gases, the rate of diffusion of N 2 at 25 o C would be _______ times that of CO 2 at 75 o C . 4) A marshmallow (which contains air trapped in tiny cells in its elastic carbohydrate structure) is placed inside a glass container. A vacuum pump connected to the container is used to remove air from the container. What change if any is observed in the marshmallow? A. It is compressed and gets smaller. B. It expands and gets larger C. It stays the same size. V rms α√Τ / Μ N 2 = 298/28 = 3.26 CO 2 = 348/44 = 2.81 3.26/2.81 = 1.16
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CHEM 230 F09 Exam 1 p2 Name:_____________________ 5) Assuming that the same mass of each element/compound listed below is used to fill a balloon at the atmospheric pressure and room temperature. The balloon containing which element/compound will be the largest? 6) To which series of molecules below would you assign the ordered sequence of van der Waals a and b parameters. It may help you to know that a for HCl is 3.716 and for HBr is 4.510. a (bar L 2 mol -2 ) 19.74 22.90 27.27 b (L mol -1 ) 0.1281 0.1485 0.1642 A CCl 4 GeCl 4 SnCl 4 B SnCl 4 GeCl 4 CCl 4 C GeCl 4 CCl 4 SnCl 4 D SnCl 4 CCl 4 GeCl 4 7) How many grams of water must undergo the process: H 2 O (g, 100 o C) H 2 O (l, 90 o C) In order to produce 100.0 kJ of heat? Δ H vap (H 2 O, 3 7 3 K) = 40.7 kJ/mol C m (steam) = 36.3 J mol -1 K -1 C s (water) = 4.184 J g -1 o C -1 8) In the chart below, two processes are described. The first is a melting from a more dense solid to a less dense liquid. The second is the adiabatic expansion of an ideal gas. For each process, determine if q, w, Δ U, Δ T , and Δ S are positive, negative or zero. Place a “+,” “-,” or “0” in the appropriate box in the table.
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