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Chemistry
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:
A compound is 7.74% hydrogen and 92.26% carbon by mass. At 100C a 0.6883 g sample of the gas occupies 250 mL when the presssure is 820 torr. What is the molecular formula for this compound?
A) B) C) D)
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 NO gas 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) 0.07 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) 0.0335 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 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) 0.0262 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:
In the diagram below, helium atoms are represented by unshaded spheres, neon atoms by gray spheres, and argon atoms by black spheres.If the total pressure in the container is 900 mm Hg, what is the partial pressure of helium?A) 90 mm HgB) 180 mm HgC) 270 mm HgD) 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 HgB) 180 mm HgC) 270 mm HgD) 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 HgB) 180 mm HgC) 270 mm HgD) 450 mm Hg
Q:
In the diagram below, nitrogen molecules are represented by unshaded spheres, oxygen molecules by gray spheres, and chlorine molecules by black spheres.the total pressure in the container is 900 mm Hg, what is the partial pressure of nitrogen?A) 90 mm HgB) 180 mm HgC) 270 mm HgD) 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:
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 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)
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 number of moles of gas while keeping the pressure and temperature constant? A) diagram (2)
B) diagram (3)
C) diagram (4)
Q:
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)
Q:
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)
Q:
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 20C, and the mercury level in the tube is the same as that in the dish.Which drawing best shows the approximate level of the mercury in the tube when the temperature of the entire apparatus is lowered from +20C to -20C?A) drawing (1)B) drawing (2)C) drawing (3)D) drawing (4)
Q:
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)
Q:
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, h, is 25 mm Hg?A) 25 mm HgB) 725 mm HgC) 750 mm HgD) 775 mm Hg
Q:
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.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, h, is 25 mm Hg?A) 25 mm HgB) 720 mm HgC) 745 mm HgD) 770 mm Hg
Q:
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, h, is 25 mm Hg?A) 25 mm HgB) 720 mm HgC) 745 mm HgD) 770 mm Hg
Q:
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, h, is 18 mm Hg?A) 18 mm HgB) 718 mm HgC) 736 mm HgD) 754 mm Hg
Q:
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, h, is 50 mm Hg?A) 50 mm HgB) 700 mm HgC) 750 mm HgD) 800 mm Hg
Q:
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, h, is 30 mm Hg?A) 30 mm HgB) 710 mm HgC) 740 mm HgD) 770 mm Hg
Q:
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.
Q:
The major source of Cl atoms in the stratosphere is from
A) CFC's.
B) NaCl.
C) Cl2.
D) HCl.
Q:
The principal cause of man-made ozone depletion in the stratosphere is due to
A) NO2.
B) CH4.
C) CO2.
D) Cl.
Q:
One reaction that contributes to photochemical smog is shown below. Which of the species involved contains one or more unpaired electrons?NO2(g) + h… -> NO(g) + O(g)A) only NO2(g)B) only NO2(g) and NO(g)C) only O(g)D) All of the above contain unpaired electrons.
Q:
Which of the following regions of the earth's atmosphere contains the ozone layer?
A) mesosphere
B) stratosphere
C) thermosphere
D) troposphere
Q:
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
Q:
The lowest atmospheric temperatures are found at the
A) earth's surface.
B) troposphere/stratosphere junction.
C) stratosphere/mesosphere junction.
D) mesosphere/thermosphere junction.
Q:
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
Q:
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.
Q:
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.
Q:
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
Q:
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
Q:
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
Q:
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
Q:
Which one of the following gases will have the lowest rate of effusion?
A) SF4
B) SCl4
C) S2O5
D) SO3
Q:
Which one of the following gases will have the highest rate of effusion?
A) NO2
B) N2O
C) N2O4
D) NO3
Q:
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.
Q:
The mixing of different gases by random molecular motion with frequent collisions is called
A) Avogadro's law.
B) compressibility.
C) diffusion.
D) effusion.
Q:
You are given two flasks of equal volume. One contains H2 at 0C and 1 atm while the other contains CO2 at 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
Q:
At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20C?
A) -22.0C
B) 73.2C
C) 381C
D) 799C
Q:
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
Q:
Which of the following gases has the lowest average speed at 25C?
A) CH4
B) H2S
C) NH3
D) O2
Q:
Which of the following gases has the highest average speed at 400K?
A) CO2
B) N2O4
C) SF6
D) UF6
Q:
What is the average speed (actually the root-mean-square speed) of a neon atom at 27C?
A) 5.78 m/s
B) 19.3 m/s
C) 183 m/s
D) 609 m/s
Q:
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.
Q:
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.
Q:
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.
Q:
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.
Q:
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 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) 12.5%B) 25.1%C) 50.1%D) 51.9%
Q:
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 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
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 1.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0C.A) 0.0428 LB) 0.573 LC) 0.585 LD) 0.599 L
Q:
Oxygen gas is collected over water in an inverted buret. The atmospheric pressure is 755 mm Hg, the vapor pressure of water is 26 mm Hg, and a 20.0 cm-high column of water remains in the buret. If the denstity of water is 1.00 g/mL and the density of Hg is 13.6 g/mL, then the pressure of the oxygen gas is
A) 781mm Hg.
B) 755 mm Hg.
C) 729 mm Hg.
D) 714 mm Hg.
Q:
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.
Q:
If the Earth's ozone (O3) layer has a total volume of 1.00 1020 km3, a partial pressure of 1.6 10-9 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
Q:
A 1.000 kg sample of nitroglycerine, C3H5N3O9, explodes and releases gases with a temperature of 1985C 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 LB) 3878 LC) 5203 LD) 5919 L