Question 1

Two gases start to escape from a container and one of the gases effuses 1.25 times as fast as the other one.The two gases could have been ________.

Accepted Answer

A) NO and SF6 
B) CO and CO2 
C) CO2 and Cl2 
D) Cl2 and CO 
E) CO2 and SF6 
A) NO and SF6 
B) CO and CO2 
C) CO2 and Cl2 
D) Cl2 and CO 
E) CO2 and SF6 B

Question 2

Of the following,________ is a valid statement of Charles' law.

Accepted Answer

A)    = constant 
B)    = constant 
C) PV = constant 
D) V = constant × n 
E) V = constant × P 
A)    = constant 
B)    = constant 
C) PV = constant 
D) V = constant × n 
E) V = constant × P B

Question 3

"Isothermal" means ________.

Accepted Answer

A) at constant pressure 
B) at constant temperature 
C) at variable temperature and pressure conditions 
D) at ideal temperature and pressure conditions 
E) that ΔHrxn = 0 
A) at constant pressure 
B) at constant temperature 
C) at variable temperature and pressure conditions 
D) at ideal temperature and pressure conditions 
E) that ΔHrxn = 0 B

Question 4

A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 9.60 cm.Atmospheric pressure was 783 mm Hg.The pressure of the argon in the container was ________ mm Hg.

Accepted Answer

A) 96.0 
B) 661 
C) 773 
D) 793 
E) 882 
A) 96.0 
B) 661 
C) 773 
D) 793 
E) 882

Question 5

At 500 °C,which of the following gases will have the greatest root-mean-square speed?

Accepted Answer

A) N2O 
B) UF6 
C) O2 
D) NH3 
E) None. The molecules of all gases have the same root-mean-square speed at any given temperature. 
A) N2O 
B) UF6 
C) O2 
D) NH3 
E) None. The molecules of all gases have the same root-mean-square speed at any given temperature.

Question 6

Molecular compounds of low molecular weight tend to be gases at room temperature.Which of the following is most likely not a gas at room temperature?

Accepted Answer

A) KBr 
B) F2 
C) HCN 
D) SO2 
E) CH4 
A) KBr 
B) F2 
C) HCN 
D) SO2 
E) CH4

Question 7

Which of the following gases would have a similar rate of effusion to CO at 350 K?

Accepted Answer

A) H2 
B) He 
C) CO2 
D) N2 
E) NO2 
A) H2 
B) He 
C) CO2 
D) N2 
E) NO2

Question 8

The thermal decomposition of potassium chlorate can be used to produce oxygen in the laboratory. 2KClO3 (s)→ 2KCl (s)+ 3O2 (g)
What volume (L)of O2 gas at 25 °C and 1.00 atm pressure is produced by the decomposition of 7.5 g of KClO3 (s)?

Accepted Answer

A) 4.5 
B) 7.5 
C) 2.3 
D) 3.7 
E) 11 
A) 4.5 
B) 7.5 
C) 2.3 
D) 3.7 
E) 11

Question 9

What volume (L)of HCl gas is required to react with an excess of sodium to generate 19.5 L of hydrogen gas at 1.31 atm and 51.0 °C?

Accepted Answer

The answer of What volume (L)of HCl gas is required...

Question 10

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 26.5 L of N2 at 22.0 °C and 1.10 atm?

Accepted Answer

A) 52.2 
B) 700. 
C) 0.807 
D) 1.21 
E) 1.10 
A) 52.2 
B) 700. 
C) 0.807 
D) 1.21 
E) 1.10

Question 11

The pressure exerted by 1.0 mol of gas in a 13 L flask at 22 °C is ________ kPa.

Accepted Answer

A) 560 
B) 190 
C) 18 
D) 2.4 
E) 1.0 
A) 560 
B) 190 
C) 18 
D) 2.4 
E) 1.0

Question 12

A 0.133 mol sample of gas in a 525 mL container has a pressure of 312 torr.The temperature of the gas is ________ °C.

Accepted Answer

A) 20.3 
B) -253 
C) -20.3 
D) 203 
E) 22.4 
A) 20.3 
B) -253 
C) -20.3 
D) 203 
E) 22.4

Question 13

A helium balloon is filled to a volume of 27.7 L at 300 K.What will the volume of the balloon become if the balloon is heated to raise the temperature to 392 K?

Accepted Answer

A) 36.2 
B) 21.2 
C) 0.0276 
D) 0.0472 
E) 3,260,000 
A) 36.2 
B) 21.2 
C) 0.0276 
D) 0.0472 
E) 3,260,000

Question 14

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

Accepted Answer

A) 4.02 
B) 10.3 
C) 1.60 
D) 0.292 
E) 6.31 
A) 4.02 
B) 10.3 
C) 1.60 
D) 0.292 
E) 6.31

Question 15

Using the van der Waals equation,the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at   is ________ atm. (a = 0.211 L2-atm/mol2,b = 0.0171 L/mol)

Accepted Answer

A) 0.730 
B) 1.00 
C) 1.21 
D) 1.37 
E) 0.367 
A) 0.730 
B) 1.00 
C) 1.21 
D) 1.37 
E) 0.367

Question 16

CO (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) 10.3 
B) 4.02 
C) 6.31 
D) 0.292 
E) 1.60 
A) 10.3 
B) 4.02 
C) 6.31 
D) 0.292 
E) 1.60

Question 17

A sample of gas (24.2 g)initially at 4.00 atm was compressed from 8.00 L to 2.00 L at constant temperature.After the compression,the gas pressure was ________ atm.

Accepted Answer

A) 4.00 
B) 2.00 
C) 1.00 
D) 8.00 
E) 16.0 
A) 4.00 
B) 2.00 
C) 1.00 
D) 8.00 
E) 16.0

Question 18

One significant difference between gases and liquids is that ________.

Accepted Answer

A) a gas is made up of molecules 
B) a gas expands to fill its container 
C) a gas may consist of both elements and compounds 
D) gases are always mixtures 
E) All of the above answers are correct. 
A) a gas is made up of molecules 
B) a gas expands to fill its container 
C) a gas may consist of both elements and compounds 
D) gases are always mixtures 
E) All of the above answers are correct.

Question 19

What is the volume (in m3)of a 0.25 mol of an unknown gas at a pressure of 545.3 mm Hg and 15 °C?

Accepted Answer

A) 8.1 × 10-5 
B) 18.2 × 10-3 
C) 4.3 × 10-4 
D) 2.2 × 10-1 
E) 1.2 × 10-4 
A) 8.1 × 10-5 
B) 18.2 × 10-3 
C) 4.3 × 10-4 
D) 2.2 × 10-1 
E) 1.2 × 10-4

Question 20

Arrange the following gases in order of increasing average molecular speed at 25 °C. Cl2,O2,F2,N2

Accepted Answer

A) Cl2 2 2 2 
B) Cl2 2 2 2 
C) N2 2 2 2 
D) Cl2 2 2 2 
E) F2 2 2 2 
A) Cl2 2 2 2 
B) Cl2 2 2 2 
C) N2 2 2 2 
D) Cl2 2 2 2 
E) F2 2 2 2

Exam 10: Gases

Two gases start to escape from a container and one of the gases effuses 1.25 times as fast as the other one.The two gases could have been ________.

Of the following,________ is a valid statement of Charles' law.

"Isothermal" means ________.

A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 9.60 cm.Atmospheric pressure was 783 mm Hg.The pressure of the argon in the container was ________ mm Hg.

At 500 °C,which of the following gases will have the greatest root-mean-square speed?

Molecular compounds of low molecular weight tend to be gases at room temperature.Which of the following is most likely not a gas at room temperature?

Which of the following gases would have a similar rate of effusion to CO at 350 K?

The thermal decomposition of potassium chlorate can be used to produce oxygen in the laboratory. 2KClO3 (s)→ 2KCl (s)+ 3O2 (g) What volume (L)of O2 gas at 25 °C and 1.00 atm pressure is produced by the decomposition of 7.5 g of KClO3 (s)?

What volume (L)of HCl gas is required to react with an excess of sodium to generate 19.5 L of hydrogen gas at 1.31 atm and 51.0 °C?

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 26.5 L of N2 at 22.0 °C and 1.10 atm?

The pressure exerted by 1.0 mol of gas in a 13 L flask at 22 °C is ________ kPa.

A 0.133 mol sample of gas in a 525 mL container has a pressure of 312 torr.The temperature of the gas is ________ °C.

A helium balloon is filled to a volume of 27.7 L at 300 K.What will the volume of the balloon become if the balloon is heated to raise the temperature to 392 K?

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

Using the van der Waals equation,the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at is ________ atm. (a = 0.211 L2-atm/mol2,b = 0.0171 L/mol)

CO (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.

A sample of gas (24.2 g)initially at 4.00 atm was compressed from 8.00 L to 2.00 L at constant temperature.After the compression,the gas pressure was ________ atm.

One significant difference between gases and liquids is that ________.

What is the volume (in m3)of a 0.25 mol of an unknown gas at a pressure of 545.3 mm Hg and 15 °C?

Arrange the following gases in order of increasing average molecular speed at 25 °C. Cl2,O2,F2,N2

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

The thermal decomposition of potassium chlorate can be used to produce oxygen in the laboratory. 2KClO₃ (s)→ 2KCl (s)+ 3O₂ (g) What volume (L)of O₂ gas at 25 °C and 1.00 atm pressure is produced by the decomposition of 7.5 g of KClO₃ (s)?

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 26.5 L of N₂ at 22.0 °C and 1.10 atm?

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

Using the van der Waals equation,the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at is ________ atm. (a = 0.211 L²-atm/mol²,b = 0.0171 L/mol)

CO (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.

What is the volume (in m³)of a 0.25 mol of an unknown gas at a pressure of 545.3 mm Hg and 15 °C?

Arrange the following gases in order of increasing average molecular speed at 25 °C. Cl₂,O₂,F₂,N₂