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104_S2010_E2a-answers - CHM104 Spring2010 Exam#2 FORMA...

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CHM104 Spring 2010 Exam #2 FORM A MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 250. mL sample of gas at 1.00 atm and 20.0°C has the temperature increased to 40.0°C and the volume increased to 500. mL. What is the new pressure? A) 1.87 atm B) 0.374 atm C) 2.14 atm D) 0.468 atm E) 0.534 atm 1) 2) A sample of helium has a volume of 480 mL at 47.0°C and 740 mm Hg. The temperature is lowered to 22.0°C and the pressure to 625 mm Hg. What is the new volume? 2) 3) How many grams of O 2 are contained in a 25.0 L sample at 5.20 atm and 28.0°C? 3) 4) What is the pressure in a 1.00 liter container of methane, CH 4 , that contains 40.0 g of the gas at 25.0°C? 4) 5) A mixture of the gases N 2 , O 2 , and He has a total pressure of 760 mm Hg. If the partial pressure of N 2 is 90 mm Hg and of O 2 is 270 mm Hg, What is the partial pressure of He? A) 400 mm Hg B) 120 mm Hg C) 760 mm Hg D) 1120 mm Hg E) 360 mm Hg 5) 6) Which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind? 6) 7) Which of the following cannot have hydrogen bonds? 7) 8) The amount of energy associated with changing a liquid into a gas is called the 8) 1
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9) A process or reaction which takes in heat from the surroundings is said to be A) endothermic. B) conservative. C) exothermic. D) isothermal. E) endergonic. 9) 10) P 4 (s) + 10 Cl 2 (g) 4 PCl 5 (s) Δ H =- 435.2 kcal Based on the reaction shown, which statement is true? 10)
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