6) Place the following substances in order of increasing vapor pressure at a given temperature.

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1 CHM2045 F12 Exam # MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Choose the substance with the lowest viscosity. A) Cl 3 CCHCl 2 B) Cl 2 CHCH 2 Cl C) Cl 3 CCCl 3 D) ClCH 2 CH 2 Cl E) Cl 2 CHCHCl 2 2) Which one of the following has a definite shape and volume? A) liquid B) gas C) solid D) none of the above E) all of the above 3) Which of the following statements is TRUE? A) Energy is given off when the attraction between two molecules is broken. B) Increasing the pressure on a solid usually causes it to become a liquid. C) The potential energy of molecules decrease as they get closer to one another. D) Intermolecular forces are generally stronger than bonding forces. E) None of the above are true. 4) What is the strongest type of intermolecular force present in CHF 3? A) dipole-dipole B) hydrogen bonding C) dispersion D) ion-dipole E) none of the above 5) A solid can be purified through what technique? A) dilution B) melting C) boiling D) dissolution E) recrystallization 6) Place the following substances in order of increasing vapor pressure at a given temperature. SF 6 SiH 4 SF 4 A) SF 6 < SiH 4 < SF 4 B) SF 4 < SF 6 < SiH 4 C) SiH 4 < SF 6 < SF 4 D) SiH 4 < SF 4 < SF 6 E) SF 6 < SF 4 < SiH 4 A-3

2 7) Vanadium crystallizes in a body centered cubic structure and has an atomic radius of 131 pm. Determine the density of vanadium, if the edge length of a bcc structure is 4r/ 3. A) 12.2 g/cm 3 B) 8.46 g/cm 3 C) 6.11 g/cm 3 D) 2.77 g/cm 3 E) 3.06 g/cm 3 8) How much energy is required to vaporize 98.6 g of ethanol (C 2 H 5 OH) at its boiling point, if its!h vap is 40.5 kj/mol? A) 11.5 kj B) 86.7 kj C) 18.9 kj D) 52.8 kj E) 39.9 kj 9) Which of the following concentration units are temperature dependent? A) mole fraction B) mass percent C) molality D) molarity E) none of the above. 10) Determine!H vap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K. A) 24 kj/mol B) 41 kj/mol C) 34 kj/mol D) 13 kj/mol E) 79 kj/mol 11) Lithium crystallizes in a body-centered cubic structure. What is the coordination number of each atom? A) 12 B) 6 C) 8 D) 4 12) Identify the type of solid for AgCl. A) nonbonding atomic solid B) networking atomic solid C) ionic solid D) molecular solid E) metallic atomic solid 13) Choose the molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force. A) H 2 B) CF 4 C) BCl 3 D) NH 3 E) SO 2 14) Place the following substances in order of decreasing vapor pressure at a given temperature. PF 5 BrF 3 CF 4 A) BrF 3 > CF 4 > PF 5 B) CF 4 > BrF 3 > PF 5 C) BrF 3 > PF 5 > CF 4 D) CF 4 > PF 5 > BrF 3 E) PF 5 > BrF 3 > CF 4 A-4

3 15) Which of the following is considered a molecular solid? A) Xe B) Cu C) NH 4 NO 3 D) I 2 E) None of these is a molecular solid. 16) Calculate the molality of a solution that is prepared by mixing 25.5 ml of CH 3 OH (d= g/ml) and 387 ml of CH 3 CH 2 CH 2 OH (d= g/ml). A) 4.98 m B) m C) 2.01 m D) m E) 1.57 m 17) Determine the Henry's law constant for ammonia in water at 25 C if an ammonia pressure of atm produces a solution with a concentration of 1.3 M. A) 59 M/atm B) M/atm C) M/atm D) 35 M/atm E) M/atm 18) Give the term for the temperature at which the gas and liquid phases form a supercritical fluid. A) critical temperature B) absolute temperature C) solid temperature D) definite temperature E) fluid temperature 19) Determine the vapor pressure of a solution at 25 C that contains 76.6 g of glucose (C 6 H 12 O 6 ) in ml of water. The vapor pressure of pure water at 25 C is 23.8 torr. A) 72.9 torr B) 70.8 torr C) 23.1 torr D) 22.9 torr E) 7.29 torr 20) Which of the following statements is generally TRUE? A) The solubility of a solid is highly dependent on temperature. B) The solubility of a solid is highly dependent on both pressure and temperature. C) The solubility of a solid is highly dependent on pressure. D) The solubility of a solid is not dependent on either temperature or pressure. E) None of the above. 21) Which of the following ions should have the most exothermic!h hydration? A) Mg 2 + B) Sr 2 + C) Na+ D) Al 3 + E) Ca ) Which of the following solutions will have the lowest freezing point? A) m K Br B) m CH3CH2OH C) m Na 2 CO3 D) m BaCl2 23) A solution is m LiF. What is the molarity of the solution if the density is 1.10 g/ml? A) M B) M C) M D) M E) M A-5

4 24) Identify the compound with the highest boiling point. A) H 2 S B) HF C) CH 4 D) H 2 O E) NH 3 25) Determine the vapor pressure (in mm Hg) of a substance at 29 C, whose normal boiling point is 76 C and has a!h vap of 38.7 kj/mol. A) 13 mm Hg B) 96 mm Hg C) 48 mm Hg D) 21 mm Hg E) 80 mm Hg A-6

5 Answer Key Testname: CHM2045 F12 EXAM #3 1) D 2) C 3) C 4) A 5) E 6) B 7) C 8) B 9) D 10) A 11) C 12) C 13) E 14) D 15) D 16) C 17) A 18) A 19) C 20) A 21) D 22) D 23) C 24) D 25) B A-7

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