Question 1

The density of neon gas will be greatest at:

Accepted Answer

A)   0  C and 1 atm
B)   273   C and 1.5 atm
C)   0  C and 2 atm
D)   273  C and 1 atm
E)   The density of neon will be the same for all of the above cases.F) B) and D)
G) All of the above

Question 2

Which of the following can explain the increase in pressure that results from decreasing the volume of a fixed amount of gas at a fixed temperature?

Accepted Answer

A)   The gas molecules move faster and therefore hit the walls of the container with more force.
B)   The gas molecules have a shorter path between the walls of the container and therefore collide with the walls more frequently.
C)   The gas molecules increase in their apparent mass therefore exerting more force when they strike the walls of the container.
D)   The gas molecules collide less with each other therefore having more force to exert on the walls of the container.
E)   None of these.F) B) and C)
G) A) and B)

Question 3

A small gas cylinder of helium used in chemistry lecture demonstrations has a volume of 275 mL at a pressure of 1823 kPa at 24.7°C. Use this information to answer
-At what temperature in degrees Celsius would the helium gas in the cylinder exhibit a pressure of 25.0 atm?

Accepted Answer

A)   4.96°C
B)   34.3°C
C)   58.8°C
D)   140°C
E)   307°CF) A) and D)
G) A) and B)

Question 4

A gas cylinder contains the following mixture of gases: 10 g H2, 15 g CH4, 20 g SO2 and 12 g Ar. Which gas exerts the largest partial pressure in the container?

Accepted Answer

A)   H2
B)   CH4
C)   SO2
D)   Ar
E)   all exert the same pressureF) A) and B)
G) None of the above

Question 5

235U (234.040947 amu) and 238U (235.043925 amu) are separated on the basis of the relative rates of diffusion of 235UF6 and 238UF6. Calculate the relative rates of diffusion of these two compounds.

Accepted Answer

1.0043:1, ²³⁵

Question 6

Which isn't one of the postulates of the kinetic molecular theory?

Accepted Answer

A)   At a constant temperature, all of the particles have the same speed.
B)   Gas particles are in constant motion.
C)   Gas particles move in a straight line between collisions.
D)   The volume of the particles is negligibly small compared to the volume of the container.
E)   There are no forces of attraction between gas particles.F) A) and E)
G) C) and E)

Question 7

What is the total pressure in atmospheres when 0.400 g of H2, 2.00 g of N2, and 10.5 g of CO2 are injected into a 10.0 liter flask at 273 K?

Accepted Answer

A)   0.571 atm
B)   0.877 atm
C)   1.14 atm
D)   1.75 atm
E)   it is impossible to determine the answer from the data givenF) A) and C)
G) D) and E)

Question 8

What is the volume, in liters, of 1.00 mole of an ideal gas at 25.0°C and 1.00 atm pressure?

Accepted Answer

A)   0.0409 L
B)   2.05 L
C)   22.4 L
D)   24.5 L
E)   none of the aboveF) A) and B)
G) B) and C)

Question 9

Until recently, materials had to be cooled to temperatures on the order of 4 K to become superconducting. A ceramic has been discovered that becomes superconducting at 92 K. Which of the following temperatures corresponds to 92 K?

Accepted Answer

A)   32 °F
B)   -181°C
C)   212°F
D)   181°C
E)   365 °CF) A) and B)
G) A) and C)

Question 10

What is the density of NO(g)  at 25.0°C and 783 mmHg?

Accepted Answer

A)   1.26 g/L
B)   2.68 g/L
C)   3.12 g/L
D)   3.76 g/L
E)   22.4 g/LF) All of the above
G) A) and E)

Question 11

If the average speed of O2 molecules at STP is 4.3 x 102 meters per second, what is the average speed of H2 molecules at the same temperature and pressure?

Accepted Answer

A)   1.1 x 102
B)   2.2 x 102
C)   8.6 x 102
D)   1.7 x 103
E)   none of the aboveF) None of the above
G) A) and E)

Question 12

2.11 moles of C3H8 are allowed to burn in the presence of excess O2 to form CO2 and H2O.

C3H8(g)  + 5 O2(g)    →\rightarrow→  3 CO2(g)  + 4 H2O(g) 
The carbon dioxide is isolated from all other gases and stored in a 1.25 L container at 0.00°C. What is the pressure in this container if the gas obeys the ideal gas equation?

Accepted Answer

A)   18 atm
B)   38 atm
C)   113 atm
D)   1,130 atm
E)   none of the above F) A) and D)
G) B) and E)

Question 13

A 2.91 gram sample of a gaseous compound that contains only boron and hydrogen has a volume of 1.22 L at 25°C and 1.09 atm. What is the formula of this compound?

Accepted Answer

A)   B2H6
B)   B4H10
C)   B5H9
D)   B6H10
E)   B6H12F) B) and E)
G) A) and C)

Question 14

A metal reacts with acid to form hydrogen gas as shown by the following equation.

M(s)  + 2 H+(aq)    →\rightarrow→  M2+(aq)  + H2(g) 
What is the atomic weight of this metal if 3.49 grams of the metal generates enough hydrogen collected over water to fill a bottle with a volume of 2.20 L at 25.0°C and 1.00 atmosphere pressure under conditions where the vapor pressure of the solution is 23.8 torr?

Accepted Answer

A)   19.4 g/mol
B)   37.6 g/mol
C)   38.8 g/mol
D)   40.0 g/mol
E)   none of the above F) A) and C)
G) All of the above

Question 15

Which of the following gases has a density of 1.72 g/L at 10°C and 1 atm pressure?

Accepted Answer

A)   He
B)   Ne
C)   Ar
D)   CH4
E)   P4F) All of the above
G) A) and B)

Question 16

Which of the following gases would have the largest density at 25°C and 1.00 atm pressure?

Accepted Answer

A)   methane, CH4
B)   acetylene, C2H2
C)   ethylene, C2H4
D)   ethane, C2H6
E)   propane, C3H8F) All of the above
G) A) and E)

Question 17

What is the empirical formula of the only product of the following reaction

__ N2O3(g)  + __ O3(g)    →\rightarrow→ 
If 3.00 L of N2O3 react completely with 1.00 L of O3 to give 6.00 L of the product, all gases measured at STP?

Accepted Answer

A)   NO
B)   NO2
C)   NO3
D)   N2O5
E)   none of the above F) A) and B)
G) C) and D)

Question 18

Use the Kinetic Molecular Theory of gases to explain why pressure of a gas is proportional to its temperature in a fixed volume container.

Accepted Answer

An increase in temperature causes an inc...

Question 19

At what temperature are the readings on the Celsius and Fahrenheit scales the same? At what temperature are the magnitudes the same but the signs different?

Accepted Answer

-40 °C = -...

Exam 6: Gases

Which of the following gases would have the largest density at 25°C and 1.00 atm pressure?

Correct Answer
verified

Which of the following can explain the increase in pressure that results from decreasing the volume of a fixed amount of gas at a fixed temperature?

Correct Answer
verified

Which isn't one of the postulates of the kinetic molecular theory?

Correct Answer
verified

A gas cylinder contains the following mixture of gases: 10 g H₂, 15 g CH₄, 20 g SO₂ and 12 g Ar. Which gas exerts the largest partial pressure in the container?

Correct Answer
verified

Correct Answer
verified

²³⁵U (234.040947 amu) and ²³⁸U (235.043925 amu) are separated on the basis of the relative rates of diffusion of ²³⁵UF₆ and ²³⁸UF₆. Calculate the relative rates of diffusion of these two compounds.

Correct Answer
verified
1.0043:1, ^{235View Answer}

What is the empirical formula of the only product of the following reaction N₂O₃(g) + O₃(g) $\rightarrow$ If 3.00 L of N₂O₃ react completely with 1.00 L of O₃ to give 6.00 L of the product, all gases measured at STP?

Correct Answer
verified

If the average speed of O₂ molecules at STP is 4.3 x 10² meters per second, what is the average speed of H₂ molecules at the same temperature and pressure?

Correct Answer
verified

Use the Kinetic Molecular Theory of gases to explain why pressure of a gas is proportional to its temperature in a fixed volume container.

Correct Answer
verified
An increase in temperature causes an inc...
View Answer

What is the density of NO(g) at 25.0°C and 783 mmHg?

Correct Answer
verified

Until recently, materials had to be cooled to temperatures on the order of 4 K to become superconducting. A ceramic has been discovered that becomes superconducting at 92 K. Which of the following temperatures corresponds to 92 K?

Correct Answer
verified

What is the volume, in liters, of 1.00 mole of an ideal gas at 25.0°C and 1.00 atm pressure?

Correct Answer
verified

At what temperature are the readings on the Celsius and Fahrenheit scales the same? At what temperature are the magnitudes the same but the signs different?

Correct Answer
verified
-40 °C = -...
View Answer

Correct Answer
verified

A 2.91 gram sample of a gaseous compound that contains only boron and hydrogen has a volume of 1.22 L at 25°C and 1.09 atm. What is the formula of this compound?

Correct Answer
verified

What is the total pressure in atmospheres when 0.400 g of H₂, 2.00 g of N₂, and 10.5 g of CO₂ are injected into a 10.0 liter flask at 273 K?

Correct Answer
verified

Which of the following gases has a density of 1.72 g/L at 10°C and 1 atm pressure?

Correct Answer
verified

A small gas cylinder of helium used in chemistry lecture demonstrations has a volume of 275 mL at a pressure of 1823 kPa at 24.7°C. Use this information to answer -At what temperature in degrees Celsius would the helium gas in the cylinder exhibit a pressure of 25.0 atm?

Correct Answer
verified

The density of neon gas will be greatest at:

Correct Answer
verified

Exam 6: Gases

Which of the following gases would have the largest density at 25°C and 1.00 atm pressure?

Correct AnswerverifiedShow Answer

Which of the following can explain the increase in pressure that results from decreasing the volume of a fixed amount of gas at a fixed temperature?

Correct AnswerverifiedShow Answer

Which isn't one of the postulates of the kinetic molecular theory?

Correct AnswerverifiedShow Answer

A gas cylinder contains the following mixture of gases: 10 g H2, 15 g CH4, 20 g SO2 and 12 g Ar. Which gas exerts the largest partial pressure in the container?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

235U (234.040947 amu) and 238U (235.043925 amu) are separated on the basis of the relative rates of diffusion of 235UF6 and 238UF6. Calculate the relative rates of diffusion of these two compounds.

Correct Answerverified1.0043:1, 235View AnswerShow Answer

What is the empirical formula of the only product of the following reaction __ N2O3(g) + __ O3(g) →\rightarrow→ If 3.00 L of N2O3 react completely with 1.00 L of O3 to give 6.00 L of the product, all gases measured at STP?

Correct AnswerverifiedShow Answer

If the average speed of O2 molecules at STP is 4.3 x 102 meters per second, what is the average speed of H2 molecules at the same temperature and pressure?

Correct AnswerverifiedShow Answer

Use the Kinetic Molecular Theory of gases to explain why pressure of a gas is proportional to its temperature in a fixed volume container.

Correct AnswerverifiedAn increase in temperature causes an inc...View AnswerShow Answer

What is the density of NO(g) at 25.0°C and 783 mmHg?

Correct AnswerverifiedShow Answer

Until recently, materials had to be cooled to temperatures on the order of 4 K to become superconducting. A ceramic has been discovered that becomes superconducting at 92 K. Which of the following temperatures corresponds to 92 K?

Correct AnswerverifiedShow Answer

What is the volume, in liters, of 1.00 mole of an ideal gas at 25.0°C and 1.00 atm pressure?

Correct AnswerverifiedShow Answer

At what temperature are the readings on the Celsius and Fahrenheit scales the same? At what temperature are the magnitudes the same but the signs different?

Correct Answerverified-40 °C = -...View AnswerShow Answer

Correct AnswerverifiedShow Answer

A 2.91 gram sample of a gaseous compound that contains only boron and hydrogen has a volume of 1.22 L at 25°C and 1.09 atm. What is the formula of this compound?

Correct AnswerverifiedShow Answer

What is the total pressure in atmospheres when 0.400 g of H2, 2.00 g of N2, and 10.5 g of CO2 are injected into a 10.0 liter flask at 273 K?

Correct AnswerverifiedShow Answer

Which of the following gases has a density of 1.72 g/L at 10°C and 1 atm pressure?

Correct AnswerverifiedShow Answer

A small gas cylinder of helium used in chemistry lecture demonstrations has a volume of 275 mL at a pressure of 1823 kPa at 24.7°C. Use this information to answer -At what temperature in degrees Celsius would the helium gas in the cylinder exhibit a pressure of 25.0 atm?

Correct AnswerverifiedShow Answer

The density of neon gas will be greatest at:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A gas cylinder contains the following mixture of gases: 10 g H₂, 15 g CH₄, 20 g SO₂ and 12 g Ar. Which gas exerts the largest partial pressure in the container?

Correct Answer
verified

Correct Answer
verified

²³⁵U (234.040947 amu) and ²³⁸U (235.043925 amu) are separated on the basis of the relative rates of diffusion of ²³⁵UF₆ and ²³⁸UF₆. Calculate the relative rates of diffusion of these two compounds.

Correct Answer
verified
1.0043:1, ^{235View Answer}

What is the empirical formula of the only product of the following reaction N₂O₃(g) + O₃(g) $\rightarrow$ If 3.00 L of N₂O₃ react completely with 1.00 L of O₃ to give 6.00 L of the product, all gases measured at STP?

Correct Answer
verified

If the average speed of O₂ molecules at STP is 4.3 x 10² meters per second, what is the average speed of H₂ molecules at the same temperature and pressure?

Correct Answer
verified

Correct Answer
verified
An increase in temperature causes an inc...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
-40 °C = -...
View Answer

Correct Answer
verified

Correct Answer
verified

What is the total pressure in atmospheres when 0.400 g of H₂, 2.00 g of N₂, and 10.5 g of CO₂ are injected into a 10.0 liter flask at 273 K?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified