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Q:
Which of the following phase changes has a positive value for its entropy change?
A) boiling water
B) formation of raindrops from a cloud
C) making dry ice from gaseous CO2
D) making ice cubes from liquid water
Q:
For a particular compound, which is expected to be the largest in general?
A) the heat required to raise the temperature of one mole of the gas 10.0C
B) the heat required to raise the temperature of one mole of the liquid 10.0C
C) the molar heat of fusion at the normal melting point
D) the molar heat of vaporization at the normal boiling point
Q:
The magnitude of the heats of vaporization, fusion and sublimation of a substance reflect the
A) density of the substance.
B) magnitudes of the boiling and melting points of the substance.
C) strength of the covalent bonds between atoms in each molecule of the substance.
D) strength of the intermolecular forces of the substance.
Q:
Which is expected to have the highest surface tension at 25?
A) C5H12
B) C6H6
C) C2H5OH
D) C3H5(OH)3
Q:
Which of the following is most likely to have the highest viscosity at 25C?
A) C4H10
B) HOCH2CH2OH
C) C8H18
D) C2H5NH2
Q:
The property of a liquid that measure the liquid's resistance to flow is
A) boiling point.
B) heat of vaporization.
C) surface tension.
D) viscosity.
Q:
Which of the intermolecular forces is the most important contributor to the high surface tension shown by water?
A) dipole-dipole forces
B) dispersion forces
C) hydrogen bonding
D) ion-dipole forces
Q:
When a narrow diameter glass tube is inserted into a body of water, water rises in the tube and its surface inside is concave upwards. Which statement, concerning the strength of the intermolecular forces between glass and water molecules compared to those between water molecules, is accurate?
A) The forces of attraction between the glass and water are weaker than those in water.
B) The forces of attraction between the glass and water are stronger than those in water.
C) The forces of attraction between the glass and water are the same as those in water.
D) Intermolecular forces are irrelevant to this situation.
Q:
In the upper atmosphere, photochemical reactions involving organic molecules containing the elements ________ and ________ generate products that lead to ozone depletion.
Q:
The molecule believed to be most responsible for global warming is ________.
Q:
The burning of sulfur-containing coal can lead to acid rain due to the formation of ________ acid.
Q:
The region of the atmosphere that is closest to the earth's surface is the ________.
Q:
Gases do not behave ideally under conditions of ________ pressure and ________ temperature.
Q:
According to Graham's law, the rate of effusion of a gas is inversely proportional to the ________.
Q:
At 298 K which is larger rate of effusion or rate of diffusion?
Q:
According to the kinetic molecular theory of gases, raising the temperature of a gases increases the average kinetic energy and the frequency of ________.
Q:
According to the kinetic molecular theory of gases, what is the force of attraction of one N2 molecule for another N2 molecule?
Q:
According to the kinetic molecular theory of gases, at 298 K the average kinetic energy of O2 is ________ the average kinetic energy of CO2.
Q:
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.
Q:
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 ________.
Q:
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.
Q:
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.
Q:
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)
Q:
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)
Q:
To two significant figures, by what factor will the pressure of an ideal gas change if the temperature of the gas is changed from 100C to 200C?
Q:
If one mole of gas occupies 22.4 L at STP the same gas would occupy ________ than 22.4 L at 25C and 738 mm Hg.
Q:
When using the ideal gas law the temperature must be expressed in ________.
Q:
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.
Q:
One mole of gas at 25C has a ________ volume than one mole of gas at standard temperature.
Q:
One mole of gas at 25C in a 1.0-L flask has a ________ pressure than one mole of gas at 25C in a 5.0-L flask.
Q:
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.
Q:
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?
Q:
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 ________.
Q:
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
Q:
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
Q:
Which of the following gases has the lowest average speed at 25C?
A) C3H8
B) Kr
C) CH3NH2
D) SO2
Q:
Which of the following gases has the highest average speed at 400K?
A) N2
B) O2
C) F2
D) Cl2
Q:
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 27C 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 27C.A) 10.4%B) 20.9%C) 41.8%D) 44.8%
Q:
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 21.0C, can be made from 3.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0C.A) 0. 0975 LB) 1.30 LC) 1.33 LD) 1.36 L
Q:
A 1.000 kg sample of nitroglycerine, C3H5N3O9, explodes and releases gases with a temperature of 1985C 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 LB) 3525 LC) 4730 LD) 5378 L
Q:
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 20.0C?
A) 0. 510 atm
B) 0.681 atm
C) 1.16 atm
D) 1.66 atm
Q:
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
Q:
How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45C in the reaction shown below?XeF6(s) + 3 H2(g) -> Xe(g) + 6 HF(g)A) 9.58 gB) 11.7 gC) 35.2 gD) 106 g
Q:
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
Q:
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 LB) 27.8 LC) 55.5 LD) 60.5 L
Q:
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 LB) 5.25 LC) 7.87 LD) 8.59 L
Q:
Given three cylinders containing O2 gas at the same volume and pressure. Cylinder A is at - 20C, cylinder B is at - 15F, 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.
Q:
Which of the following would have a density of 1.37 g/L at 7.0C and 0.987 atm?
A) N2
B) O2
C) Kr
D) Rn
Q:
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
Q:
What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0-L container at 800 mm Hg?
A) -23C
B) 228C
C) 250C
D) 500C
Q:
What is the volume of 30.0 g of argon gas at 157C and 2.50 kPa pressure?
A) 3.87 L
B) 10.6 L
C) 393 L
D) 1070 L
Q:
How many grams of NOgas are there in a 5.00-L cylinder at 4.00 103 mm Hg and 23C?
A) 13.9 g
B) 32.1 g
C) 417 g
D) 2.47 104 g
Q:
A gas occupies 22.4 L at STP and 19.0 L at 100C 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
Q:
A steel bottle contains argon gas at STP. What is the final pressure if the temperature is changed to 145C?
A) 0. 653 atm
B) 0. 713 atm
C) 1. 40 atm
D) 1. 53 atm
Q:
A 4.00-L flask contains nitrogen gas at 25C 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 -55C?
A) 0.319 atm
B) 1.05 atm
C) 1.44 atm
D) 1.96 atm
Q:
A 45.0-L steel tank at 20.0C 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
Q:
A 2.75-L container filled with CO2 gas at 25C and 225 kPa pressure springs a leak. When the container is re-sealed, the pressure is 185 kPA and the temperature is 10C. How many moles of gas were lost?
A) 0.0 335 mol
B) 0. 728 mol
C) 0. 882 mol
D) 3.39 mol
Q:
How many molecules of N2 are in a 400.0 mL container at 780 mm Hg and 135C?
A) 7.01 1021 molecules
B) 7.38 1021 molecules
C) 2.12 1022 molecules
D) 2.23 1022 molecules
Q:
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.
Q:
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 -196C, 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
Q:
The volume of 350. mL of gas at 25C is decreased to 135 mL at constant pressure. What is the final temperature of the gas?
A) - 158C
B) 9.6C
C) 65C
D) 500C
Q:
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
Q:
A basketball is inflated to a pressure of 1. 90 atm in a 24.0C garage. What is the pressure of the basketball outside where the temperature is - 1.00C?
A) 1. 74 atm
B) 1. 80 atm
C) 2.00 atm
D) 2.08 atm
Q:
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
Q:
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.
Q:
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
Q:
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 amuB) Unshaded molecules have higher average speed and molecular mass = 17 amuC) Unshaded molecules have lower average speed and molecular mass = 24 amuD) Unshaded molecules have lower average speed and molecular mass = 29 amu
Q:
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
Q:
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)
Q:
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)
Q:
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
Q:
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
Q:
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
Q:
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
Q:
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
Q:
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
Q:
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)
Q:
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)
Q:
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)
Q:
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)