Question 1

Arrange the following gaseous substances in order of decreasing average molecular speed at 25°C.

Accepted Answer

A)  helium > oxygen > fluorine > carbon dioxide > argon 
B)  helium > oxygen > fluorine > argon > carbon dioxide 
C)  argon > oxygen > helium > carbon dioxide > fluorine 
D)  carbon dioxide > argon > fluorine > oxygen > helium 
E)  carbon dioxide > fluorine > argon > oxygen > helium 
A)  helium > oxygen > fluorine > carbon dioxide > argon 
B)  helium > oxygen > fluorine > argon > carbon dioxide 
C)  argon > oxygen > helium > carbon dioxide > fluorine 
D)  carbon dioxide > argon > fluorine > oxygen > helium 
E)  carbon dioxide > fluorine > argon > oxygen > helium B

Question 2

Based on temperature, there are four main layers to our atmosphere. What is the correct name for the layer in which we live?

Accepted Answer

A)  troposphere 
B)  thermosphere 
C)  stratosphere 
D)  mesosphere 
E)  ionosphere 
A)  troposphere 
B)  thermosphere 
C)  stratosphere 
D)  mesosphere 
E)  ionosphere A

Question 3

Aluminum and oxygen react to form aluminum oxide. How many L of oxygen at 296 K and 1.4 atm of pressure are necessary to form 3.25 g of aluminum oxide? R = 0.0821 L atm mol-1 K-1.

Accepted Answer

A)  6.5 × 10-2 L 
B)  0.55 L 
C)  0.83 L 
D)  1.3 L 
E)  56 L 
A)  6.5 × 10-2 L 
B)  0.55 L 
C)  0.83 L 
D)  1.3 L 
E)  56 L C

Question 4

If, at constant temperature, the volume of a flask equipped with a moveable piston is reduced to 1/4 its original volume, what must happen to the pressure?

Accepted Answer

A)  It is increased by a factor of four. 
B)  It is increased by a factor of eight. 
C)  It is reduced to 1/4 the original pressure. 
D)  It is reduced to 1/8 the original pressure. 
E)  It remains the same as the original pressure. 
A)  It is increased by a factor of four. 
B)  It is increased by a factor of eight. 
C)  It is reduced to 1/4 the original pressure. 
D)  It is reduced to 1/8 the original pressure. 
E)  It remains the same as the original pressure.

Question 5

When the external pressure on a balloon is decreased at constant temperature, what happens to the gas inside?

Accepted Answer

A)  The collisions become more elastic. 
B)  The gas undergoes no changes. 
C)  The volume increases. 
D)  The molecules increase in rate of movement. 
E)  The volume decreases. 
A)  The collisions become more elastic. 
B)  The gas undergoes no changes. 
C)  The volume increases. 
D)  The molecules increase in rate of movement. 
E)  The volume decreases.

Question 6

Which statement summarizes Charles's Law?

Accepted Answer

A)  The volume of a fixed amount of gas at a constant temperature is inversely proportional to its pressure. 
B)  The pressure of a variable amount of gas at different pressures is directly proportional to its absolute temperature. 
C)  The volume of a fixed amount of gas at a constant pressure is directly proportional to its absolute temperature. 
D)  The volume of a fixed amount of gas at a constant pressure is inversely proportional to its absolute temperature. 
E)  The pressure of a fixed amount of gas at variable pressure is directly proportional to its absolute temperature. 
A)  The volume of a fixed amount of gas at a constant temperature is inversely proportional to its pressure. 
B)  The pressure of a variable amount of gas at different pressures is directly proportional to its absolute temperature. 
C)  The volume of a fixed amount of gas at a constant pressure is directly proportional to its absolute temperature. 
D)  The volume of a fixed amount of gas at a constant pressure is inversely proportional to its absolute temperature. 
E)  The pressure of a fixed amount of gas at variable pressure is directly proportional to its absolute temperature.

Question 7

What is the correct name for the atmospheric layer in which weather phenomena occur?

Accepted Answer

A)  ionosphere 
B)  thermosphere 
C)  mesosphere 
D)  stratosphere 
E)  troposphere 
A)  ionosphere 
B)  thermosphere 
C)  mesosphere 
D)  stratosphere 
E)  troposphere

Question 8

A mixture of He, Ne and Ar has a total pressure of 0.80 atm and is found to contain 0.55 mol He, 0.94 mol Ne and 0.35 mol Ar. What is the partial pressure (in atm) of each gas? He Ne Ar

Accepted Answer

A)  0.095 atm 0.16 atm 0.060 atm 
B)  0.44 atm 0.75 atm 0.28 atm 
C)  0.24 atm 0.41 atm 0.15 atm 
D)  2.7 atm 1.6 atm 4.2 atm 
E)  1.5 atm .85 atm 1.5 atm 
A)  0.095 atm 0.16 atm 0.060 atm 
B)  0.44 atm 0.75 atm 0.28 atm 
C)  0.24 atm 0.41 atm 0.15 atm 
D)  2.7 atm 1.6 atm 4.2 atm 
E)  1.5 atm .85 atm 1.5 atm

Question 9

If, at constant pressure, the absolute temperature of a flask equipped with a moveable piston is reduced to half its original absolute temperature, what must be the new volume?

Accepted Answer

A)  1/4 the original volume 
B)  1/2 the original volume 
C)  two times the original volume 
D)  four times the original volume 
E)  equal to the original volume 
A)  1/4 the original volume 
B)  1/2 the original volume 
C)  two times the original volume 
D)  four times the original volume 
E)  equal to the original volume

Question 10

Calculate the number of moles of a gas that occupy 7.3 × 103 mL at STP. The value of R = 0.0821 L atm mol-1 K-1.

Accepted Answer

A)  0.33 mol 
B)  3.1 mol 
C)  3.3 × 102 mol 
D)  2.4 × 104 mol 
E)  undefined due to division by zero 
A)  0.33 mol 
B)  3.1 mol 
C)  3.3 × 102 mol 
D)  2.4 × 104 mol 
E)  undefined due to division by zero

Question 11

Derive the gas constant (in L torr mol-1 K-1) given that 1.000 mole of a gas occupying 22.4 L at 0.00°C and 1.00 atm.

Accepted Answer

A)  1.22 × 10-3 L torr mol-1 K-1 
B)  8.21 × 10-2 L torr mol-1 K-1 
C)  1.60 × 10-2 L torr mol-1 K-1 
D)  62.3 L torr mol-1 K-1 
E)  undefined due to division by zero 
A)  1.22 × 10-3 L torr mol-1 K-1 
B)  8.21 × 10-2 L torr mol-1 K-1 
C)  1.60 × 10-2 L torr mol-1 K-1 
D)  62.3 L torr mol-1 K-1 
E)  undefined due to division by zero

Question 12

Calcium carbonate decomposes upon heating to form calcium oxide and carbon dioxide. A 1.75-g sample of calcium carbonate is placed in an empty, sealed 2.00-L steel container. The container is heated to 625°C and then allowed to cool to 25°C. What is the final pressure (in atm) inside the container? The value of R = 0.0821 L atm mol-1 K-1.

Accepted Answer

A)  0.21 atm 
B)  0.43 atm 
C)  0.64 atm 
D)  1.8 atm 
E)  59 atm 
A)  0.21 atm 
B)  0.43 atm 
C)  0.64 atm 
D)  1.8 atm 
E)  59 atm

Question 13

Which concept is not associated with the kinetic-molecular theory of gases?

Accepted Answer

A)  No energy is lost when gas molecules collide with each other. 
B)  Gas molecules move randomly in all possible directions at various speeds. 
C)  The average kinetic energy of gas molecules increases as the temperature increases. 
D)  Different gases with the same temperature, pressure, and volume behave much differently. 
E)  The forces of attraction and repulsion between separate gas molecules are minimal. 
A)  No energy is lost when gas molecules collide with each other. 
B)  Gas molecules move randomly in all possible directions at various speeds. 
C)  The average kinetic energy of gas molecules increases as the temperature increases. 
D)  Different gases with the same temperature, pressure, and volume behave much differently. 
E)  The forces of attraction and repulsion between separate gas molecules are minimal.

Question 14

Which is a summary of Avogadro's Law?

Accepted Answer

A)  At constant temperature and pressure, the volume of a gas is equal to the number of moles of the gas. 
B)  At constant temperature and pressure, the volume of a gas is inversely proportional to the number of moles of the gas. 
C)  At variable temperature and pressure, the volume of a gas is directly proportional to the number of moles of the gas. 
D)  At constant temperature and pressure, the volume of a gas is not related to the number of moles of the gas. 
E)  At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles of the gas. 
A)  At constant temperature and pressure, the volume of a gas is equal to the number of moles of the gas. 
B)  At constant temperature and pressure, the volume of a gas is inversely proportional to the number of moles of the gas. 
C)  At variable temperature and pressure, the volume of a gas is directly proportional to the number of moles of the gas. 
D)  At constant temperature and pressure, the volume of a gas is not related to the number of moles of the gas. 
E)  At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles of the gas.

Question 15

What is the density of oxygen gas (O2) at STP? R = 0.0821 L atm mol-1 K-1.

Accepted Answer

A)  1.43 g/L 
B)  0.714 g/L 
C)  1.31 g/L 
D)  1090 g/L 
E)  716 g/L 
A)  1.43 g/L 
B)  0.714 g/L 
C)  1.31 g/L 
D)  1090 g/L 
E)  716 g/L

Question 16

Which is a mathematical representation of Avogadro's Law?

Accepted Answer

A)  V = constant × n 
B)  n = constant 
C)  1/T = constant 
D)  n/V = constant 
E)  P/V = constant 
A)  V = constant × n 
B)  n = constant 
C)  1/T = constant 
D)  n/V = constant 
E)  P/V = constant

Question 17

What is the correct name for the atmospheric layer in which commercial jets fly?

Accepted Answer

A)  ionosphere 
B)  thermosphere 
C)  mesosphere 
D)  stratosphere 
E)  troposphere 
A)  ionosphere 
B)  thermosphere 
C)  mesosphere 
D)  stratosphere 
E)  troposphere

Question 18

A mixture of H2(g) and Cl2(g) exerts a total pressure of 2.50 atm. If the mole fraction of H2 is 0.490, what is the partial pressure (in atm) of H2?

Accepted Answer

A)  0.253 atm 
B)  0.396 atm 
C)  0.606 atm 
D)  1.23 atm 
E)  2.50 atm 
A)  0.253 atm 
B)  0.396 atm 
C)  0.606 atm 
D)  1.23 atm 
E)  2.50 atm

Question 19

Which description of the kinetic-molecular theory of gases is true?

Accepted Answer

A)  The space between two gas molecules is much greater than the size of each gas molecule. 
B)  The forces of attraction and repulsion do not exist for gas molecules. 
C)  Colliding gas molecules have the same speed before and after the collision. 
D)  Gas molecules move randomly in all directions with the same speed. 
E)  Gas molecules lose energy with every collision and will eventually stop moving. 
A)  The space between two gas molecules is much greater than the size of each gas molecule. 
B)  The forces of attraction and repulsion do not exist for gas molecules. 
C)  Colliding gas molecules have the same speed before and after the collision. 
D)  Gas molecules move randomly in all directions with the same speed. 
E)  Gas molecules lose energy with every collision and will eventually stop moving.

Question 20

Solid potassium chlorate can be decomposed to produce potassium chloride and oxygen according to the following equation.  How many grams of KClO3 are needed to produce 752 mL of oxygen at 23°C and 0.995 atm, if the oxygen is collected over water? The vapor pressure of water at this temperature is 21.07 torr.

Accepted Answer

A)  0.0308 g 
B)  2.43 g 
C)  2.52 g 
D)  3.66 g 
E)  3.77 g 
A)  0.0308 g 
B)  2.43 g 
C)  2.52 g 
D)  3.66 g 
E)  3.77 g

Arrange the following gaseous substances in order of decreasing average molecular speed at 25°C.

Based on temperature, there are four main layers to our atmosphere. What is the correct name for the layer in which we live?

Aluminum and oxygen react to form aluminum oxide. How many L of oxygen at 296 K and 1.4 atm of pressure are necessary to form 3.25 g of aluminum oxide? R = 0.0821 L atm mol^-1 K^-1.

If, at constant temperature, the volume of a flask equipped with a moveable piston is reduced to 1/4 its original volume, what must happen to the pressure?

When the external pressure on a balloon is decreased at constant temperature, what happens to the gas inside?

Which statement summarizes Charles's Law?

What is the correct name for the atmospheric layer in which weather phenomena occur?

A mixture of He, Ne and Ar has a total pressure of 0.80 atm and is found to contain 0.55 mol He, 0.94 mol Ne and 0.35 mol Ar. What is the partial pressure (in atm) of each gas? He Ne Ar

If, at constant pressure, the absolute temperature of a flask equipped with a moveable piston is reduced to half its original absolute temperature, what must be the new volume?

Calculate the number of moles of a gas that occupy 7.3 × 10³ mL at STP. The value of R = 0.0821 L atm mol^-1 K^-1.

Derive the gas constant (in L torr mol^-1 K^-1) given that 1.000 mole of a gas occupying 22.4 L at 0.00°C and 1.00 atm.

Which concept is not associated with the kinetic-molecular theory of gases?

Which is a summary of Avogadro's Law?

What is the density of oxygen gas (O₂) at STP? R = 0.0821 L atm mol^-1 K^-1.

Which is a mathematical representation of Avogadro's Law?

What is the correct name for the atmospheric layer in which commercial jets fly?

A mixture of H₂(g) and Cl₂(g) exerts a total pressure of 2.50 atm. If the mole fraction of H₂ is 0.490, what is the partial pressure (in atm) of H₂?

Which description of the kinetic-molecular theory of gases is true?

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Exam 10: Gases and the Atmosphere

Arrange the following gaseous substances in order of decreasing average molecular speed at 25°C.

Based on temperature, there are four main layers to our atmosphere. What is the correct name for the layer in which we live?

Aluminum and oxygen react to form aluminum oxide. How many L of oxygen at 296 K and 1.4 atm of pressure are necessary to form 3.25 g of aluminum oxide? R = 0.0821 L atm mol-1 K-1.

If, at constant temperature, the volume of a flask equipped with a moveable piston is reduced to 1/4 its original volume, what must happen to the pressure?

When the external pressure on a balloon is decreased at constant temperature, what happens to the gas inside?

Which statement summarizes Charles's Law?

What is the correct name for the atmospheric layer in which weather phenomena occur?

A mixture of He, Ne and Ar has a total pressure of 0.80 atm and is found to contain 0.55 mol He, 0.94 mol Ne and 0.35 mol Ar. What is the partial pressure (in atm) of each gas? He Ne Ar

If, at constant pressure, the absolute temperature of a flask equipped with a moveable piston is reduced to half its original absolute temperature, what must be the new volume?

Calculate the number of moles of a gas that occupy 7.3 × 103 mL at STP. The value of R = 0.0821 L atm mol-1 K-1.

Derive the gas constant (in L torr mol-1 K-1) given that 1.000 mole of a gas occupying 22.4 L at 0.00°C and 1.00 atm.

Which concept is not associated with the kinetic-molecular theory of gases?

Which is a summary of Avogadro's Law?

What is the density of oxygen gas (O2) at STP? R = 0.0821 L atm mol-1 K-1.

Which is a mathematical representation of Avogadro's Law?

What is the correct name for the atmospheric layer in which commercial jets fly?

A mixture of H2(g) and Cl2(g) exerts a total pressure of 2.50 atm. If the mole fraction of H2 is 0.490, what is the partial pressure (in atm) of H2?

Which description of the kinetic-molecular theory of gases is true?

The Nature of Chemistry

Atoms and Elements

Chemical Compounds

Quantities of Reactants and Products

Chemical Reactions

Energy and Chemical Reactions

Electron Configurations and the Periodic Table

Covalent Bonding

Molecular Structure

Liquids, Solids, and Materials

Chemical Kinetics: Rates of Reactions

Chemical Equilibrium

The Chemistry of Solutes and Solutions

Acids and Bases

Additional Aqueous Equilibria

Thermodynamics: Directionality of Chemical Reactions

Electrochemistry and Its Applications

Nuclear Chemistry

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Aluminum and oxygen react to form aluminum oxide. How many L of oxygen at 296 K and 1.4 atm of pressure are necessary to form 3.25 g of aluminum oxide? R = 0.0821 L atm mol^-1 K^-1.

Calculate the number of moles of a gas that occupy 7.3 × 10³ mL at STP. The value of R = 0.0821 L atm mol^-1 K^-1.

Derive the gas constant (in L torr mol^-1 K^-1) given that 1.000 mole of a gas occupying 22.4 L at 0.00°C and 1.00 atm.

What is the density of oxygen gas (O₂) at STP? R = 0.0821 L atm mol^-1 K^-1.

A mixture of H₂(g) and Cl₂(g) exerts a total pressure of 2.50 atm. If the mole fraction of H₂ is 0.490, what is the partial pressure (in atm) of H₂?