CHEM101-2008FALL-EXAM_3-FINAL-TEXT

CHEM101-2008FALL-EXAM_3-FINAL-TEXT - Name Signature...

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Name Signature Recitation Instructor Recitation Day/Time Chemistry 101 Final Exam Saturday, December 13, 2008 Turn in all pages of your exam which consists of ten pages and a periodic table. Part I should be answered on the appropriate pages in the examination. Answers to Part II should be placed on this cover sheet. For Part I, the work must be shown - the answer alone is worth very little. Part II Answers a b c d e a b c d e 1. 13 . 2. 14 . 3. 15 . 4. 16 . 5. 17 . 6. 18 . 7. 19 . 8. 20 . 9. 21 . 10 . 22 . 11 . 23 . 12 . 24 . 25 . 26 . 27 . Part I
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1. (15 points) _____________ 2. (15 points) _____________ 3. (35 points) _____________ Part II (5 points each) _____________ TOTAL _____________
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2 Name________________________________ Part I 1. (15 points) Calculate the molar mass of an unknown gas if 0.500 grams of the gas occupies 125 ml at 25ºC and 721 mm of Hg pressure.
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3 Name__________________________________ 2. (15 points) Given the following reactions: 3 PH (g) P(g) + 3H(g) rxn ΔH = 965 kJ 2 O (g) 2O(g) rxn ΔH = 490 kJ 2 H O(g) 2H(g) + O(g) rxn ΔH = 930 kJ 2 4 10 4P(g) + 5O (g) P O (s) rxn ΔH = -6760 kJ calculate the enthalpy change for the reaction 3 2 2 4 10 4PH (g) + 8O (g) 6H O(g) + P O (s)
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4 Name_________________________________ 3. (35 points) For the following molecules, give the Lewis structures, the molecular geometry, hybridization, and whether the molecule is polar or nonpolar. Where appropriate, indicate resonance structures. A) XeF 4 B) N 2 O C) NO 3 - D) BrF 3
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5 Name__________________________________ Part II – Place Answers on Cover Page 1. The answer to the following sequence of mathematical operations will have how many significant figures? (7.314 x 52.1) + (10.9725 x 22.) – (7.532 ÷ 9.47) = (a) 1 (b) 2 (c) 3 (d) 4 (e) 5 2. Correct names for the following compounds are: CCl 4 , HI and Al(NO 3 ) 3 (a) monocarbontetrachlorine, hydrogen iodine, aluminum nitrate (b) carbon tetrachlorine, hydrogen iodide, aluminum(III) nitrate (c) carbon tetrachloride, hydroiodic acid, aluminum nitrate (d) tetrachlorocarbon, hydroiodic acid, aluminum trinitrate (e) tetrachlorocarbon, hydroiodine acid, aluminum nitrate 3. In the balanced equation for reaction of H 3 PO 4 with KOH the coefficients in the balanced chemical equation 3 4 3 4 2 aKOH + bH PO cK PO + dH O are: (a) a = 2, b = 2, c = 2, d = 3 (b) a = 1, b = 2, c = 2, d = 1 (c) a = 1, b = 1, c = 1, d = 1
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CHEM101-2008FALL-EXAM_3-FINAL-TEXT - Name Signature...

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