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Exam2_key_W09 - Name ANSWER KEY Chem 230 Exam#2 Discussion...

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Name: ANSWER KEY Chem 230 Exam #2 March 10, 2009 Discussion Section #: INSTRUCTIONS: Use only the space provided to answer the questions. If you need more work space, start your answer on the back of a page and then write only your final answer in the space provided. Anything written in the margins and on the back of pages will not be graded. Make sure your final answer is clearly marked . Multiple choice: Mark all multiple choice clearly, by both circling the correct choice and writing the letter. Each multiple choice question is worth 3 points. Short answer: Most questions can be answered solely with numbers, equations/expressions, or short phrases. When asked to "explain" or "justify," use a maximum of two sentences or an annotated equation. If the question does not ask you to "explain" or "justify," you do not need to do so. Inclusion of excessive incorrect information may lead to point deductions, even in otherwise correct answers. Provide units for all final numerical answers, if any. Showing clear work within the space provided is recommended for calculations to allow for partial credit. When provided, all final answers should be placed in the box provided for the question. Short answer questions are worth the number of points indicated on the problem. The exam totals to 150 points. A periodic table is attached as the last page of the exam. Please turn in the table with the exam if you tear it off.
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Name: ANSWER KEY 1) Which of the following is a true statement about metallic solids? a) Metallic solids are held together primarily by ionic bonds b) Metallic solids usually contain delta bonds *c) The nuclei in metallic solids are not rigidly held in place with respect to each other d) All of the above e) None of the above 2) The change in entropy of a system depends on changes in which of the following? 3) Which Law of Thermodynamics implies that real processes are always irreversible? *b) The 2 nd 4) A block of solid water (ice) with a volume of 1 L melts to form liquid water with a volume of 0.92 L. Assume that the system is isothermal, at 0 °C, and ideal. The magnitude of which term in the Boltzmann definition of entropy has increased ? *a) V b) N c) k B d) All of the above e) None of the above V is the volume each particle "sees," not the system volume
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