125pex1 - Copyright RJZ 1/27/12 1 no unauthorized use...

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Copyright RJZ 1/27/12 1 no unauthorized use allowed Chemistry 125 - W12 Practice Midterm 1 This material is copyrighted. Any use or reproduction is not allowed except with the expressed written permission of Dr. Zellmer. If you are taking Chem 125 you are allowed to print one copy for your own use during the quarter you are taking Chem 125 with Dr. Zellmer. You are not allowed to disseminate this material to anyone else during the quarter or in the future.
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Copyright RJZ 1/27/12 2 no unauthorized use allowed 1. Two flasks are connected by a stopcock. Both flasks are held at the same temperature. The 2.00 L flask is filled with O 2 at a pressure of 1456 mm Hg. The 5.00 L flask was evacuated (contains no gas). The stopcock is opened and the oxygen fills both flasks. What is the pressure (in mm Hg) of the O 2 now? a) 5096 b) 1040 c) 582 d) 416 e) 370 2. Consider a cylinder fitted with a movable piston that can expand against the atmosphere. The initial pressure, volume and absolute temperature inside the cylinder are P i , V i and T i . What is the new temperature of the system when the pressure is doubled and the volume is decreased to one third of the original volume? a) (4/9) T i b) 6 T i c) (3/2) T i d) (1/6) T i e) (2/3) T i 3. The average temperature in interstellar space is 10 K. If there is only 1 hydrogen atom in a volume of 1 m 3 , what is the pressure (in torr ) in interstellar space? (1 m 3 = 10 3 L) a) 1.0 x 10 -24 b) 1.0 x 10 -23 c) 1.4 x 10 -25 d) 1.4 x 10 -26 e) 3.2 x 10 -23
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Copyright RJZ 1/27/12 3 no unauthorized use allowed 4. A 389-mL flask contains 0.0188 mol of an ideal gas at a given temperature and pressure. Another flask contains 0.0243 mol of the same gas at the same temperature and pressure. What is the volume (mL) of the second flask? a) 120 b) 220 c) 389 d) 450 e) 503 5. A 0.738 g sample of SF x has a volume of 199 mL at 745 mm Hg and 75°C. What is the value of x? (atomic weights: S = 32.06, F = 19.00) a) 1 b) 2 c) 3 d) 4 e) 6 6. The atmosphere in a sealed diving bell at 3.00 atm contains oxygen and helium. If the partial pressure of helium is 2.80 atm., what is the mass (g) of oxygen in 1.0 L at 20°C? (atomic weights: He = 4.00, O = 16.00) a) 0.27 b) 2.7 c) 0.32 d) 4.7 e) 0.47
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Copyright RJZ 1/27/12 4 no unauthorized use allowed 7. Five identical 1.0-L flasks contain the following gases each at 0°C and 1 atm pressure. Which gas has the GREATEST density ? (atomic weights: H = 1.008, C = 12.01, N = 14.01, F = 19.00, Ne =20.18) a) Ne b) CH 4 c) F 2 d) NH 3 e) C 2 H 4 8. What is the order of INCREASING rate of effusion for the following gases at constant temperature (from smallest rate to largest rate)? (At. wts.: N = 14.01, O = 16.00, Ne = 20.18, S= 32.06, Ar = 39.95) Ar, SO 2 , Ne, N 2 a) SO 2 < Ar < N 2 < Ne b) Ar < SO 2 < Ne < N 2 c) Ar < Ne < SO 2 < N 2 d) SO 2 < N 2 < Ar < Ne e) N 2 < Ar < SO 2 < Ne 9. Which one of the following statements does NOT describe ideal gases? a) The average kinetic energies of molecules of different kinds of gases are the same at a given temperature. b) Under ordinary conditions of temperature and pressure, gas molecules are widely separated.
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This note was uploaded on 02/19/2012 for the course CHEM 125 taught by Professor Zellmer during the Winter '08 term at Ohio State.

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125pex1 - Copyright RJZ 1/27/12 1 no unauthorized use...

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