S06-ex3-A-post

S06-ex3-A-post - Chemistry 12 Exam 3 Form A April 5, 2006...

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1 Chemistry 12 Name _______________________ Exam 3 Form A Section _______________________ April 5, 2006 Student No._______________________ IMPORTANT : On the scantron (answer sheet), you MUST clearly fill your name , your student number , section number , and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. There are 28 questions on this exam. Check that you have done all of the problems and filled in the first 28 bubbles on the scantron. The exam contributes maximum 35 points to the course grade. Your score on the exam will be reported in percents (max 100%). Exam policy No electronic devices, except for simple scientific calculators are allowed (specifically calculators with text-programmable memory or communication capabilities are not allowed). Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your score will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (under "News"). Hints As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing. 2 Chem 12, Exam 3 April 5, 2006 Form A --------------------------------------------------------------------------------------------------------------------- 1. A 100.0 L flask contains a mixture of NO 2 gas and CO gas. If the concentration of NO 2 is 5.5 x 10 5 ppm, and the total pressure is 790 torr, what is the partial pressure of CO in the flask? A. 356 torr B. 435 torr C. 0.559 atm D. 790 torr E. 1.52 atm --------------------------------------------------------------------------------------------------------------------- 2. The following figure may represent speed distributions of different gases at one temperature, or one gas at different temperatures. Which of the following statements is false ? A. If all gases are at the same temperature, gas IV has the smallest molecular mass. B. If all gases are at the same temperature, the average kinetic energy of gas I is less than that of gas II. C. If the same gas is shown at different temperatures, curve I corresponds to the lowest temperature. D. If the same gas is shown at different temperatures, the largest fraction of molecules moving with a speed of 1000 m/s is at temperature III. E. If all gases are at the same temperature, molecules of gas IV have the largest average speed. --------------------------------------------------------------------------------------------------------------------- 3. Under which conditions is Ar(g) most likely to approach ideal behavior? A. 10 atm and 100°C B. 1.0 atm and 0°C C. 0.10 atm and –100°C D. 1.0 atm and 100°C E. 0.10 atm and 100°C ---------------------------------------------------------------------------------------------------------------------
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3 --------------------------------------------------------------------------------------------------------------------- 4. An unknown gas is found to effuse at a rate that is 1.864 times faster than Br 2 at the same temperature. What is the identity of the gas?
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This note was uploaded on 05/24/2009 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Penn State.

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S06-ex3-A-post - Chemistry 12 Exam 3 Form A April 5, 2006...

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