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practice_exam_3_sns - 331{part 1 of 1 13 points The...

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Unformatted text preview: 331 {part 1 of 1} 13 points The pressure at 23,333 feet above sea level is about 433 u1mHg. ‘Ib what does this corn.L spend? 1. 53.3 kPa 2. 523 Pa 3. 3. 523 kPa 4. 3. 523 Torr 5. 52.2 g-m_1-s_2 332 {part 1 of 1} 13 points 1'31 3.5 L sample of nitrogen at 25°C and 3.73 atm is allowed to expand to 13.3 L. The tem— perature remains constant. What is the final pressure? 1. 3.333 atm 2. 3.3 atm 3. 3.12 atm 4. 3.?5 atm 5. 3.38 atm 333 {part 1 of 1} 13 points A certain quantity of a gas occupies 31.3 mL at 33°C. It the pressure remains oonstant, what would he the volume of the gas at 123°C? 1. 32 n1L 2. 52 mL 3. 32 mL 4. T2n1L 334 {part 1 of 1) 13 points A sample of N2 gas occupies a volume of 743 mL at STP. What volume would N2 gas occupy at 155 DC at a pressure of 333 ten? 1. 2415 mL 2. 3235 mL 3. 312 mL 4. 533 mL 5. 533 mL 3. 1732 mL '1'. 323 mL 3.333mL 335 {part 1 of 1} 13 points The normal respiratory rate for a human be ing is 15.3 breaths per minute. The average volume of air for each breath is 535 cm3 at 23°C and 3.35 x 134 Pa. What is the volume of air at STP that an individual breathes in one day? Give your answers in cubic meters. 1.133m3fday 2. 535 cmafday 3. None of these 4. 525 m3 fd ay 5. 2.25 cmafday e. 3.33m3fday 333 {part 1 of 1} 13 points What is the density of hydrogen gas at STP? 1. 2.2 ng 2. {1.222 gfL 3.11.2 gfL 4. 22.4 gfL DD? {part 1 of 1} 11] points At STP, 33.4 liters of (nrygen gas{CIg_) will have a mass of 1. 28.1] g. 2. 32.1] g. 5. 22.4 g. 4. 15.5 g. Consider two balloons filled with gas and ar— ranged so that P. V. T are the same in both. The number of molecules in each balloon 1. could he difierent if the filling gases are difierent. 2. would he the same only if the filling gases are the same. 3. must he different. 4. must he the same. DDQ {part 1 of 1} 11] points What is the density of xenon gas at T51] kPa and 25°C? 1.12.5 g - L-1 2. 5.552 g - L—1 5. 72.5 g - L—1 4. 5.55 g - L—1 5. 52.7 g - L-l flll] {part 1 of 1} 11'] points How many atoms of argon occupy 1 mL if the temperature is 311110C and the pressure is 1.55 x 15—3 Torr? 1.1.55 x 1513 2. 2.5:] x 15—“ 5. 2.44 x 1519 4.1.25 x 15115 5. 5.22 x 1513 [111 {part 1 of 1} 1'1] points 1What is the number of molecules in 23.4 L of nitrogen at exactly l[I'DC and 3 atrn? 1.1.51 x 1523 2.1.51 )4 1524 5. 2.51 x 1523 4. 5.52 x 152‘1 5.15.5 x 15-9-5 I313 {part 1 of 1) 11'] points Jane works for the Dr. Pepper Company. She is told that she must add 4.51} liters of CD; to each Tvat of Dr. Pepper at STP. How many grains of CD; does this represent? 1. 5.54 g 2. 4.445 g 5.1155455 g 4. 2.25 g 5.5.251 g {113 {part 1 of 1) 1'1] points Consider the reaction 4K02f5) + 2 CDQfg) —5 EKQCDEIES) —I— 302(g) . How much K02 is needed to react with ?5.'D L of carbon dioxide at STP? 1. 13.4 mol 2. 331] mol 3. 1.13? mol 4. {1.338 mol 5. 3.35 mol 214 {part 1 of 1} I] points Lithium metal reacts with nitrogen gas to produce lithium nitride. 1What volume of nitrogen gas at 2 atm and 175°C is required to produce 75.2 g of lithium nitride? 1. 32.5 L 2. 112 L 3. 32.2 L 4. 15.5 L 5. 72.2 L 215 {part 1 of 1} 12 points A sample of dangerously reactive fluorine gas is contained in a. stainless steel container which has a 35 L capacity at a pressure of 152 pounds per square inch and a temper— ature of 232°C. What mass of fluorine gas sample is in the stainless steel container? 1. 25.5555 g 5. 51.5452 g 5. 7.55555 g 4. 11.5451 g 5. 555.555 g 215 {part 1 of 1) 12 points A. flask contains l[l.123 moles of an ideal gas that occupies 731 n1L. 1'31. second flask at the same temperature contains 2.2712 moles of the same gas. The premure is the same in both flasks. What is the volume of the second flask? 1. 55,155 mL 2. 1555 mL 5. 5.5 mL 4. 452 mL 5.224mL 217 {part 1 of 1) 12 points A 75 mL metal bulb is filled with 42.1 g of CH4 and 3.23 g of NH3. What is the total preaure in the bulb at 315°C? 1.1.51 x 153 ten 2. There is no observable pressure in the bulb because the metal bulb does not allow the exterior atmosphere to exert a. force. 5. 1.55 x 1515 torr- 4. 2.32 torr 5. 7.55 x 155 torr 213 {part 1 of 1} 12 points Determine the molecular weight of a com— pound given the gas phase data: mass of 27.54 gT temperature of 134°C, premure of 255 torr, volume of 14.32 L. 1. 2.245 gj'mol 2. 35.7 gfmol 3. 272 gfmol 4. 121 gfmol 5. 24.2 gfmol Which of the following '55 ND'I' true about gases? 1. The gas is at STP if it is at 273 K and 1 atm. 2. The density of a gas can be increased by applying increased pressure. 3. Cases can expand without limit. 4. Cases exert pressure on their surround— 13158» 5. The volume a gas occupies is directly proportional to its molecular weight. 323 {part 1 of 1) 13 points A 113 g sample of impure magnesium oxide is decomposed to produce 22 L of oxygen gas at STP. Assuming that the only substance to decompose in the sample is magnesium oxide, what is the percent of the magnesium oxide in the original sample? 1. 3.31%?) 2. 3.315493: 3. 33.235723 4. 71.423393 5. 73.5714% 321 {part 1 of 1} 13 points A. mixture of oxygen and helium is 32.3% by mam oxygen. It is collected at atmospheric pressure {T45 torr]. What is the partial pressure of (ncygen in tlns mixture? 1. 333 Torr 2. 412 Torr 3. 333 Torr 4. 443 Torr 5. 233 Torr 322 {part 1 of 1} 13 points You have learned from kinetic molecular the ory that for an ideal gas there is an inverse square root relationship between gas velocity and mass. Given this information, what is the ratio of gas velocities for H: to C02? 1. 1 to 22 2. 1 to 4.33342 3. 22 to 1 4. 2 to 44 5. 4.33342 to 1 323 {part 1 of 1) 13 points Which one of the following statements is NOT cons'stent with the kinetic—molecular theory? 1. Collisions between the molecules of a gas are elastic. 2. Except near the liquificatiou point, the attractive forces between molecules of a gas are very small. 3. A given sample of a gas is mostly empty space except near the liquificatiou point. 4. The attractive forces between the molecules of a gas become significant only at very low temperatures. 5. The volume occupied by the molecules {only} of a gas becomes significant only at a very low pressure. 324 {part 1 of 1) 13 points If the average speed of a water molecule at 250C is 343 m- s_lT what is the average speed at 133°C? 1. 331 mfs 2. 323 mfs 3. 572 mfs 4. 713 mfs 5. 5123I mfs Balloon X is filled with the carbon monox— ide. Balloon Y is filled to the same volume with carbon dioxide. The balloons are left for several days in a room at constant tempera— ture. Which balloon would you expect to be smallest after this period of time? 1. Both would be the same size. 2. Balloon X. 3. Balloon Y U23 {part 1 of 1} 1!] points At 3°C and 1 atmosphere of pressure, which of the following gases would have the highest average molecular speed? 1. NH3 2. Ar 3. co.2 4. H2 5. N2 [127 {part 1 of 1} ll] points lCalculate the ratio of the rate of efl'usion of C02 to that of He. 1. 3.3911]: 1 2. 3.3!]: l 3.11:1 4.12:1 5. 3.3: 1 U28 {part 1 of 1} 13 points List the gases H42, CHEF, N2, CF4, HF in or— der of DECREASING tendency to behave as ideal gases. {Consider intermolecular forces.) 1. H2, HF, N2, CHgF, CF4 2. HF, CHEF, CF4, N2, H2 3. H2, CHBF, N2, CF4, HT 4. CF4, CHEF, N2, HF, H2 5. H2, N2, CF4, CHEF, I-[F U29 {part 1 of 1) It] points In an improved version of the gas law, V is replaced by {V — an. E3}. 1Which of the following would you predict has the largest l3? 1. Ne 2. Ar 3. Xe 4. Kr 5. He DBD {part 1 of 1] It] points In an improved version of the gas law, P 2 is replaced by (P + 11,—?) Whieh of the following would you predict has the largest a? 1. 02 2. N2 3. He 4. H20 5. Ar 6. Ne ?. NH3 8. CH4 001 (part 1 of 1} 10 points 1‘What are all of the intermolecular forces that are responsible for the existence of ice? 1. hydrogen bonding and dipole-dipole 2. dipolevdipole and London forces 3. dipole-dipole, London forces, and hydro- gen bonding 4. dipolevdipole and ion-ion 5. London forces [102 {part 1 of 1} 10 points For which of the molecules A) 03 B) (302 C) 02 D} 802 will dipole-dipole interactions be important? 1. A and B only 2. B and C only 3. A and C only 4. B and D only 5. A and D only 6. All have dipolevdipole interactions. 7. Another combination of compounds 8. None has dipole-dipole interactions. 9. C and D only 003 [part 1 of 1) 10 points 1‘Which of the following molecules A) CH3ICOOH C) CH30CH3 B} CflchgOH D) CflgCHO are likely to form hydrogen bonds? 1. A and D only 2. None forms hydrogen bonds. 3. A and B only 4. Another combination of compounds 5. B and D only 6. All are likely to form hydrogen bonds. 7. B and C only 8. A and C only 9. C and D only 004 (part 1 of 1} [1 points Calculate the ratio of potential energies for an ion-dipole interaction between Li+ and K+ and a water molecule. The ionic radius of Li+, K+, and Cl- ions are 58 pm, 136 pm, and 181 pm, respectively. 1. 5.66 2. 2 3. 1.33 4. 0.5 5. 1 005 {part 1 of 1) 10 points Which of HCl or NaCl is likely to have the higher normal boiling point? 1. They are same 2. NaCl 3. HCl 006 [part 1 of 1} [1 points Calculate the ratio of potential energies for an ion-dipole interaction between Li+ and K+ and a water molecule. The ionic radius of Li+, K+, and Cl- ions are 58 pm, 138 pm1 and 131 pm} respectively. 1. 5.66 2. 1.33 3. 2 4. 1 5. [1.5 008 {part 1 of 1) 1|] points Arrange the following molecules H20, l'lngJ Ar, NaCl in order of expected increasing boiling points: 1. Ar, NH3, H20, NaCl 2. NH3, Ar, H20, NaCl 3. NaCl, H20, NH?” Ar 4. correct answer not given A certain liquid has a meniscus that curves downward in glass. This means that the cohe- sive forces in the liquid are less than the forces between the liquid and the glass. 1.Fa.lse| 2. True 009 (part 1 of 1} 10 points "What type of intermolecular forces would you expect to find in a sample of PF3? 1. covalent 2. London 3. H-bonding 4. interionic 5. dipole-dipole 010 {part 1 of 1} 10 points Dispersion (London) forces result from 1. the formation of a loose covalent link- age between a hydrogen atom connected to a very electronegative atom in one molecule and another very electronegative atom in a neighboring molecule. 2. attraction between molecules in a liquid and molecules or atoms in a solid surface with which the liquid is in contact. 3. distortion of the electron cloud of an atom or molecule by the presence of nearby atoms or molecules. 4. attractive forces between a molecule at the surface of a liquid and those beneath it which are not balanced by corresponding forces from above. 5. the balance of attractive and repulsive forces between two polar molecules. 011 [part 1 of 1} 1|] points 1What are the strongest intermolecular forces present in a liquid sample of PF5'? 1. dispersion 2. interionic 3. dipole-dipole 4. hydrogen bonding 5. covalent 012 [part 1 of 1) 10 points 1‘What type of intermolecular forces would you expect to find in a sample of 303? 1. dipole-dipole 2. H-bonding 3. dispersion 4. interionic 5. covalent 013 [part 1 of 1} 10 points The forces of attraction between a liquid and a. surface are called 1. adhesive forces. 2. molecular forces. 3. intramolecular forces. 4. dispersion forces. 5. cohesive forces. 014 {part 1 of 1] It] points Cohesive forces are forces between molecules within a 1. liquid. 2. gas. 3. solid. 4. plasma. {115- {part 1 of 1} It] points 1Which of the following is true? 1. Viscosity increases as the strength of in— termolecular forces increase. 2. Vapor premure increases as the strength of intermolecular forces increases. 3. Vapor pressure is not aflected by temper— ature. 4. None of these statements is true. 5. Viscositv increases as temperature in— creases. fllfl {part 1 of 1) 11] points 1Which would you expect to he most viscous at a given temperature? 1. ssr2 2. can” 3. Cannot predict from the molemllar for— mula. 4. CH4 ...
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