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1 CHEMISTRY 110 EXAM 3 April 2, 2012 FORM A 1. Which plot depicts the correct relationship between the volume and number of moles of an ideal gas at constant pressure and temperature? 2. The height of the column of mercury in the open ended manometer shown is found to be 65 mm. If the external pressure is 1.06 atm, what is the gas pressure inside the bulb? 3. Which of the following are weak electrolytes? i. HCl ii. iii. NH 3 iv. CH 3 COOH KOH A. i and iv B. all 4 C. ii and iv D. ii and iii E. i, ii and iv 4. The density of an unknown gas is measured to be 1.63 g/l at 1 atm and 27 C. What is the correct molecular formula for the gas? A. CH 4 B. O 2 C. Ar D. CO 2 A atm B atm C atm D atm E. pressure can t be determined E. Cl 2 2 3

2 Use this phase diagram to answer the next question. 6. What is the boiling point of ethyl alcohol at 400 torr? G C 1 B D Pressure (atm) A E F Temperature For a substance going from point F (initial state) to point G (final state), what changes in phase occur? Initial State Phase changes Final State A. Gas Gas! liquid Liquid! solid solid B. Solid Solid! liquid Liquid! gas gas C. Liquid Liquid! gas gas D Gas Gas! solid solid E solid Solid! liquid liquid A C B. 45 C C. 64 C D C E. There is no way to tell from this plot. 4 5

3 7. A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ar is 2.75 atm, how many moles of Ne are in the mixture? A. 5 B C D. 11 E A sample of N 2 gas at 10.0 C has a pressure of 543 torr. At what temperature will it have a pressure of 450 torr if the volume remains constant? A C B C C C D. "38.5 C E. "77.0 C 8. Identify the ideal gas among the three that are indicated in the graph below. A. I is ideal B. II is ideal C. III is ideal D. all of them are ideal E. none of them is ideal 10. Which one of the following statements regarding the kineticmolecular theory of ideal gases is false? A. Gas molecules collide elastically. B. Gases molecules are in random motion. C. The average kinetic energy is constant if T is constant. D. The kinetic energy of all the molecules is the same. E. Attractive and repulsive forces between molecules can be neglected. 6 7

4 - 11. The maximum wavelength of a photon that can cleave the C#O bond in is 112 nm. What is the strength of the C#O bond? A. 107 kj/mol B. 471 kj/mol C. 522 kj/mol D. 943 kj/mol E kj/mol Substance A has stronger intermolecular forces than substance B. Both are liquids at room temperature. Which of the statements are true for these liquids under the same conditions of temperature and pressure? 1. The surface tension of A will be greater than the surface tension of B. 2. The vapor pressure of A will be greater than the vapor pressure of B. 3. The viscosity of A will be greater than the viscosity of B. A. 1 only B. 2 only C. 3 only D. 1 and 3 only E. 1, 2, and Which one of these substances will have the largest heat of vaporization? A. I 2 B. Br 2 C. Cl 2 D. N 2 E. O Which one of the following will be the most volatile liquid? A B C D E 15. The solubility of O 2 in water at 25 C at 1.0 atm pressure of O 2 is g/l. What is the solubility of O 2 in water at 3.0 atm at the same temperature? A g/l B g/l C g/l D g/l E. 3.0 g/l O OH H 2 N O OH 8 9

5 Temperature ( C) A B C Heat (J) 16. The heating curve above was generated by measuring the heat flow and temperature of a pure substance that was initially a solid. Which one of the following corresponds to the heat capacity of the liquid of the substance? A. the slope of AB B. the length of BC C. the slope of CD D. the length of DE E. the slope of EF D E F 17. Which one of the following is soluble in hexane? (C 6 H 14 ) A. H 2 O (!) B. CH 3 COOH (aq) C. CuSO 4 (s) D. NaCl (s) E. I 2 (s) 18. A 245 ml stock solution contains 2.30 M Ca(CN) 2. When 105 ml of the stock solution is diluted to 130 ml, how many moles of CN ions will be contained in the dilute solution? A moles B moles C moles D moles E moles 10 11

6 19. A student gathers the following data by collecting N 2 gas by water displacement. Volume of gas collected: Temperature of room air and water: Barometric pressure: Vapor pressure of water at 22.5 o C: 73.2 ml o C 752 mm Hg mm Hg. Assuming ideal gas behavior, what is the number of moles of N 2 the student collected? A moles B $ 10 3 moles C moles D. 2.90$ 10 3 moles E moles 20. A sulfuric acid solution contains 571.6g of H 2 SO 4 per liter of solution and has a density of 1.329g/ml. What is the molality of H 2 SO 4 in this solution? A m B m C m D m E m 21. Which of these statements are true? i. NH 3 is more soluble in water than PH 3. ii. NaCN is more soluble in water than CH 3 CH 3. iii. Acetic acid is more soluble in water than diethyl ether (shown below). CH 3 A. Only i is true. B. Only ii is true. C. Only iii is true. D. i and ii are true. E. All three are true. 22. Which one of the following aqueous solutions has a boiling point of C? (K b for water is 0.51 C/m) A. 0.35m AlCl 3 (aq) B. 0.47m NaBr(aq) C. 0.20m K 2 SO 4 (aq) D. 1.41m Na 2 CO 3 (aq) E. none of these O C acetic acid OH CH 3 CH2 O diethyl ether CH 2 CH

7 23. An aqueous solution of 10.0 g of catalase (an enzyme found in the liver that catalyzes the decomposition of peroxide) has a volume of 1.00 L at 37 C. The osmotic pressure of the solution is 2.81 torr. What is the molar mass of catalase? A $ 10 4 g/mol B $ 10 4 g/mol C $ 10 4 g/mol D g/mol E g/mol 25. CCl 2 F 2 is considered to be environmentally safe and is used as a refrigerant. The heat of vaporization of CCl 2 F 2 is 289 J/g. What mass of this substance must evaporate in order to freeze (at 0 C) 2 moles of water initially at 20 C? The heat of fusion of water is 334 J/g and the specific heat of water is 4.18 J/g-K. A. 52.0g B. 26.0g C. 15.0g D. 3.01g E. 2.89g 24. Which of the following aqueous solutions would you expect to be the best conductor of electricity? A. 1.0 M HCl B. 1.0 M methanol (CH 3 OH) C. 1.0 M Mg(NO 3 ) 2 D. 1.0 M sugar (C 6 H 12 O 6 ) E. each of these solutions will have the same conductivity 26. Which of the following phase changes are endothermic processes? 1. condensation 2. melting 3. evaporation 4. sublimation A. 1 only B. 1 and 4 only C. 2 and 3 only D. 1 and 4 only E. 2, 3, and

8 27. The plot shows the distribution of speeds of different gases at the same temperature. If each of these gases was in a 1 L box at STP, which one would have the greatest density? A. A B. B C. C Fraction of molecules A D. They would all have the same density. B Molecular speed E. It is impossible to tell from this information. C 28. Glycerin is a nonvolatile liquid that dissolves completely in ethanol CH 3 CH 2 OH. What is the vapor pressure of pure ethanol at 20 C if the vapor pressure of a solution containing 46.0 g of glycerin mixed with g of ethanol is 38.6 torr at 20 C? A torr B torr C torr D. 135 torr E. 270 torr END OF TEST 16 17

9 CHEMISTRY 110 EXAM 3 April 2, 2012 Answer Key FORM A 1. A 2. B 3. D 4. C 5. A 6. C 7. A 8. A 9. D 10. D 11. E 12. D 13. A 14. A 15. D 16. C 17. E 18. B 19. D 20. D 21. E 22. A 23. A 24. C 25. A 26. E 27. A 28. C 18

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