Chem 1 Exam 3 - Panjwani, Sameer Test 3 Due: Jul 26 2007,...

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Unformatted text preview: Panjwani, Sameer Test 3 Due: Jul 26 2007, 4:00 pm Inst: Fakhreddine/Lyon 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Consider the following statements: I) Real gases act more like ideal gases as the temperature increases. II) When n and T are constant, a decrease in P results in a decrease in V . III) At 1 atm and 273 K, every molecule in a sample of a gas has the same speed. IV) At constant T , CO 2 molecules at 1 atm and H 2 molecules at 5 atm have the same average kinetic energy. Which of these statements is true? 1. II and III only 2. I and IV only correct 3. I and II only 4. II and IV only 5. III and IV only Explanation: 002 (part 1 of 1) 10 points The density of the vapor of allicin, a compo- nent of garlic, is 1 . 14 g L- 1 at 125 C and 175 Torr. What is the molar mass of allicin? 1. 162 g mol- 1 correct 2. 869 g mol- 1 3. 21 . 6 g mol- 1 4. 50 . 8 g mol- 1 5. 273 g mol- 1 Explanation: 003 (part 1 of 1) 10 points Rank the following gases in order of increas- ing non-ideality due to intermolecular inter- actions: 1. He < N 2 < HCl < CF 4 2. He < N 2 < CF 4 < HCl correct 3. CF 4 < HCl < N 2 < He 4. HCl < CF 4 < N 2 < He Explanation: 004 (part 1 of 1) 5 points The vapor pressure of all liquids 1. decreases with the increasing volume of the container. 2. is the same at their freezing points. 3. increases with volume of liquid present. 4. is the same at 100 C. 5. increases with temperature. correct Explanation: As temperature (kinetic energy) increases, rate of evaporization increases and rate of con- densation decreases; therefore, vapor pressure will increase with increasing temperature. 005 (part 1 of 1) 10 points An oxygen tank kept at 20 C contains 28 moles of oxygen and the gauge reads 31 atm. After two weeks, the gauge reads 10 . 5 atm. How much oxygen was used during the two- week period? 1. 9.48 mol 2. 20.5 mol 3. 7.51 mol 4. 9.25 mol 5. 18 . 52 mol correct Explanation: Panjwani, Sameer Test 3 Due: Jul 26 2007, 4:00 pm Inst: Fakhreddine/Lyon 2 28 mol- 9 . 48 mol = 18 . 52 mol 006 (part 1 of 1) 10 points If the temperature of a sample of ideal gas is increased from 93 C to 186 C while the volume is kept constant, the pressure 1. will remain constant. 2. will increase by a factor of about 1 . 2541. correct 3. will be cut in half. 4. will double. Explanation: T 1 = 93 C = 366 K T 2 = 186 C = 459 K P V = n R T P T P 1 P 2 = T 1 T 2 = 366 K 459 K = 0 . 797386 P 1 = 0 . 797386 P 2 or P 2 = 1 . 2541 P 1 Therefore P 2 is 1 . 2541 times greater then P 1 ....
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Chem 1 Exam 3 - Panjwani, Sameer Test 3 Due: Jul 26 2007,...

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