Question 1

All the following are postulates of the kinetic-molecular theory of gases except:

Accepted Answer

A)  The collisions between molecules are elastic.
B)  The gas molecules are in constant motion.
C)  At a constant temperature,each molecule has the same kinetic energy.
D)  The volumes of the molecules are negligible compared with the volume of the container.
E)  The gas molecules are in rapid motion.

Question 2

The rate of effusion of an unknown gas was measured and found to be 11.9 mL/min.Under identical conditions,the rate of effusion of pure oxygen (O2) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be:

Accepted Answer

A)   2) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be: 
A)     
B)     
C)     
D)     
E)  none of these" class="answers-bank-image d-inline" rel="preload" >
B)   2) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be: 
A)     
B)     
C)     
D)     
E)  none of these" class="answers-bank-image d-inline" rel="preload" >
C)   2) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be: 
A)     
B)     
C)     
D)     
E)  none of these" class="answers-bank-image d-inline" rel="preload" >
D)   2) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be: 
A)     
B)     
C)     
D)     
E)  none of these" class="answers-bank-image d-inline" rel="preload" >
E)  none of these

Question 3

A sample of gas is in a 50.0-mL container at a pressure of 645 torr and a temperature of 25°C.The entire sample is heated to a temperature of 35°C and transferred to a new container whose volume is 98.7 mL.The pressure of the gas in the second container is about:

Accepted Answer

A)  457 torr
B)  316 torr
C)    torr
D)  65 torr
E)  338 torr

Question 4

A physics experiment is conducted at a pressure of 14.4 kPa.What is this pressure in mmHg?

Accepted Answer

A)  18.9 mmHg
B)  1.92 mmHg
C)    mmHg
D)  108 mmHg
E)    mmHg

Question 5

Which of the following would represent the greatest pressure?

Accepted Answer

A)  0.680 atm
B)  517 mmHg
C)  11.4 psi
D)  62106 Pa
E)  14.1 in Hg

Question 6

A gas sample is held at constant pressure.The gas occupies 3.62 L of volume when the temperature is 21.6°C.Determine the temperature at which the volume of the gas is 3.42 L.

Accepted Answer

A)  312 K
B)  278 K
C)  20.4 K
D)  295 K
E)  552 K

Question 7

Order the following in increasing rate of effusion: F2,Cl2,NO,NO2,CH4

Accepted Answer

A)  Cl2 2 2 4
B)  Cl2 2 2 4 
C)  CH4 2 2 2
D)  CH4 2 2 2
E)  F2 2 2 4

Question 8

What would happen to the average kinetic energy of the molecules of a gas sample if the temperature of the sample increased from 20°C to 40°C?

Accepted Answer

A)  It would double.
B)  It would increase.
C)  It would decrease.
D)  It would become half its value.
E)  Two of these.

Question 9

The bag is emptied and refilled,successively,with gases X and Y,this time at 1 atm pressure and a temperature 30°C higher.Assume that the volume of the bag is the same as before.Which one of the following statements is wrong?

Accepted Answer

A)  The full bag contains fewer molecules of each gas than it did at 0.0°C.
B)  The ratio of the density of gas Y to the density of gas X is the same as at 0.0°C.
C)  The molar masses of the two gases are the same as they were at 0.0°C.
D)  The mass of each gas filling the bag is now 303/273 times the mass held at 0.0°C.
E)  The average velocity of the molecules of gas X at 30°C is higher than it was at 0.0°C.

Question 10

The standard temperature for gases is

Accepted Answer

A)  100°C
B)  0°C
C)  32°C
D)  212°F
E)  0°F

Question 11

You are holding four identical balloons each containing 10.0 g of a different gas.The balloon containing which gas is the largest balloon?

Accepted Answer

A)  H2
B)  He
C)  Ne
D)  O2
E)  All have the same volume.

Question 12

Four identical 1.0-L flasks contain the gases He,Cl2,CH4,and NH3,each at 0°C and 1 atm pressure.
-For which gas are the collisions elastic?

Accepted Answer

A)  He
B)  Cl2
C)  CH4
D)  NH3
E)  all gases the same

Question 13

Which of the following is not an assumption of the kinetic molecular theory for a gas?

Accepted Answer

A)  Gases are made up of tiny particles in constant chaotic motion.
B)  Gas particles are very small compared to the average distance between the particles.
C)  Gas particles collide with the walls of their container in elastic collisions.
D)  The average velocity of the gas particles is directly proportional to the absolute temperature.
E)  All of the above are assumptions of the kinetic molecular theory.

Question 14

Four identical 1.0-L flasks contain the gases He,Cl2,CH4,and NH3,each at 0°C and 1 atm pressure.
-For which gas do the molecules have the smallest average kinetic energy?

Accepted Answer

A)  He
B)  Cl2
C)  CH4
D)  NH3
E)  all gases the same

Question 15

It is found that 250.mL of a gas at STP has a mass of 0.700 g.What is the molar mass?

Accepted Answer

A)  62.7 g/mol
B)  2.80 g/mol
C)  15.9 g/mol
D)  11.2 g/mol
E)  128 g/mol

Question 16

Four identical 1.0-L flasks contain the gases He,Cl2,CH4,and NH3,each at 0°C and 1 atm pressure.
-For which gas are the molecules diatomic?

Accepted Answer

A)  He
B)  Cl2
C)  CH4
D)  NH3
E)  all gases the same

Question 17

Three 1.00-L flasks at 25°C and 725 torr contain the gases CH4 (flask A) ,CO2 (flask B) ,and C2H6 (flask C) .
-In which single flask do the molecules have the greatest mass,the greatest average velocity,and the highest kinetic energy?

Accepted Answer

A)  Flask A
B)  Flask B
C)  Flask C
D)  All are the same.
E)  No one flask has all these.

Question 18

One way to isolate metals from their ores is to react the metal oxide with carbon as shown in the following reaction: 2 formed at 100°C and 1.50 atm,what is the identity of the metal? A) Hg B) Mg C) Cu D) Cd E) Zn" class="answers-bank-image d-inline" rel="preload" > If 34.08 g of a metal oxide reacted with excess carbon and 4.37 L of CO2 formed at 100°C and 1.50 atm,what is the identity of the metal?

Accepted Answer

A)  Hg
B)  Mg
C)  Cu
D)  Cd
E)  Zn

Question 19

A mixture is prepared from 15.0 L of ammonia and 15.0 L chlorine measured at the same conditions;these compounds react according to the following equation: 3,Cl2,N2,and HCl,respectively) ? Assume the final volumes are measured under identical conditions. A) 0.00 L,5.00 L,7.50 L,45.0 L B) 5.00 L,0.00 L,5.00 L,30.0 L C) 0.00 L,0.00 L,7.50 L,45.0 L D) 0.00 L,0.00 L,5.00 L,30.0 L E) 0.00 L,10.0 L,15.0 L,90.0 L" class="answers-bank-image d-inline" rel="preload" > When the reaction is completed,what is the volume of each gas (NH3,Cl2,N2,and HCl,respectively) ? Assume the final volumes are measured under identical conditions.

Accepted Answer

A)  0.00 L,5.00 L,7.50 L,45.0 L
B)  5.00 L,0.00 L,5.00 L,30.0 L
C)  0.00 L,0.00 L,7.50 L,45.0 L
D)  0.00 L,0.00 L,5.00 L,30.0 L
E)  0.00 L,10.0 L,15.0 L,90.0 L

Question 20

A mixture of KCl and KClO3 weighing 1.34 grams was heated;the dry O2 generated occupied 143 mL at STP.What percent of the original mixture was KClO3,which decomposes as follows: 3 weighing 1.34 grams was heated;the dry O2 generated occupied 143 mL at STP.What percent of the original mixture was KClO3,which decomposes as follows:   A) 38.9% B) 58.4% C) 87.6% D) 10.7% E) 23.7%" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  38.9%
B)  58.4%
C)  87.6%
D)  10.7%
E)  23.7%

Exam 5: Gases

One way to isolate metals from their ores is to react the metal oxide with carbon as shown in the following reaction: If 34.08 g of a metal oxide reacted with excess carbon and 4.37 L of CO₂ formed at 100°C and 1.50 atm,what is the identity of the metal?

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He,Cl₂,CH₄,and NH₃,each at 0°C and 1 atm pressure. -For which gas are the molecules diatomic?

Correct Answer
verified

A sample of gas is in a 50.0-mL container at a pressure of 645 torr and a temperature of 25°C.The entire sample is heated to a temperature of 35°C and transferred to a new container whose volume is 98.7 mL.The pressure of the gas in the second container is about:

Correct Answer
verified

The rate of effusion of an unknown gas was measured and found to be 11.9 mL/min.Under identical conditions,the rate of effusion of pure oxygen (O₂) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be:

Correct Answer
verified

You are holding four identical balloons each containing 10.0 g of a different gas.The balloon containing which gas is the largest balloon?

Correct Answer
verified

It is found that 250.mL of a gas at STP has a mass of 0.700 g.What is the molar mass?

Correct Answer
verified

A physics experiment is conducted at a pressure of 14.4 kPa.What is this pressure in mmHg?

Correct Answer
verified

Three 1.00-L flasks at 25°C and 725 torr contain the gases CH₄ (flask A) ,CO₂ (flask B) ,and C₂H₆ (flask C) . -In which single flask do the molecules have the greatest mass,the greatest average velocity,and the highest kinetic energy?

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He,Cl₂,CH₄,and NH₃,each at 0°C and 1 atm pressure. -For which gas do the molecules have the smallest average kinetic energy?

Correct Answer
verified

The standard temperature for gases is

Correct Answer
verified

Correct Answer
verified

Which of the following would represent the greatest pressure?

Correct Answer
verified

Order the following in increasing rate of effusion: F₂,Cl₂,NO,NO₂,CH₄

Correct Answer
verified

The bag is emptied and refilled,successively,with gases X and Y,this time at 1 atm pressure and a temperature 30°C higher.Assume that the volume of the bag is the same as before.Which one of the following statements is wrong?

Correct Answer
verified

Which of the following is not an assumption of the kinetic molecular theory for a gas?

Correct Answer
verified

A mixture of KCl and KClO₃ weighing 1.34 grams was heated;the dry O₂ generated occupied 143 mL at STP.What percent of the original mixture was KClO₃,which decomposes as follows:

Correct Answer
verified

All the following are postulates of the kinetic-molecular theory of gases except:

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He,Cl₂,CH₄,and NH₃,each at 0°C and 1 atm pressure. -For which gas are the collisions elastic?

Correct Answer
verified

A gas sample is held at constant pressure.The gas occupies 3.62 L of volume when the temperature is 21.6°C.Determine the temperature at which the volume of the gas is 3.42 L.

Correct Answer
verified

What would happen to the average kinetic energy of the molecules of a gas sample if the temperature of the sample increased from 20°C to 40°C?

Correct Answer
verified

Exam 5: Gases

One way to isolate metals from their ores is to react the metal oxide with carbon as shown in the following reaction: If 34.08 g of a metal oxide reacted with excess carbon and 4.37 L of CO2 formed at 100°C and 1.50 atm,what is the identity of the metal?

Correct AnswerverifiedShow Answer

Four identical 1.0-L flasks contain the gases He,Cl2,CH4,and NH3,each at 0°C and 1 atm pressure. -For which gas are the molecules diatomic?

Correct AnswerverifiedShow Answer

A sample of gas is in a 50.0-mL container at a pressure of 645 torr and a temperature of 25°C.The entire sample is heated to a temperature of 35°C and transferred to a new container whose volume is 98.7 mL.The pressure of the gas in the second container is about:

Correct AnswerverifiedShow Answer

The rate of effusion of an unknown gas was measured and found to be 11.9 mL/min.Under identical conditions,the rate of effusion of pure oxygen (O2) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be:

Correct AnswerverifiedShow Answer

You are holding four identical balloons each containing 10.0 g of a different gas.The balloon containing which gas is the largest balloon?

Correct AnswerverifiedShow Answer

It is found that 250.mL of a gas at STP has a mass of 0.700 g.What is the molar mass?

Correct AnswerverifiedShow Answer

A physics experiment is conducted at a pressure of 14.4 kPa.What is this pressure in mmHg?

Correct AnswerverifiedShow Answer

Three 1.00-L flasks at 25°C and 725 torr contain the gases CH4 (flask A) ,CO2 (flask B) ,and C2H6 (flask C) . -In which single flask do the molecules have the greatest mass,the greatest average velocity,and the highest kinetic energy?

Correct AnswerverifiedShow Answer

Four identical 1.0-L flasks contain the gases He,Cl2,CH4,and NH3,each at 0°C and 1 atm pressure. -For which gas do the molecules have the smallest average kinetic energy?

Correct AnswerverifiedShow Answer

The standard temperature for gases is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following would represent the greatest pressure?

Correct AnswerverifiedShow Answer

Order the following in increasing rate of effusion: F2,Cl2,NO,NO2,CH4

Correct AnswerverifiedShow Answer

The bag is emptied and refilled,successively,with gases X and Y,this time at 1 atm pressure and a temperature 30°C higher.Assume that the volume of the bag is the same as before.Which one of the following statements is wrong?

Correct AnswerverifiedShow Answer

Which of the following is not an assumption of the kinetic molecular theory for a gas?

Correct AnswerverifiedShow Answer

A mixture of KCl and KClO3 weighing 1.34 grams was heated;the dry O2 generated occupied 143 mL at STP.What percent of the original mixture was KClO3,which decomposes as follows:

Correct AnswerverifiedShow Answer

All the following are postulates of the kinetic-molecular theory of gases except:

Correct AnswerverifiedShow Answer

Four identical 1.0-L flasks contain the gases He,Cl2,CH4,and NH3,each at 0°C and 1 atm pressure. -For which gas are the collisions elastic?

Correct AnswerverifiedShow Answer

A gas sample is held at constant pressure.The gas occupies 3.62 L of volume when the temperature is 21.6°C.Determine the temperature at which the volume of the gas is 3.42 L.

Correct AnswerverifiedShow Answer

What would happen to the average kinetic energy of the molecules of a gas sample if the temperature of the sample increased from 20°C to 40°C?

Correct AnswerverifiedShow Answer

One way to isolate metals from their ores is to react the metal oxide with carbon as shown in the following reaction: If 34.08 g of a metal oxide reacted with excess carbon and 4.37 L of CO₂ formed at 100°C and 1.50 atm,what is the identity of the metal?

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He,Cl₂,CH₄,and NH₃,each at 0°C and 1 atm pressure. -For which gas are the molecules diatomic?

Correct Answer
verified

Correct Answer
verified

The rate of effusion of an unknown gas was measured and found to be 11.9 mL/min.Under identical conditions,the rate of effusion of pure oxygen (O₂) gas is 14.0 mL/min.Based on this information,the identity of the unknown gas could be:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Three 1.00-L flasks at 25°C and 725 torr contain the gases CH₄ (flask A) ,CO₂ (flask B) ,and C₂H₆ (flask C) . -In which single flask do the molecules have the greatest mass,the greatest average velocity,and the highest kinetic energy?

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He,Cl₂,CH₄,and NH₃,each at 0°C and 1 atm pressure. -For which gas do the molecules have the smallest average kinetic energy?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Order the following in increasing rate of effusion: F₂,Cl₂,NO,NO₂,CH₄

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A mixture of KCl and KClO₃ weighing 1.34 grams was heated;the dry O₂ generated occupied 143 mL at STP.What percent of the original mixture was KClO₃,which decomposes as follows:

Correct Answer
verified

Correct Answer
verified

Four identical 1.0-L flasks contain the gases He,Cl₂,CH₄,and NH₃,each at 0°C and 1 atm pressure. -For which gas are the collisions elastic?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified