110 Fa07 ex3 A

110 Fa07 ex3 A - Chemistry 110 Exam III Form A November 12,...

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Chemistry 110 Name _______________________ Exam III Form A Section _______________________ November 12, 2007 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 28 points. Your score will be reported in percents (max 100%). Exam policy Calculators with text-programmable memory 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.
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CHEMISTRY 110 EXAM 3 November 12, 2007 FORM A ---------------------------------------------------------------------------------------------------------- 1. A sample of aluminum metal absorbs 9.86 J of heat, upon which the temperature of the sample increases from 23.2°C to 30.5°C. What is the mass of the sample if the specific heat capacity of aluminum is 0.90 J/g-K? A. 1.5 g B. 6.6 g C. 8.1 g D. 65 g E. 72 g ---------------------------------------------------------------------------------------------------------- 2. What is the property responsible for the “beading up” of water on a waxed car? A. density B. viscosity C. vapor pressure D. surface tension E. boiling point ---------------------------------------------------------------------------------------------------------- 3. What is the vapor pressure of a substance at its normal boiling point? A. 1 Pa B. 1 torr C. 1 atm D. equal to atmospheric pressure E. equal to the vapor pressure of water ---------------------------------------------------------------------------------------------------------- 4. Carbon dioxide contributes to the greenhouse effect by _____________. A. undergoing very exothermic reactions in the troposphere. B. preventing the formation of acid rain. C. absorbing infrared radiation that is emitted from the earth’s surface. D. photodissociating into C(g) and O 2 (g). E. helping to produce more ozone in the upper stratosphere. ----------------------------------------------------------------------------------------------------------
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---------------------------------------------------------------------------------------------------------- 5. The process indicated by the arrow in the phase diagram below is a temperature increase at constant pressure. Select the correct phase change and enthalpy change
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110 Fa07 ex3 A - Chemistry 110 Exam III Form A November 12,...

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