1412 Final Exam Sample+Key

1412 Final Exam Sample+Key - Houston Community College...

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       Houston Community College System Departmental SAMPLE Final Examination Chemistry 1412 1
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PART I (2 points each) Multiple choice - Please DO NOT write or mark on this paper. Write your correct answer on scantron. 1. In which colligative property (ies) does the value decrease as more solute is added? A. boiling point B. freezing point C. vapor pressure D. freezing point and vapor pressure 2. What is the molarity of a solution prepared by dissolving 25.2 g CaCO 3 in 600. mL of a water solution? 3. What is the freezing point of an aqueous glucose solution that has 25.0 g of glucose, C 6 H 12 O 6 , per 100.0 g H 2 O (K f = 1.86°C /m)? 4. What is the osmotic pressure in atm produced by a 1.20 M glucose (C 6 H 12 O 6 ) solution at 25°C? 5. The vapor pressure of pure ethanol at 60°C is 349 mm Hg. Calculate vapor pressure in mm Hg at 60°C for a solution prepared by dissolving 10.0 mol of naphthalene (nonvolatile) in 90.0 mol of ethanol? A. 600 B. 314 C. 34.9 D. 69.8 6. For first-order reactions the rate constant, k, has the units 7. For second-order reactions the slope of a plot of 1/[A] versus time is 8. If the reaction 2A + 3D products is first-order in A and second- order in D, then the rate law will have the form rate = 9. In the first-order reaction A products the initial concentration of A is 1.56 M and the concentration is 0.869 M after 48.0 min. What is the value of the rate constant, k, in min -1 ? A. 3.84 x 10 -2 B. 2.92 x 10 -2 C. 5.68 x 10 -2 D. 1.22 x 10 -2 10. Consider the reaction 2HI(g) H 2 (g) + I 2 (g). What is the value of the equilibrium constant, K c , if at equilibrium, [H 2 ] = 6.50 x 10 -7 M, [I 2
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