Question 1

What is the average kinetic energy of an ideal gas molecule at 569°C? (The Boltzmann constant is
1)38 × 10-23 J/K.)

Accepted Answer

A)  1.74 × 10-20 J 
B)  5.81 × 10-21 J 
C)  1.18 × 10-17 J 
D)  3.93 × 10-19 J 
A)  1.74 × 10-20 J 
B)  5.81 × 10-21 J 
C)  1.18 × 10-17 J 
D)  3.93 × 10-19 J

Question 2

At 50.0°C,the average translational kinetic energy of a gas molecule is K.If the temperature is now increased to 100.0°C,the average translational kinetic energy of a molecule will be closest to

Accepted Answer

A)  1.07K. 
B)  1.15K. 
C)  1.41K. 
D)  2.00K. 
E)  4.00K. 
A)  1.07K. 
B)  1.15K. 
C)  1.41K. 
D)  2.00K. 
E)  4.00K.

Question 3

The root-mean-square speed (thermal speed)of the molecules of a gas is 200 m/s at a temperature 23.0°C. What is the mass of the individual molecules? The Boltzmann constant is 1.38 × 10-23 J/K.

Accepted Answer

A)  2.13 × 10-25 kg 
B)  2.45 × 10-25 kg 
C)  5.66 × 10-25 kg 
D)  1.78 × 10-25 kg 
E)  3.11 × 10-25 kg 
A)  2.13 × 10-25 kg 
B)  2.45 × 10-25 kg 
C)  5.66 × 10-25 kg 
D)  1.78 × 10-25 kg 
E)  3.11 × 10-25 kg

Question 4

Dust particles are pulverized rock,which has density 2500 kg/m3.They are approximately spheres
20 μm in diameter.Treating dust as an ideal gas,what is the root-mean-square speed (thermal speed)of a dust particle at 400°C? (The Boltzmann constant is 1.38 × 10-23 J/K.)

Accepted Answer

A)  5.2 × 10-5 m/s 
B)  1.7 × 10-5 m/s 
C)  3.0 × 10-5 m/s 
D)  7.3 × 10-5 m/s 
A)  5.2 × 10-5 m/s 
B)  1.7 × 10-5 m/s 
C)  3.0 × 10-5 m/s 
D)  7.3 × 10-5 m/s

Question 5

A bag of potato chips contains 2.00 L of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0°C. What will be the volume of the air in the bag if you take it with you,still sealed,to the mountains where the temperature is 7.00°C and atmospheric pressure is 70.0 kPa? Assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.
(1 atm = 1.01 × 105 Pa)

Accepted Answer

A)  4.13 L 
B)  1.01 L 
C)  1.38 L 
D)  2.76 L 
A)  4.13 L 
B)  1.01 L 
C)  1.38 L 
D)  2.76 L

Question 6

When an ideal gas increases in volume at constant pressure,the average kinetic energy of the gas molecules

Accepted Answer

A)  increases. 
B)  decreases. 
C)  does not change. 
D)  may either increase or decrease, depending on whether or not the process is carried out adiabatically. 
E)  may or may not change, but insufficient information is given to make such a determination. 
A)  increases. 
B)  decreases. 
C)  does not change. 
D)  may either increase or decrease, depending on whether or not the process is carried out adiabatically. 
E)  may or may not change, but insufficient information is given to make such a determination.

Question 7

A sample of an ideal gas is slowly compressed to one-half its original volume with no change in pressure.If the original root-mean-square speed (thermal speed)of the gas molecules was V,the new speed is

Accepted Answer

A)  V. 
B)  2V. 
C)    V. 
D)  V/2. 
E)  V/   
A)  V. 
B)  2V. 
C)    V. 
D)  V/2. 
E)  V/

Exam 19: Entropy

What is the average kinetic energy of an ideal gas molecule at 569°C? (The Boltzmann constant is 1)38 × 10-23 J/K.)

At 50.0°C,the average translational kinetic energy of a gas molecule is K.If the temperature is now increased to 100.0°C,the average translational kinetic energy of a molecule will be closest to

The root-mean-square speed (thermal speed)of the molecules of a gas is 200 m/s at a temperature 23.0°C. What is the mass of the individual molecules? The Boltzmann constant is 1.38 × 10-23 J/K.

Dust particles are pulverized rock,which has density 2500 kg/m3.They are approximately spheres 20 μm in diameter.Treating dust as an ideal gas,what is the root-mean-square speed (thermal speed)of a dust particle at 400°C? (The Boltzmann constant is 1.38 × 10-23 J/K.)

When an ideal gas increases in volume at constant pressure,the average kinetic energy of the gas molecules

A sample of an ideal gas is slowly compressed to one-half its original volume with no change in pressure.If the original root-mean-square speed (thermal speed)of the gas molecules was V,the new speed is

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What is the average kinetic energy of an ideal gas molecule at 569°C? (The Boltzmann constant is 1)38 × 10^-23 J/K.)

The root-mean-square speed (thermal speed)of the molecules of a gas is 200 m/s at a temperature 23.0°C. What is the mass of the individual molecules? The Boltzmann constant is 1.38 × 10^-23 J/K.

Dust particles are pulverized rock,which has density 2500 kg/m³.They are approximately spheres 20 μm in diameter.Treating dust as an ideal gas,what is the root-mean-square speed (thermal speed)of a dust particle at 400°C? (The Boltzmann constant is 1.38 × 10^-23 J/K.)