Chemistry McMurry 6th Edition Test Bank
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Chemistry, 6e (McMurry/Fay)
Chapter 9 Gases: Their Properties and Behavior
9.1 Multiple-Choice Questions
1) Carbon dioxide is a gas which causes environmental concern because of the greenhouse effect. What is the approximate percentage (by volume) of CO2 in the atmosphere?
A) less than 0.1%
B) about 1%
C) about 10%
D) more than 20%
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
2) Which of the following instruments directly measures the pressure of a gas?
A) spectrometer
B) manometer
C) polarimeter
D) gas chromatograph
Answer: B
Topic: Section 9.1 Gases and Gas Pressure
3) Pressure is defined as
A) force divided by unit area.
B) force times unit area.
C) mass divided by acceleration.
D) mass times acceleration.
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
4) The SI unit for pressure is the A) atmosphere.
B) MM Hg.
C) newton.
D) pascal.
Answer: D
Topic: Section 9.1 Gases and Gas Pressure
5) Which of the following is not equivalent to 1 atm pressure?
A) 10 cm Hg
B) 14.7 lb/in2
C) 101 kPa
D) 760 mm Hg
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
6) Which is the smallest quantity of pressure?
A) 1 atm
B) 1 centimeter of Hg
C) 1 mm Hg
D) 1 pascal
Answer: D
Topic: Section 9.1 Gases and Gas Pressure
7) Automobile tires are typically inflated to about 30 pounds of pressure per square inch. What is the typical air pressure of a tire in kPa?
A) 2.0 × 10-3 kPa
B) 2.0 kPa
C) 2.1 × 102 kPa
D) 2.1 × 105 kPa
Answer: C
Topic: Section 9.1 Gases and Gas Pressure
8) The pressure in the eye of a hurricane is less than atmospheric pressure. Which one of the following pressure readings could not have been taken in the eye of a hurricane?
A) 15 lbs/in2
B) 69 cm Hg
C) 690 mm Hg
D) 9.22 × 104 Pa
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
9) If mercury (density = 13.6 g/cm3) at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm3), under the same conditions the height of water will be
A) 0.180 ft
B) 2.44 ft
C) 33.2 ft
D) 399 ft
Answer: C
Topic: Section 9.1 Gases and Gas Pressure
10) Suppose you needed to closely monitor small changes in pressure inside a container using an open end manometer. For the best accuracy, the substance in the manometer should
A) be a solid.
B) be mercury.
C) have a high density.
D) have a low density.
Answer: D
Topic: Section 9.1 Gases and Gas Pressure
11) In an open end manometer, one end of a U-tube filled with mercury is attached to a gas-filled container and the other end is open to the atmosphere. If the gas pressure in the container is less than atmospheric pressure
A) Hg will be forced out of the open end of the U-tube.
B) the difference between the Hg levels in the two arms will be greater than 76 cm.
C) the Hg level will be higher in the arm connected to the container.
D) the Hg level will be higher in the arm open to the atmosphere.
Answer: C
Topic: Section 9.1 Gases and Gas Pressure
12) What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 752 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?
A) 666 mm Hg
B) 743 mm Hg
C) 761 mm Hg
D) 838 mm Hg
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
13) If the pressure in a gas container that is connected to an open-end U-tube manometer is 106 kPa and the pressure of the atmosphere at the open end of the tube is 742 mm Hg, the level of mercury in the tube will be
A) 53 mm higher in the arm open to the atmosphere.
B) 53 mm higher in the arm connected to the gas cylinder.
C) 636 mm higher in the arm open to the atmosphere.
D) 636 mm higher in the arm connected to the gas cylinder.
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
14) A container filled with gas is connected to an open-end U-tube manometer that is filled with mineral oil. The pressure in the gas container is 773 mm Hg and atmospheric pressure is 754 mm Hg. What will be the difference in the levels of mineral oil in the two arms of the manometer if the densities of Hg and mineral oil are 13.6 g/mL and 0.822 g/mL respectively?
A) 1.15 mm
B) 15.6 mm
C) 19.0 mm
D) 314 mm
Answer: D
Topic: Section 9.1 Gases and Gas Pressure
15) Which one of the following is not used to describe the condition of a gas?
A) number of moles
B) polarity
C) temperature
D) volume
Answer: B
Topic: Section 9.2 The Gas Laws
16) Which of the following equations represents "Boyle's law"?
A) P V = k
B) V T = k
C) PV = k
D) V = nk
Answer: C
Topic: Section 9.2 The Gas Laws
17) When pressure-volume measurements are made on 1.0 mol of gas at constant temperature, a plot V versus P results in a
A) hyperbola.
B) parabola.
C) sine curve.
D) straight line.
Answer: A
Topic: Section 9.2 The Gas Laws
18) When temperature-volume measurements are made on 1.0 mol of gas at 1.0 atm, a plot V versus T results in a
A) hyperbola.
B) parabola.
C) sine curve.
D) straight line.
Answer: D
Topic: Section 9.2 The Gas Laws
19) Which law does the equation, V n = k represent?
A) Avogadro's law
B) Boyle's law
C) Charles' law
D) Graham's law
Answer: A
Topic: Section 9.2 The Gas Laws
20) An approximation of absolute zero was made from an extrapolation of
A) P vs. 1/V
B) V vs. T
C) n vs. V
D) V vs. 1/T
Answer: B
Topic: Section 9.2 The Gas Laws
21) "Equal volumes of different gases at the same temperature and pressure contain the same molar amounts" is another way of stating
A) Avogadro's law.
B) Boyle's law.
C) Charles' law.
D) Graham's law.
Answer: A
Topic: Section 9.2 The Gas Laws
22) An "empty" aerosol can at 25°C still contains gas at 1.00 atmosphere pressure. If an "empty" can is thrown into a 475°C fire, what is the final pressure in the heated can?
A) 5.26 × 10-2 atm
B) 0.398 atm
C) 2.51 atm
D) 19.0 atm
Answer: C
Topic: Section 9.2 The Gas Laws
23) A basketball is inflated to a pressure of 1.50 atm in a 20.0°C garage. What is the pressure of the basketball outside where the temperature is -5.00°C?
A) 1.37 atm
B) 1.42 atm
C) 1.58 atm
D) 1.64 atm
Answer: A
Topic: Section 9.2 The Gas Laws
24) A gas bottle contains 0.650 mol of gas at 730 mm Hg pressure. If the final pressure is 1.15 atm, how many moles of gas were added to the bottle?
A) 0.0680 mol
B) 0.128 mol
C) 0.717 mol
D) 0.778 mol
Answer: B
Topic: Section 9.2 The Gas Laws
25) The volume of 350. mL of gas at 25°C is decreased to 125 mL at constant pressure. What is the final temperature of the gas?
A) -167°C
B) 8.9°C
C) 70°C
D) 561°C
Answer: A
Topic: Section 9.2 The Gas Laws
26) A balloon filled with helium gas at 20°C occupies 2.91 L at 1.00 atm. The balloon is immersed in liquid nitrogen at -196°C, raising the pressure to 5.20 atm. What is the volume of the balloon in the liquid nitrogen?
A) 0.15 L
B) 2.1 L
C) 4.0 L
D) 58 L
Answer: A
Topic: Section 9.2 The Gas Laws
27) What is the value of the gas constant, R, in units of 3 mm Hg cm mol K ?
A) 1.080 × 10-4
B) 0.1080
C) 62.36
D) 6.236 × 104
Answer: D
Topic: Section 9.3 The Ideal Gas Law
28) If the number of moles of gas is doubled at constant temperature and volume, the pressure of the gas
A) is halved.
B) is doubled.
C) is quadrupled.
D) remains the same.
Answer: B
Topic: Section 9.3 The Ideal Gas Law
29) Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains CH4, flask B contains CO2, flask C contains N2. Which flask contains the largest number of molecules?
A) flask A
B) flask B
C) flask C
D) All flasks contain the same number of molecules.
Answer: D
Topic: Section 9.3 The Ideal Gas Law
30) How many molecules of N2 are in a 500.0 mL container at 780 mm Hg and 135°C?
A) 8.76 × 1021
B) 9.23 × 1021
C) 2.65 × 1022
D) 2.79 × 1022
Answer: B
Topic: Section 9.3 The Ideal Gas Law
31) A 1.75 L container filled with CO2 gas at 25°C and 225 kPa pressure springs a leak. When the container is re-sealed, the pressure is 185 kPA and the temperature is 10°C. How many moles of gas were lost?
A) 0.0213 mol
B) 0.463 mol
C) 0.561 mol
D) 2.16 mol
Answer: A
Topic: Section 9.3 The Ideal Gas Law
32) A 75.0 L steel tank at 20.0°C contains acetylene gas, C2H2, at a pressure of 1.39 atm. Assuming ideal behavior, how many grams of acetylene are in the tank?
A) 4.33 g
B) 6.01 g
C) 113 g
D) 1650 g
Answer: C
Topic: Section 9.3 The Ideal Gas Law
33) A 1.00 L flask contains nitrogen gas at 25°C and 1.00 atm pressure. What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?
A) 1.28 atm
B) 2.01 atm
C) 2.56 atm
D) 3.29 atm
Answer: B
Topic: Section 9.3 The Ideal Gas Law
34) A steel bottle contains argon gas at STP. What is the final pressure if the temperature is changed to 115°C?
A) 0.704 atm
B) 0.768 atm
C) 1.30 atm
D) 1.42 atm
Answer: D
Topic: Section 9.3 The Ideal Gas Law
35) A gas occupies 22.4 L at STP and 14.5 L at 100°C and 2.00 atm pressure. How many moles of gas did the system gain or lose?
A) 0.06 moles gained
B) 0.03 moles gained
C) 0.03 moles lost
D) 0.05 moles lost
Answer: D
Topic: Section 9.3 The Ideal Gas Law
36) How many grams of O2 gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?
A) 17.3 g
B) 34.7 g
C) 446 g
D) 2.63 × 104 g
Answer: B
Topic: Section 9.3 The Ideal Gas Law
37) What is the volume of 10.0 g of argon gas at 157°C and 2.50 kPa pressure?
A) 1.29 L
B) 3.53 L
C) 131 L
D) 358 L
Answer: D
Topic: Section 9.3 The Ideal Gas Law
38) What is the Celsius temperature of 100.0 g of chlorine gas in a 40.0-L container at 800 mm Hg?
A) -91°C
B) 91°C
C) 182°C
D) 364°C
Answer: B
Topic: Section 9.3 The Ideal Gas Law
39) Cyanogen is a gas which contains 46.2% C and 53.8% N by mass. At a temperature of 25°C and a pressure of 750 mm Hg, 1.50 g of cyanogen occupies 0.714 L. What is the molecular formula of cyanogen?
A) CN
B) C2N2
C) C3N4
D) C4N5
Answer: B
Topic: Section 9.3 The Ideal Gas Law
40) A 0.286-g sample of gas occupies 125 mL at 60. cm of Hg and 25°C. What is the molar mass of the gas?
A) 5.9 g/mol
B) 44 g/mol
C) 59 g/mol
D) 71 g/mol
Answer: D
Topic: Section 9.3 The Ideal Gas Law
41) What is the density of fluorine gas at STP?
A) 0.590 g/L
B) 0.848 g/L
C) 1.55 g/L
D) 1.70 g/L
Answer: D
Topic: Section 9.3 The Ideal Gas Law
42) One mole of which gas has the greatest density at STP?
A) Ar
B) N2
C) CO
D) All three gases have the same density.
Answer: A
Topic: Section 9.3 The Ideal Gas Law
43) Which of the following would have a density of 1.21 g/L at 7.0°C and 0.987 atm?
A) Ar
B) N2
C) Ne
D) O2
Answer: B
Topic: Section 9.3 The Ideal Gas Law
44) Given three cylinders containing O2 gas at the same volume and pressure. Cylinder A is at -20°C, cylinder B is at -15°F, cylinder C is at 260 K. Which cylinder contains the largest mass of oxygen?
A) cylinder A
B) cylinder B
C) cylinder C
D) All cylinders contain the same mass of O2
Answer: B
Topic: Section 9.3 The Ideal Gas Law
45) Chloroform is a volatile liquid once commonly used in the laboratory but now being phased out due to its ozone depletion potential. If the pressure of gaseous chloroform in a flask is 195 mm Hg at 25°C and its density is 1.25 g/L, what is the molar mass of chloroform?
A) 10.0 g/mol
B) 76.3 g/mol
C) 119 g/mol
D) None of these
Answer: C
Topic: Section 9.3 The Ideal Gas Law
46) The action of some commercial drain cleaners is based on the following reaction:
2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH)4(s) + 3 H2(g)
What is the volume of H2 gas formed at STP when 4.32 g of Al reacts with excess NaOH?
A) 2.39 L
B) 3.59 L
C) 5.38 L
D) 5.87 L
Answer: C
Topic: Section 9.4 Stoichiometric Relationships with Gases
47) At STP how many grams of Mg are required to produce 35 mL of H2 in the reaction shown below? Mg(s) + 2 HCl(aq) → H2(g) + MgCl2(aq)
A) 0.035 g
B) 0.038 g
C) 26 g
D) 29 g
Answer: B
Topic: Section 9.4 Stoichiometric Relationships with Gases
48) When 15.0 g of zinc metal reacts with excess HCl, how many liters of H2 gas are produced at STP?
A) 0.229 L
B) 0.458 L
C) 5.14 L
D) 10.3 L
Answer: C
Topic: Section 9.4 Stoichiometric Relationships with Gases
49) A lungful of air (500 mL) contains 4.1% CO2 by volume. How many grams of KO2(s) is needed to remove the CO2 from a lungful of air at STP according to the following reaction?
4 KO2(s) + 2 CO2(g) → 2 K2CO3(s) + 3 O2(g)
A) 0.065 g
B) 0.13 g
C) 0.26 g
D) 1.2 g
Answer: B
Topic: Section 9.4 Stoichiometric Relationships with Gases
50) How many liters of oxygen are needed to exactly react with 27.8 g of methane at STP?
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)
A) 19.5 L
B) 39.0 L
C) 77.6 L
D) 85.0 L
Answer: C
Topic: Section 9.4 Stoichiometric Relationships with Gases
51) How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 2.46 atm and 45°C in the reaction shown below?
XeF6(s) + 3 H2(g) → Xe(g) + 6 HF(g)
A) 3.65 g
B) 4.46 g
C) 13.4 g
D) 40.2 g
Answer: B
Topic: Section 9.4 Stoichiometric Relationships with Gases
52) How many liters of SO3(g) are produced at 25°C and 1.00 atm from the combustion of 1.00 kg of coal which is 1.00% S by weight? Assume all the sulfur in the coal ends up as SO3
A) 0.640 L
B) 5.08 L
C) 7.63 L
D) 11.4 L
Answer: C
Topic: Section 9.4 Stoichiometric Relationships with Gases
53) At STP how many liters of NH3 can be produced from the reaction of 6.00 mol of N2 with 6.00 mol of H2?
N2(g) + 3 H2(g) → 2 NH3(g)
A) 44.8 L
B) 89.6 L
C) 134 L
D) 269 L
Answer: B
Topic: Section 9.4 Stoichiometric Relationships with Gases
54) A 10.0-L flask containing He, 2.00 mole of Ar, and 3.00 mole of Ne has a total pressure of 24.5 atm at 25°C. How many moles of He are in the flask?
A) 5.00 mol
B) 10.0 mol
C) 114 mol
D) 119 mol
Answer: A
Topic: Section 9.5 Partial Pressure and Dalton's Law
55) A balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He, and 0.026 mol H2 at 739 mm Hg. What is the partial pressure of O2?
A) 19 mm Hg
B) 23 mm Hg
C) 130 mm Hg
D) 560 mm Hg
Answer: C
Topic: Section 9.5 Partial Pressure and Dalton's Law
56) What is the total pressure in a 10.0 L flask which contains 0.127 mol of H2(g) and 0.288 mol of N2(g) at 20.0°C?
A) 0.306 atm
B) 0.681 atm
C) 0.693 atm
D) 0.998 atm
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
57) A 1.000 kg sample of nitroglycerine, C3H5N3O9, explodes and releases gases with a temperature of 1985°C at 1.000 atm. What is the volume of gas produced?
4 C3H5N3O9(l) → 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g)
A) 816.4 L
B) 3878 L
C) 5203 L
D) 5919 L
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
58) If the Earth's ozone (O3) layer has a total volume of 1.00 × 1020 km3, a partial pressure of 1.6 × 109 atm, and an average temperature of 230 K, how many ozone molecules are in the Earth's ozone layer?
A) 2.3 × 1035 molecules
B) 5.1 × 1035 molecules
C) 2.3 × 1045 molecules
D) 5.1 × 1045 molecules
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
59) Hydrogen gas is collected over water in an inverted buret. If the atmospheric pressure is 745 mm Hg, the vapor pressure of water is 18 mm Hg, and a 15.0 cm-high column of water remains in the buret, the pressure of the hydrogen gas is
A) 763 mm.
B) 745 mm Hg.
C) 727 mm Hg.
D) less than 727 mm Hg.
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
60) In the laboratory, hydrogen gas is usually made by the following reaction:
Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq)
How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mm Hg and a temperature of 21.0°C, can be made from 1.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0°C.
A) 0.0428 L
B) 0.573 L
C) 0.585 L
D) 0.599 L
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
61) The ozone molecules in the stratosphere absorb much of the ultraviolet radiation from the sun, protecting life on Earth. At a certain altitude, the temperature of the stratosphere is 240 K and the partial pressure of ozone is 1.4 × 10-7 atm. Calculate the number of ozone molecules present in 1.00 L of atmosphere at that altitude.
A) 2.1 × 1015 molecules of O3
B) 4.3 × 1015 molecules of O3
C) 8.0 × 1031 molecules of O3
D) 1.8 × 1032 molecules of O3
Answer: B
Topic: Section 9.5 Partial Pressure and Dalton's Law
62) A 0.500 g sample containing Ag2O and inert material is heated, causing the silver oxide to decompose according to the following equation:
2 Ag2O(s) → 4 Ag(s) + O2(g)
If 13.8 mL of gas are collected over water at 27°C and 1.00 atm external pressure, what is the percentage of silver oxide in the sample? The partial pressure of water is 26.7 mm Hg at 27°C.
A) 12.5%
B) 25.1%
C) 50.1%
D) 51.9%
Answer: C
Topic: Section 9.5 Partial Pressure and Dalton's Law
63) Some assumptions from the kinetic molecular theory are listed below. Which one is most frequently cited to explain Charles' law?
A) The average kinetic energy of gas particles is proportional to the Kelvin temperature.
B) Collisions of gas particles are elastic and total kinetic energy of the gas is constant.
C) A gas consists of tiny particles moving in random straight line motion.
D) The volume of the particles is negligible compared to the volume of the gas.
Answer: A
Topic: Section 9.6 The Kinetic-Molecular Theory
64) Some assumptions from the kinetic molecular theory are listed below. Which one is most frequently cited to explain compressibility of a gas?
A) The average kinetic energy of gas particles is proportional to the Kelvin temperature.
B) Collisions of gas particles are elastic and total kinetic energy of the gas is constant.
C) A gas consist of tiny particles moving in random straight line motion.
D) The volume of the particles is negligible compared to the volume of the gas.
Answer: D
Topic: Section 9.6 The Kinetic-Molecular Theory
65) Some assumptions from the kinetic molecular theory are listed below. Which one is most frequently cited to explain diffusion of a gas?
A) The average kinetic energy of gas particles is proportional to the Kelvin temperature.
B) Collisions of gas particles are elastic and total kinetic energy of the gas is constant.
C) A gas consist of tiny particles moving in random straight line motion.
D) The volume of the particles is negligible compared to the volume of the gas.
Answer: C
Topic: Section 9.6 The Kinetic-Molecular Theory
66) According to the kinetic molecular theory, the pressure of a gas in a container will decrease if the
A) number of collisions with the container wall increases.
B) number of moles of the gas increases.
C) temperature of the gas decreases.
D) volume of the container decreases.
Answer: C
Topic: Section 9.6 The Kinetic-Molecular Theory
67) What is the average speed (actually the root-mean-square speed) of a neon atom at 27°C?
A) 5.78 m/s
B) 19.3 m/s
C) 183 m/s
D) 609 m/s
Answer: D
Topic: Section 9.6 The Kinetic-Molecular Theory
68) Which of the following gases has the highest average speed at 400K?
A) CO2
B) N2O4
C) SF6
D) UF6
Answer: A
Topic: Section 9.6 The Kinetic-Molecular Theory
Copyright © 2012 Pearson Education, Inc.
69) Which of the following gases has the lowest average speed at 25°C?
A) CH4
B) H2S
C) NH3
D) O2
Answer: B
Topic: Section 9.6 The Kinetic-Molecular Theory
70) What is the temperature of CO2 gas if the average speed (actually the root-mean-square speed) of the molecules is 750 m/s?
A) 1.32 K
B) 9.92 × 102 K
C) 1.31 × 103 K
D) 9.92 × 105 K
Answer: B
Topic: Section 9.6 The Kinetic-Molecular Theory
71) At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20°C?
A) -22.0°C
B) 73.2°C
C) 381°C
D) 799°C
Answer: D
Topic: Section 9.6 The Kinetic-Molecular Theory
72) You are given two flasks of equal volume. One contains H2 at 0°C and 1 atm while the other contains CO2 at 0°C and 2 atm. Which of the following quantities will be the same for both flasks?
A) average molecular kinetic energy
B) average molecular speed
C) density
D) number of molecules present
Answer: A
Topic: Section 9.6 The Kinetic-Molecular Theory
73) Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K. Cylinder A contains Ar, cylinder B contains Cl2, and cylinder C contains N2. According to the kinetic molecular theory, which gas has the highest collision frequency?
A) Ar
B) Cl2
C) N2
D) All have identical collision frequencies
Answer: C
Topic: Section 9.6 The Kinetic-Molecular Theory
74) Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K. Cylinder A contains Ar, cylinder B contains Cl2, and cylinder C contains N2. According to the kinetic molecular theory, which gas has the highest average speed?
A) Ar
B) Cl2
C) N2
D) All have identical average speeds
Answer: C
Topic: Section 9.6 The Kinetic-Molecular
Theory
75) Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K. Cylinder A contains Ar, cylinder B contains Cl2, and cylinder C contains N2. According to the kinetic molecular theory, which gas has the highest pressure?
A) Ar
B) Cl2
C) N2
D) All have identical pressures
Answer: D
Topic: Section 9.6 The Kinetic-Molecular
Theory
76) Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K. Cylinder A contains Ar, cylinder B contains Cl2, and cylinder C contains N2. According to the kinetic molecular theory, which gas has the highest density?
A) Ar
B) Cl2
C) N2
D) All have identical densities
Answer: B
Topic: Section 9.6 The Kinetic-Molecular
Theory
77) Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K. Cylinder A contains Ar, cylinder B contains Cl2, and cylinder C contains N2. According to the kinetic molecular theory, which gas has the highest average kinetic energy?
A) Ar
B) Cl2
C) N2
D) All have identical average kinetic energies
Answer: D
Topic: Section 9.6 The Kinetic-Molecular Theory
78) The mixing of different gases by random molecular motion with frequent collisions is called
A) Avogadro's law.
B) compressibility.
C) diffusion.
D) effusion.
Answer: C
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
79) A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called
A) Boyle's law.
B) diffusion.
C) effusion.
D) sublimation.
Answer: C
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
80) Which one of the following gases will have the highest rate of effusion?
A) NO2
B) N2O
C) N2O4
D) NO3
Answer: B
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
81) Which one of the following gases will have the lowest rate of effusion?
A) SF4
B) SCl4
C) S2O5
D) SO3
Answer: B
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
82) An unknown gas effuses 1.73 times faster than krypton. What is the molar mass of the gas?
A) 28.0 g/mol
B) 48.4 g/mol
C) 110 g/mol
D) 251 g/mol
Answer: A
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
83) An unknown gas effuses 2.3 times faster than N2O4 at the same temperature. What is the identity of the unknown gas?
A) CN2
B) NH3
C) N2O
D) O3
Answer: B
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
84) If CO2 and NH3 are allowed to effuse through a porous membrane under identical conditions, the rate of effusion for NH3 will be ________ times that of CO2.
A) 0.39
B) 0.62
C) 1.6
D) 2.6
Answer: C
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
85) An unknown gas contains 83% C and 17% H by mass. If effuses at 0.87 times the rate of CO2 gas under the same conditions. What is the molecular formula of the unknown gas?
A) C2H5
B) C3H3
C) C4H10
D) C7H17
Answer: C
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
86) Which of the noble gases should show the greatest deviation from the ideal gas law at high pressures?
A) He
B) Ar
C) Rn
D) All deviate equally.
Answer: C
Topic: Section 9.8 The Behavior of Real Gases
87) Which statement about real gases is true?
A) The volume of the gas particles is zero.
B) The mass of the gas particles is zero.
C) Forces of attraction and repulsion exist between gas particles at close range.
D) The behavior of real gases can be exactly predicted using the ideal gas law.
Answer: C
Topic: Section 9.8 The Behavior of Real Gases
88) Which of the following regions of the earth's atmosphere is farthest from the surface of the earth?
A) mesosphere
B) stratosphere
C) thermosphere
D) troposphere
Answer: C
Topic: Section 9.9 The Earth's Atmosphere
89) The lowest atmospheric temperatures are found at the
A) earths surface.
B) troposphere/stratosphere junction.
C) stratosphere/mesosphere junction.
D) mesosphere/thermosphere junction.
Answer: D
Topic: Section 9.9 The Earth's Atmosphere
90) Which of the following regions of the earth's atmosphere is closest to the surface of the earth?
A) mesosphere
B) stratosphere
C) thermosphere
D) troposphere
Answer: D
Topic: Section 9.9 The Earth's Atmosphere
91) Which of the following regions of the earth's atmosphere contains the ozone layer?
A) mesosphere
B) stratosphere
C) thermosphere
D) troposphere
Answer: B
Topic: Section 9.9 The Earth's Atmosphere
92) One reaction that contributes to photochemical smog is shown below. Which of the species involved contains one or more unpaired electrons?
NO2(g) + hυ →NO(g) + O(g)
A) only NO2(g)
B) only NO2(g) and NO(g)
C) only O(g)
D) All of the these contain unpaired electrons.
Answer: D
Topic: Section 9.9 The Earth's Atmosphere
93) Which of the following is the principal cause of global warming?
A) acid rain
B) air pollution
C) greenhouse effect
D) ozone depletion
Answer: C
Topic: Section 9.9 The Earth's Atmosphere
94) Which of the following substances has increased markedly due to the use of fossil fuels and contributes to the greenhouse effect?
A) CO2
B) SO2
C) NO2
D) O3
Answer: A
Topic: Section 9.9 The Earth's Atmosphere
95) The principal cause of man-made ozone depletion in the stratosphere is due to A) NO2
B) CH4
C) CO2
D) Cl.
Answer: D
Topic: Section 9.9 The Earth's Atmosphere
96) The major source of Cl atoms in the stratosphere is from A) CFC's.
B) NaCl.
C) Cl2
D) HCl.
Answer: A
Topic: Section 9.9 The Earth's Atmosphere
97) An unusual correlation exists between the potency of an inhaled anesthetic and its ability to
A) dissolve in olive oil.
B) effuse through a porous membrane.
C) expand and compress.
D) react with ozone.
Answer: A
Topic: Chapter 9 Interlude - Inhaled Anesthetics
98) What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure, Patm, is 740 mm Hg and the difference in mercury levels, Δh, is 30 mm Hg?
A) 30 mm Hg
B) 710 mm Hg
C) 740 mm Hg
D) 770 mm Hg
Answer: B
Topic: Conceptual Problems
99) What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure, Patm, is 750 mm Hg and the difference in mercury levels, Δh, is 50 mm Hg?
A) 50 mm Hg
B) 700 mm Hg
C) 750 mm Hg
D) 800 mm Hg
Answer: B
Topic: Conceptual Problems
100) What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure, Patm, is 736 mm Hg and the difference in mercury levels, Δh, is 18 mm Hg?
A) 18 mm Hg
B) 718 mm Hg
C) 736 mm Hg
D) 754 mm Hg
Answer: B
Topic: Conceptual Problems
101) What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure, Patm, is 745 mm Hg and the difference in mercury levels, Δh, is 25 mm Hg?
A) 25 mm Hg
B) 720 mm Hg
C) 745 mm Hg
D) 770 mm Hg
Answer: B
Topic: Conceptual Problems
The apparatus shown is called a closed-end manometer because the arm not connected to the gas sample is closed to the atmosphere and is under vacuum.
102) What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure, Patm, is 745 mm Hg and the difference in mercury levels, Δh, is 25 mm Hg?
A) 25 mm Hg
B) 720 mm Hg
C) 745 mm Hg
D) 770 mm Hg
Answer: A
Topic: Conceptual Problems
103) What is the pressure (in mm Hg) of the gas inside the above apparatus if the outside pressure, Patm, is 750 mm Hg and the difference in mercury levels, Δh, is 25 mm Hg?
A) 25 mm Hg
B) 725 mm Hg
C) 750 mm Hg
D) 775 mm Hg
Answer: A
Topic: Conceptual Problems
104) When stopcock A of the open-end manometer shown below is opened, which drawing best represents the result?
A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Answer: C
Topic: Conceptual Problems
A glass tube has one end in a dish of mercury and the other end closed by a stopcock. The distance from the surface of the mercury to the bottom of the stopcock is 800 mm, as indicated by the meter stick shown in the drawing below. The apparatus is at 20°C, and the mercury level in the tube is the same as that in the dish.
105) Which drawing best shows the approximate level of the mercury in the tube when the temperature of the entire apparatus is lowered from +20°C to -20°C?
A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Answer: C
Topic: Conceptual Problems
106) Which drawing best shows the approximate level of the mercury in the tube when a vacuum pump is connected to the top of the tube, the stopcock opened, the tube is evacuated, the stopcock is closed, and the pump is removed?
A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Answer: D
Topic: Conceptual Problems
107) Which drawing best shows the approximate level of the mercury in the tube when a vacuum pump is connected to the top of the tube, the stopcock opened, the tube is evacuated, the stopcock is closed, and the pump is removed, and the stopcock is reopened?
A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
Answer: A
Topic: Conceptual Problems
108) Assume that you have a sample of gas in a cylinder with a moveable piston, as shown in diagram (1). The initial pressure, number of moles, and temperature of the gas are noted on the diagram. Which diagram (2)-(4) most closely represents the result of doubling the number of moles of gas while keeping the pressure and temperature constant?
A) diagram (2)
B) diagram (3)
C) diagram (4)
Answer: B
Topic: Conceptual Problems
Copyright © 2012 Pearson Education, Inc.
109) Assume that you have a sample of gas in a cylinder with a moveable piston, as shown in diagram (1). The initial pressure, number of moles, and temperature of the gas are noted on the diagram. Which diagram (2)-(4) most closely represents the result of doubling the temperature while keeping the pressure and number of moles of gas constant?
A) diagram (2)
B) diagram (3)
C) diagram (4)
Answer: B
Topic: Conceptual Problems
Assume that you have a sample of gas in a cylinder with a moveable piston, as shown in diagram (1). The initial pressure, number of moles, and temperature of the gas are noted on the diagram.
110) Which diagram (2)-(4) most closely represents the result of doubling the pressure while keeping the temperature and number of moles of gas constant?
A) diagram (2)
B) diagram (3)
C) diagram (4)
Answer: C
Topic: Conceptual Problems
111) Which diagram (2)-(4) most closely represents the result of doubling the pressure and doubling the temperature while keeping the number of moles of gas constant?
A) diagram (2)
B) diagram (3)
C) diagram (4)
Answer: A
Topic: Conceptual Problems
112) Assume that you have a sample of gas in a cylinder with a moveable piston, as shown in diagram (1). The initial pressure, number of moles, and temperature of the gas are noted on the diagram. Which diagram (2)-(4) most closely represents the result of doubling the pressure and number of moles of gas while keeping the temperature constant?
A) diagram (2)
B) diagram (3)
C) diagram (4)
Answer: A
Topic: Conceptual Problems
In the diagram below, nitrogen molecules are represented by unshaded spheres, oxygen molecules by gray spheres, and chlorine molecules by black spheres.
113) If the total pressure in the container is 900 mm Hg, what is the partial pressure of nitrogen?
A) 90 mm Hg
B) 180 mm Hg
C) 270 mm Hg
D) 450 mm Hg
Answer: B
Topic: Conceptual Problems
114) If the total pressure in the container is 900 mm Hg, what is the partial pressure of oxygen?
A) 90 mm Hg
B) 180 mm Hg
C) 270 mm Hg
D) 450 mm Hg
Answer: C
Topic: Conceptual Problems
115) If the total pressure in the container is 900 mm Hg, what is the partial pressure of chlorine?
A) 90 mm Hg
B) 180 mm Hg
C) 270 mm Hg
D) 450 mm Hg
Answer: D
Topic: Conceptual Problems
In the diagram below, helium atoms are represented by unshaded spheres, neon atoms by gray spheres, and argon atoms by black spheres.
116) If the total pressure in the container is 900 mm Hg, what is the partial pressure of helium?
A) 90 mm Hg
B) 180 mm Hg
C) 270 mm Hg
D) 450 mm Hg
Answer: B
Topic: Conceptual Problems
117) If the total pressure in the container is 900 mm Hg, what is the partial pressure of neon?
A) 90 mm Hg
B) 180 mm Hg
C) 270 mm Hg
D) 450 mm Hg
Answer: C
Topic: Conceptual Problems
118) If the total pressure in the container is 900 mm Hg, what is the partial pressure of argon?
A) 90 mm Hg
B) 180 mm Hg
C) 270 mm Hg
D) 450 mm Hg
Answer: D
Topic: Conceptual Problems
119) Assume that you have a mixture of nitrogen (molecular mass = 28 amu), represented by unshaded spheres, and chlorine (molecular mass = 71 amu), represented by shaded spheres at 300 K. Which of the drawings best represents the mixture?
A) drawing (a)
B) drawing (b)
C) drawing (c)
Answer: A
Topic: Conceptual Problems
120) Three bulbs, two of which contain different gases and one of which is empty, are connected as shown in drawing (a). Which drawing (b) - (d) best represents the system after the stopcocks are opened and the system is allowed to come to equilibrium?
A) drawing (b)
B) drawing (c)
C) drawing (d)
Answer: C
Topic: Conceptual Problems
121) Effusion of a 1:1 mixture of two gases, represented by unshaded and shaded spheres in the diagram below, through a small pinhole produces the result shown below. The shaded spheres have a molecular mass of 32 amu. Which gas molecules have the higher average speed and what is the molecular mass of the unshaded molecules?
A) Unshaded molecules have higher average speed and molecular mass = 14 amu
B) Unshaded molecules have higher average speed and molecular mass = 21 amu
C) Unshaded molecules have lower average speed and molecular mass = 48 amu
D) Unshaded molecules have lower average speed and molecular mass = 72 amu
Answer: D
Topic: Conceptual Problems
122) Effusion of a 1:1 mixture of two gases, represented by unshaded and shaded spheres in the diagram below, through a small pinhole produces the result shown below. The shaded spheres have a molecular mass of 20 amu. Which gas molecules have the higher average speed and what is the molecular mass of the unshaded molecules?
A) Unshaded molecules have higher average speed and molecular mass = 14 amu
B) Unshaded molecules have higher average speed and molecular mass = 17 amu
C) Unshaded molecules have lower average speed and molecular mass = 24 amu
D) Unshaded molecules have lower average speed and molecular mass = 29 amu
Answer: A
Topic: Conceptual Problems
Copyright © 2012 Pearson Education, Inc.
9.2 Algorithmic Questions
1) What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 742 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?
A) 656 mm Hg
B) 733 mm Hg
C) 751 mm Hg
D) 828 mm Hg
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
2) If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg, the level of mercury in the tube will
A) be 118 mm higher in the arm open to the atmosphere.
B) be 118 mm higher in the arm connected to the gas cylinder.
C) be 870 mm higher in the arm open to the atmosphere.
D) be 870 mm higher in the arm connected to the gas cylinder.
Answer: A
Topic: Section 9.1 Gases and Gas Pressure
3) A container filled with gas is connected to an open-end manometer that is filled with mineral oil. The pressure in the gas container is 753 mm Hg and atmospheric pressure is 724 mm. How high will the level rise in the manometer if the densities of Hg and mineral oil are 13.6 g/mL and 0.822 g/mL respectively?
A) 1.75 mm
B) 23.8 mm
C) 29.0 mm
D) 480 mm
Answer: D
Topic: Section 9.1 Gases and Gas Pressure
4) A basketball is inflated to a pressure of 1. 90 atm in a 24.0°C garage. What is the pressure of the basketball outside where the temperature is - 1.00°C?
A) 1. 74 atm
B) 1. 80 atm
C) 2.00 atm
D) 2.08 atm
Answer: A
Topic: Section 9.2 The Gas Laws
5) A gas bottle contains 0. 250 mol of gas at 730 mm Hg pressure. If the final pressure is 1.15 atm, how many moles of gas were added to the bottle?
A) 0.0 262 mol
B) 0. 0493 mol
C) 0. 276 mol
D) 0. 299 mol
Answer: B
Topic: Section 9.2 The Gas Laws
6) The volume of 350. mL of gas at 25°C is decreased to 135 mL at constant pressure. What is the final temperature of the gas?
A) - 158°C
B) 9.6°C
C) 65°C
D) 500°C
Answer: A
Topic: Section 9.2 The Gas Laws
7) A balloon filled with helium gas at 20 °C occupies 4.91 L at 1.00 atm. The balloon is immersed in liquid nitrogen at -196°C, raising the pressure to 5.20 atm. What is the volume of the balloon in the liquid nitrogen?
A) 0. 25 L
B) 3.6 L
C) 6.7 L
D) 97 L
Answer: A
Topic: Section 9.2 The Gas Laws
8) Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains C2H4, flask B contains O3, and flask C contains F2. Which flask contains the largest number of molecules?
A) flask A
B) flask B
C) flask C
D) All contain same number of molecules.
Answer: D
Topic: Section 9.3 The Ideal Gas Law
9) How many molecules of N2 are in a 400.0 mL container at 780 mm Hg and 135°C?
A) 7.01 × 1021 molecules
B) 7.38 × 1021 molecules
C) 2.12 × 1022 molecules
D) 2.23 × 1022 molecules
Answer: B
Topic: Section 9.3 The Ideal Gas Law
10) A 2.75-L container filled with CO2 gas at 25°C and 225 kPa pressure springs a leak. When the container is re-sealed, the pressure is 185 kPA and the temperature is 10°C. How many moles of gas were lost?
A) 0.0 335 mol
B) 0. 728 mol
C) 0. 882 mol
D) 3.39 mol
Answer: A
Topic: Section 9.3 The Ideal Gas Law
11) A 45.0-L steel tank at 20.0°C contains acetylene gas, C2H2, at a pressure of 1.39 atm. Assuming ideal behavior, how many grams of acetylene are in the tank?
A) 2.60 g
B) 10.0 g
C) 67.8 g
D) 990 g
Answer: C
Topic: Section 9.3 The Ideal Gas Law
12) A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure. What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?
A) 0.319 atm
B) 1.05 atm
C) 1.44 atm
D) 1.96 atm
Answer: B
Topic: Section 9.3 The Ideal Gas Law
13) A steel bottle contains argon gas at STP. What is the final pressure if the temperature is changed to 145°C?
A) 0. 653 atm
B) 0. 713 atm
C) 1. 40 atm
D) 1. 53 atm
Answer: D
Topic: Section 9.3 The Ideal Gas Law
14) A gas occupies 22.4 L at STP and 19.0 L at 100°C and 1.50 atm pressure. How many moles of gas did the system gain or lose?
A) 0.08 moles gained
B) 0.01 moles gained
C) 0.01 moles lost
D) 0.0 7 moles lost
Answer: D
Topic: Section 9.3 The Ideal Gas Law
15) How many grams of NO gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?
A) 13.9 g
B) 32.1 g
C) 417 g
D) 2.47 × 104 g
Answer: B
Topic: Section 9.3 The Ideal Gas Law
16) What is the volume of 30.0 g of argon gas at 157°C and 2.50 kPa pressure?
A) 3.87 L
B) 10.6 L
C) 393 L
D) 1070 L
Answer: D
Topic: Section 9.3 The Ideal Gas Law
17) What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0-L container at 800 mm Hg?
A) -23°C
B) 228°C
C) 250°C
D) 500°C
Answer: B
Topic: Section 9.3 The Ideal Gas Law
18) A 0. 286-g sample of gas occupies 125 mL at 60. cm of Hg and 25°C. What is the molar mass of the gas?
A) 5.9 g/mol
B) 44 g/mol
C) 59 g/mol
D) 71 g/mol
Answer: D
Topic: Section 9.3 The Ideal Gas Law
19) What is the density of hydrogen gas at STP?
A) 11.1 g/L
B) 0.0450 g/L
C) 0.0823 g/L
D) 0.0899 g/L
Answer: D
Topic: Section 9.3 The Ideal Gas Law
20) Which of the following would have a density of 1.37 g/L at 7.0°C and 0.987 atm?
A) N2
B) O2
C) Kr
D) Rn
Answer: B
Topic: Section 9.3 The Ideal Gas Law
21) Given three cylinders containing O2 gas at the same volume and pressure. Cylinder A is at - 20°C, cylinder B is at - 15°F, cylinder C is at 260 K. Which cylinder contains the largest mass of oxygen?
A) cylinder A
B) cylinder B
C) cylinder C
D) All cylinders contain the same mass of O2.
Answer: A
Topic: Section 9.3 The Ideal Gas Law
22) The action of some commercial drain cleaners is based on the following reaction:
2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH)4(s) + 3 H2(g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?
A) 3.50 L
B) 5.25 L
C) 7.87 L
D) 8.59 L
Answer: C
Topic: Section 9.4 Stoichiometric Relationships with Gases
23) How many liters of oxygen are needed to exactly react with 19.8 g of methane at STP?
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)
A) 13.9 L
B) 27.8 L
C) 55.5 L
D) 60.5 L
Answer: C
Topic: Section 9.4 Stoichiometric Relationships with Gases
24) When 14.0 g of zinc metal reacts with excess HCl, how many liters of H2 gas are produced at STP?
A) 0.2 08 L
B) 0. 416 L
C) 4.80 L
D) 9.60 L
Answer: C
Topic: Section 9.4 Stoichiometric Relationships with Gases
25) How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below?
XeF6(s) + 3 H2(g) → Xe(g) + 6 HF(g)
A) 9.58 g
B) 11.7 g
C) 35.2 g
D) 106 g
Answer: B
Topic: Section 9.4 Stoichiometric Relationships with Gases
26) A balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026 mol H2 at 749 mm Hg. What is the partial pressure of O2?
A) 20 mm Hg
B) 23 mm Hg
C) 140 mm Hg
D) 570 mm Hg
Answer: C
Topic: Section 9.5 Partial Pressure and Dalton's Law
27) What is the total pressure in a 6.00-L flask which contains 0.127 mol of H2(g) and 0.288 mol of N2(g) at 20.0°C?
A) 0. 510 atm
B) 0.681 atm
C) 1.16 atm
D) 1.66 atm
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
28) A 1.000 kg sample of nitroglycerine, C3H5N3O9, explodes and releases gases with a temperature of 1985°C at 1. 100 atm. What is the volume of gas produced?
4 C3H5N3O9(s) → 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g)
A) 742.2 L
B) 3525 L
C) 4730 L
D) 5378 L
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
29) In the laboratory, hydrogen gas is usually made by the following reaction: Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq)
How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mm Hg and a temperature of 21.0°C, can be made from 3.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0°C.
A) 0. 0975 L
B) 1.30 L
C) 1.33 L
D) 1.36 L
Answer: D
Topic: Section 9.5 Partial Pressure and Dalton's Law
30) A 0. 600 g sample containing Ag2O and inert material is heated, causing the silver oxide to decompose according to the following equation:
2 Ag2O(s) → 4 Ag(s) + O2(g)
If 13.8 mL of gas are collected over water at 27°C and 1.00 atm external pressure, what is the percentage of silver oxide in the sample? The partial pressure of water is 26.7 mm Hg at 27°C.
A) 10.4%
B) 20.9%
C) 41.8%
D) 44.8%
Answer: C
Topic: Section 9.5 Partial Pressure and Dalton's Law
31) What is the average speed (actually the root-mean-square speed) of a neon atom at 27°C?
A) 5.78 m/s
B) 19.3 m/s
C) 183 m/s
D) 609 m/s
Answer: D
Topic: Section 9.6 The Kinetic-Molecular Theory
32) Which of the following gases has the highest average speed at 400K?
A) N2
B) O2
C) F2
D) Cl2
Answer: A
Topic: Section 9.6 The Kinetic-Molecular Theory
33) Which of the following gases has the lowest average speed at 25°C?
A) C3H8
B) Kr
C) CH3NH2
D) SO2
Answer: B
Topic: Section 9.6 The Kinetic-Molecular Theory
34) What is the temperature of NO2 gas if the average speed (actually the root-mean-square speed) of the molecules is 750 m/s?
A) 1.38 K
B) 1.04 × 103 K
C) 1.38 × 103 K
D) 1.04 × 106 K
Answer: B
Topic: Section 9.6 The Kinetic-Molecular Theory
35) If NO and NH3 are allowed to effuse through a porous membrane under identical conditions, the rate of effusion for NH3 will be ________ times that of NO .
A) 0.57
B) 0.75
C) 1.3
D) 1.8
Answer: C
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
9.3 Short Answer Questions
1) Under the same pressure and temperature conditions, the level of water inside a barometer will be ________ than the level of mercury inside the barometer by a factor equal to the ratio of the density of ________ over the density of ________.
Answer: higher, mercury, water
Topic: Section 9.1 Gases and Gas Pressure
2) At an atmospheric pressure of 745 mm Hg, what is the pressure of He gas inside a cylinder that is attached to an open-end manometer in which the level of mercury in the open side of the manometer is 25 mm Hg higher than the side that is attached to the gas cylinder?
Answer: 770 mm Hg
Topic: Section 9.1 Gases and Gas Pressure
3) The pressure in a container of gas connected to an open-end mercury manometer in which the mercury level is 22 cm lower in the side open to the atmosphere and the atmospheric pressure is 734 mm Hg is ________ mm Hg.
Answer: 514
Topic: Section 9.1 Gases and Gas Pressure
4) One mole of gas at 25°C in a 1.0-L flask has a ________ pressure than one mole of gas at 25°C in a 5.0-L flask.
Answer: higher
Topic: Section 9.2 The Gas Laws
5) One mole of gas at 25°C has a ________ volume than one mole of gas at standard temperature.
Answer: larger
Topic: Section 9.2 The Gas Laws
6) At STP if 1.00 mole of gas occupies 22.4 L then 0.200 mole of gas would occupy ________ L under the same conditions.
Answer: 4.48
Topic: Section 9.2 The Gas Laws
7) When using the ideal gas law the temperature must be expressed in ________.
Answer: Kelvins
Topic: Section 9.3 The Ideal Gas Law
8) If one mole of gas occupies 22.4 L at STP the same gas would occupy ________ than 22.4 L at 25°C and 738 mm Hg.
Answer: more
Topic: Section 9.3 The Ideal Gas Law
9) To two significant figures, by what factor will the pressure of an ideal gas change if the temperature of the gas is changed from 100°C to 200°C?
Answer: 1.3
Topic: Section 9.3 The Ideal Gas Law
10) If 0.40 mol of NaN3 reacts completely in the reaction shown below, then ________ L of N2 will be produced at STP.
2 NaN3(s) → 2 Na(s) + 3 N2(g)
Answer: 13
Topic: Section 9.4 Stoichiometric Relationships with Gases
11) If 1.0 mol of N2 and 3.0 mol of H2 in a closed container initially at STP react completely in the reaction shown below, then the final pressure in the flask will be ________ atm at 273 K.
N2(g) + 3 H2(g) → 2 NH3(g)
Answer: 0.50
Topic: Section 9.4 Stoichiometric Relationships with Gases
12) At STP the number of liters of O2 required to react with 11.2 liters of CH4 to form only CO2 and H2O is ________ liters.
Answer: 22.4
Topic: Section 9.4 Stoichiometric Relationships with Gases
13) In a flask containing 2.00 mol of He, 3.00 mol of Ne, and 5.00 mol of Ar at STP the partial pressure of He is ________ mm Hg.
Answer: 152
Topic: Section 9.5 Partial Pressure and Dalton's Law
14) If 1.0 gram each of Cl2, CO2, N2, and O2 are contained in a 5-L flask, the gas with the highest partial pressure is ________.
Answer: N2
Topic: Section 9.5 Partial Pressure and Dalton's Law
15) According to the kinetic molecular theory of gases, the volume of the gas particles (atoms or molecules) is ________ compared to the volume of the container in which the gas particles are held.
Answer: negligible
Topic: Section 9.6 The Kinetic-Molecular Theory
16) According to the kinetic molecular theory of gases, at 298 K the average kinetic energy of O2 is ________ the average kinetic energy of CO2.
Answer: the same as
Topic: Section 9.6 The Kinetic-Molecular Theory
17) According to the kinetic molecular theory of gases, what is the force of attraction of one N2 molecule for another N2 molecule?
Answer: There are no attractive forces between the N2 molecules.
Topic: Section 9.6 The Kinetic-Molecular Theory
18) According to the kinetic molecular theory of gases, raising the temperature of a gases increases the average kinetic energy and the frequency of ________.
Answer: collisions
Topic: Section 9.6 The Kinetic-Molecular Theory
19) At 298 K which is larger rate of effusion or rate of diffusion?
Answer: rate of effusion
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
20) According to Graham’s law, the rate of effusion of a gas is inversely proportional to the ________.
Answer: square root of the mass of the gas
Topic: Section 9.7 Graham's Law: Diffusion and Effusion of Gases
21) Gases do not behave ideally under conditions of ________ pressure and ________ temperature.
Answer: high, low
Topic: Section 9.8 The Behavior of Real Gases
22) The region of the atmosphere that is closest to the earth’s surface is the ________.
Answer: troposphere
Topic: Section 9.9 The Earth's Atmosphere
23) The burning of sulfur-containing coal can lead to acid rain due to the formation of ________ acid.
Answer: sulfuric
Topic: Section 9.9 The Earth's Atmosphere
24) The molecule believed to be most responsible for global warming is ________.
Answer: carbon dioxide, CO2
Topic: Section 9.9 The Earth's Atmosphere
25) In the upper atmosphere, photochemical reactions involving organic molecules containing the elements ________ and ________ generate products that lead to ozone depletion.
Answer: chlorine and fluorine
Topic: Section 9.9 The Earth's Atmosphere