Final Exam - SC111: Final Exam (Fall 2007) Name: _ Alpha: _...

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SC111: Final Exam (Fall 2007) Name: ____________________________________ Alpha: _______________ United States Naval Academy Chemistry Department SC111: Foundations of Chemistry Final Exam Fall 2007 Instructions 1. DO NOT open this exam until told to do so. 2. On the top of this page , write your name, section number, and alpha number. Do not remove cover page from the rest of the exam. 3. On the scantron sheet , write your name, section number, instructor's name, and alpha number. Also, bubble in your alpha number. 4. There are 8 pages to this exam (including this cover sheet). The exam contains 100 multiple choice questions. Select the best answer and record it on the exam and on the scantron sheet. There is no penalty for guessing. 5. Periodic table, constants, and equations are on the last page of the exam. The last page may be removed from the exam. 6. Read the following statement: This exam will be given to all SC111 students over the period 7 December to 14 December. In order to ensure a fair exam and be consistent with the USNA policies concerning graded academic work, you are not allowed to discuss any aspect of this exam (format, length, content, etc.) until 15 December .
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1. Which of the following is an example of a homogeneous mixture? a. pure water b. sugar water c. the mercury in a barometer d. a beaker of sand and iron filings 2. Which of the following is an example of a chemical change? a. distillation of sea water b. melting of ice c. burning of gasoline d. dew formation 3. A piece of platinum wire has a diameter of 0.1019 inches. What is the mass of 1.000 foot of the wire? Useful Constants Density of platinum = 21.46 g/cm 3 1 inch = 2.54 cm (exactly) 1.000 pound = 453.6 g cylinder volume = π (radius) 2 (length) a. 5.334 g b. 34.42 g c. 137.7 g d. 1351 g 4. In lab, we make a series of observations. What is a possible explanation of observations called? a. law b. theory c. data d. hypothesis 5. The agreement of a measured value with the true value is called a. accuracy. b. repeatability. c. precision. d. significance. 6. How many significant figures are there in the answer to the following problem? () 88232 831 2125 0142 .. . .? ×= a. one b. two c. three d. four 7. A hypothetical element has the following isotopic composition: Mass number Mass (in amu) Percent abundance 110 109.93 37.40 111 110.92 62.60 What is the average atomic mass of the element? a. 110.42 amu b. 110.55 amu c. 110.81 amu d. Insufficient information is given. 8. What does the following symbol represent? 16 31 X 2 a. an atom of sulfur b. an atom of gallium c. a sulfur anion d. a Ga cation 9. The correct name for a saturated hydrocarbon with the molecular formula of C 2 H 6 is a. butane. b. propane. c. ethane. d. methane. 10. Given the following: 24 Mg 52 Cr 124 Sn 59 Co Which isotope has an equal number of neutrons and electrons? a. 24 Mg b. 52 Cr c. 124 Sn d. 59 Co 11. Which pair combines to form an ionic compound? a. elements E and M b. elements R and Z c. elements M and J d. elements Q and X E G J L M Q R T U W X Y Z
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12. What is the correct chemical formula for iron(III) oxide?
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Final Exam - SC111: Final Exam (Fall 2007) Name: _ Alpha: _...

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