F05-ex3A - Chemistry 12 Exam III Form A Name Section...

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1 Chemistry 12 Name _______________________ Exam III Form A Section _______________________ November 16, 2005 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 maximum score on this exam is 35 points. Your score 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 grade 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 CHEMISTRY 12 EXAM 3 NOVEMBER 16, 2005 FORM A --------------------------------------------------------------------------------------------------------- 1. The specific heat of liquid bromine is 0.226 J/g-K. How much heat is needed to raise the temperature of 10.0 mL of bromine from 25.00 °C to 27.30 °C? The density of liquid bromine is 3.12 g/mL. A. 5.20 J B. 10.4 J C. 16.2 J D. 32.4 J E. 300 J --------------------------------------------------------------------------------------------------------- 2. Which statement(s) about viscosity is/are true? I The viscosity of a pure liquid increases as temperature decreases. II The viscosity increases as molecular cohesive forces decrease. III The viscosity increases as intermolecular forces increase. A. I only B. II only C. I and III D. None of them are true E. I, II, and III --------------------------------------------------------------------------------------------------------- 3. The composition of noble gases in the atmosphere at sea level is given in the table below. If barometric pressure on a sunny day at the sea is 754 torr, what is the total pressure of the noble gases? X i (mole fraction) ppm Ar 0.00934 9340 Ne 0.00001818 18.18 He 0.00000524 5.24 Kr 0.00000114 1.14 Xe 0.00000009 0.09 A. 0.0186 torr B. 7.06 torr C. 70.4 torr D. 704 torr E. 754 torr ---------------------------------------------------------------------------------------------------------
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3 --------------------------------------------------------------------------------------------------------- 4. Which one of the following heating curves corresponds to the processes occurring when a substance starts in the state represented by the point labeled I (for initial) and ends at the point
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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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F05-ex3A - Chemistry 12 Exam III Form A Name Section...

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