Question 1

If the temperature is lowered from 60 °C to 30 °C,the volume of a fixed amount of gas will be one half the original volume.

Accepted Answer

A) True 
 B)False

Question 2

A sample of H2 gas (5.0 mol)effused through a pinhole in 10.5 s.It will take ________ s for the same amount of O2 to effuse under the same conditions.

Accepted Answer

A) 5.25 
B) 42.0 
C) 2.63 
D) 168 
E) 21.0 
A) 5.25 
B) 42.0 
C) 2.63 
D) 168 
E) 21.0

Question 3

A mixture of He and Ne at a total pressure of 0.95 atm is found to contain 0.32 mol of He and 0.56 mol of Ne.The partial pressure of Ne is ________ atm.

Accepted Answer

A) 1.7 
B) 1.5 
C) 0.60 
D) 0.35 
E) 1.0 
A) 1.7 
B) 1.5 
C) 0.60 
D) 0.35 
E) 1.0

Question 4

Which of the following is not part of the kinetic-molecular theory?

Accepted Answer

A) Atoms are neither created nor destroyed by ordinary chemical reactions. 
B) Attractive and repulsive forces between gas molecules are negligible. 
C) Gases consist of molecules in continuous, random motion. 
D) Collisions between gas molecules do not result in the loss of energy. 
E) The volume occupied by all of the gas molecules in a container is negligible compared to the volume of the container. 
A) Atoms are neither created nor destroyed by ordinary chemical reactions. 
B) Attractive and repulsive forces between gas molecules are negligible. 
C) Gases consist of molecules in continuous, random motion. 
D) Collisions between gas molecules do not result in the loss of energy. 
E) The volume occupied by all of the gas molecules in a container is negligible compared to the volume of the container.

Question 5

What is the density of nitrogen dioxide gas (g/L)contained in a 4.77 L pressure tank at 738.4 mm Hg and 45.0 °C?

Accepted Answer

A) 1.71 
B) 1300 
C) 12.1 
D) 0.0169 
E) 8.17 
A) 1.71 
B) 1300 
C) 12.1 
D) 0.0169 
E) 8.17

Question 6

The amount of gas that occupies 60.82 L at 31.0 °C and 367 mm Hg is ________ mol.

Accepted Answer

A) 1.18 
B) 0.850 
C) 894 
D) 11.6 
E) 0.120 
A) 1.18 
B) 0.850 
C) 894 
D) 11.6 
E) 0.120

Question 7

The ________ corrects the ideal gas law for the finite volume and attractive forces of gas molecules.

Accepted Answer

van der Wa

Question 8

At standard pressure and 373 K,a 0.333-g sample of an unknown pure gas occupies a volume of 0.255 L.What is the identity of the gas?

Accepted Answer

A) xenon 
B) argon 
C) neon 
D) helium 
E) krypton 
A) xenon 
B) argon 
C) neon 
D) helium 
E) krypton

Question 9

Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 2NaN3 (s)→ 2Na (s)+ 3N2 (g).
What mass (g)of NaN3 is required to provide 40.0 L of N2 at 25.0 °C and 763 torr?

Accepted Answer

A) 1.64 
B) 1.09 
C) 160 
D) 71.1 
E) 107 
A) 1.64 
B) 1.09 
C) 160 
D) 71.1 
E) 107

Question 10

The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl: Ni(CO)4 (l)→ Ni (s)+ 4CO (g).
What volume (L)of CO is formed from the complete decomposition of 444 g of Ni(CO)4 at 752 torr and 22.0 °C?

Accepted Answer

A) 0.356 
B) 63.7 
C) 255 
D) 20.2 
E) 11.0 
A) 0.356 
B) 63.7 
C) 255 
D) 20.2 
E) 11.0

Question 11

The temperature of a sample of CH4 gas (10.34 g)in a 50.0 L vessel at 1.33 atm is ________ °C.

Accepted Answer

A) 984 
B) -195 
C) 195 
D) 1260 
E) -1260 
A) 984 
B) -195 
C) 195 
D) 1260 
E) -1260

Question 12

The molecular weight of a gas that has a density of 7.10 g/L at 25.0 °C and 1.00 atm pressure is ________ g/mol.

Accepted Answer

A) 174 
B) 14.6 
C) 28.0 
D) 5.75 × 10-3 
E) 6.85 × 10-2 
A) 174 
B) 14.6 
C) 28.0 
D) 5.75 × 10-3 
E) 6.85 × 10-2

Question 13

According to kinetic-molecular theory,if the temperature of a gas is raised from 100 °C to 200 °C,the average kinetic energy of the gas will ________.

Accepted Answer

A) double 
B) increase by a factor of 1.27 
C) increase by a factor of 100 
D) decrease by half 
E) decrease by a factor of 100 
A) double 
B) increase by a factor of 1.27 
C) increase by a factor of 100 
D) decrease by half 
E) decrease by a factor of 100

Question 14

Carbon dioxide and an unknown gas start to effuse from a container and the carbon dioxide takes 4.69 times as long to escape as the unknown gas.What is the identity of the unknown gas?

Accepted Answer

A) (Br2) 
B) NO2 
C) HCl 
D) CO 
E) H2 
A) (Br2) 
B) NO2 
C) HCl 
D) CO 
E) H2

Question 15

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 37.0 °C and 1.00 atm.The reaction of 6.00 kg of bicarbonate with excess hydrochloric acid under these conditions will produce ________ L of CO2.

Accepted Answer

A) 1.09 × 102 
B) 2.85 × 104 
C) 1.82 × 104 
D) 8.70 × 102 
E) 1.82 × 103 
A) 1.09 × 102 
B) 2.85 × 104 
C) 1.82 × 104 
D) 8.70 × 102 
E) 1.82 × 103

Question 16

What is the molecular weight (g/mol)of an unknown gas that has a density of 4.90 g/L at STP?

Accepted Answer

A) 1.10 × 10-2 
B) 1.20 × 102 
C) 1.10 × 102 
D) 1.20 × 10-2 
E) 1.10 
A) 1.10 × 10-2 
B) 1.20 × 102 
C) 1.10 × 102 
D) 1.20 × 10-2 
E) 1.10

Question 17

A sample of a gas (5.0 mol)at 1.0 atm is expanded at constant temperature from 10 L to 15 L.The final pressure is ________ atm.

Accepted Answer

A) 1.5 
B) 7.5 
C) 0.67 
D) 3.3 
E) 15 
A) 1.5 
B) 7.5 
C) 0.67 
D) 3.3 
E) 15

Question 18

The temperature and pressure specified by STP are ________ °C and ________ atm.

Accepted Answer

The answer of The temperature and pressure specified by STP...

Question 19

SO2 (5.00 g)and CO2 (5.00 g)were placed in a 750.0 mL container at 50.0 °C.The total pressure in the container was ________ atm.

Accepted Answer

A) 0.192 
B) 4.02 
C) 2.76 
D) 6.78 
E) 1.60 
A) 0.192 
B) 4.02 
C) 2.76 
D) 6.78 
E) 1.60

Question 20

The volume of 1.26 mol of gas at 69.4 kPa and 25.30 °C is ________ L.

Accepted Answer

A) 45.1 
B) 633 
C) 3.82 
D) 0.445 
E) 0.439 
A) 45.1 
B) 633 
C) 3.82 
D) 0.445 
E) 0.439

Exam 10: Gases

If the temperature is lowered from 60 °C to 30 °C,the volume of a fixed amount of gas will be one half the original volume.

A sample of H2 gas (5.0 mol)effused through a pinhole in 10.5 s.It will take ________ s for the same amount of O2 to effuse under the same conditions.

A mixture of He and Ne at a total pressure of 0.95 atm is found to contain 0.32 mol of He and 0.56 mol of Ne.The partial pressure of Ne is ________ atm.

Which of the following is not part of the kinetic-molecular theory?

What is the density of nitrogen dioxide gas (g/L)contained in a 4.77 L pressure tank at 738.4 mm Hg and 45.0 °C?

The amount of gas that occupies 60.82 L at 31.0 °C and 367 mm Hg is ________ mol.

The ________ corrects the ideal gas law for the finite volume and attractive forces of gas molecules.

At standard pressure and 373 K,a 0.333-g sample of an unknown pure gas occupies a volume of 0.255 L.What is the identity of the gas?

Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 2NaN3 (s)→ 2Na (s)+ 3N2 (g). What mass (g)of NaN3 is required to provide 40.0 L of N2 at 25.0 °C and 763 torr?

The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl: Ni(CO)4 (l)→ Ni (s)+ 4CO (g). What volume (L)of CO is formed from the complete decomposition of 444 g of Ni(CO)4 at 752 torr and 22.0 °C?

The temperature of a sample of CH4 gas (10.34 g)in a 50.0 L vessel at 1.33 atm is ________ °C.

The molecular weight of a gas that has a density of 7.10 g/L at 25.0 °C and 1.00 atm pressure is ________ g/mol.

According to kinetic-molecular theory,if the temperature of a gas is raised from 100 °C to 200 °C,the average kinetic energy of the gas will ________.

Carbon dioxide and an unknown gas start to effuse from a container and the carbon dioxide takes 4.69 times as long to escape as the unknown gas.What is the identity of the unknown gas?

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 37.0 °C and 1.00 atm.The reaction of 6.00 kg of bicarbonate with excess hydrochloric acid under these conditions will produce ________ L of CO2.

What is the molecular weight (g/mol)of an unknown gas that has a density of 4.90 g/L at STP?

A sample of a gas (5.0 mol)at 1.0 atm is expanded at constant temperature from 10 L to 15 L.The final pressure is ________ atm.

The temperature and pressure specified by STP are ________ °C and ________ atm.

SO2 (5.00 g)and CO2 (5.00 g)were placed in a 750.0 mL container at 50.0 °C.The total pressure in the container was ________ atm.

The volume of 1.26 mol of gas at 69.4 kPa and 25.30 °C is ________ L.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

A sample of H₂ gas (5.0 mol)effused through a pinhole in 10.5 s.It will take ________ s for the same amount of O₂ to effuse under the same conditions.

Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 2NaN₃ (s)→ 2Na (s)+ 3N₂ (g). What mass (g)of NaN₃ is required to provide 40.0 L of N₂ at 25.0 °C and 763 torr?

The Mond process produces pure nickel metal via the thermal decomposition of nickel tetracarbonyl: Ni(CO)₄ (l)→ Ni (s)+ 4CO (g). What volume (L)of CO is formed from the complete decomposition of 444 g of Ni(CO)₄at 752 torr and 22.0 °C?

The temperature of a sample of CH₄ gas (10.34 g)in a 50.0 L vessel at 1.33 atm is ________ °C.

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 37.0 °C and 1.00 atm.The reaction of 6.00 kg of bicarbonate with excess hydrochloric acid under these conditions will produce ________ L of CO₂.

The temperature and pressure specified by STP are °C and atm.

SO₂ (5.00 g)and CO₂ (5.00 g)were placed in a 750.0 mL container at 50.0 °C.The total pressure in the container was ________ atm.