Question 1

Ideal monatomic gas A is composed of molecules with mass m while ideal monatomic gas B is composed of molecules with mass 4m.The average molecular energies are the same if the ratio of the temperatures TA/TB is:

Accepted Answer

A)  1/4
B)  1/2
C)  1
D)  2
E)  4F) All of the above
G) A) and D)

Question 2

A real gas undergoes a process which can be represented as a curve on a p-V diagram.This curve is an isotherm if:

Accepted Answer

A)  the volume of the gas does not change
B)  the temperature of the gas does not change
C)  the pressure of the gas does not change
D)  the gas does no work on its environment
E)  the gas exchanges no heat with its environmentF) A) and E)
G) B) and D)

Question 3

The heat capacity at constant volume and the heat capacity at constant pressure have different values because:

Accepted Answer

A)  heat increases the internal energy at constant volume but not at constant pressure
B)  heat increases the internal energy at constant pressure but not at constant volume
C)  the system does work at constant volume but not at constant pressure
D)  the system does work at constant pressure but not at constant volume
E)  the system does more work at constant volume than at constant pressureF) A) and C)
G) C) and E)

Question 4

During a reversible adiabatic expansion of an ideal gas, which of the following is NOT true?

Accepted Answer

A)    = constant
B)  pV = nRT
C)    = constant
D)  W = - V pdV
E)  pV = constantF) A) and B)
G) B) and C)

Question 5

During a slow adiabatic expansion of a gas:

Accepted Answer

A)  the pressure remains constant
B)  energy is added as heat
C)  work is done on the gas
D)  no energy enters or leaves as heat
E)  the temperature is constantF) B) and D)
G) B) and C)

Question 6

In an adiabatic expansion,

Accepted Answer

A)  the temperature of the gas does not change.
B)  the gas does work on the environment, and the internal energy of the gas decreases.
C)  the environment does work on the gas, and the internal energy of the gas increases.
D)  the volume of the gas does not change.
E)  the pressure of the gas does not change.F) A) and E)
G) None of the above

Question 7

TV   γ\gammaγ   is constant for an ideal gas undergoing an adiabatic process, where  γ\gammaγ  is the ratio of heat capacities Cp/Cv.This is a direct consequence of:

Accepted Answer

A)  the zeroth law of thermodynamics alone
B)  the zeroth law and the ideal gas equation of state
C)  the first law of thermodynamics alone
D)  the ideal gas equation of state alone
E)  the first law and the equation of state F) A) and E)
G) C) and D)

Question 8

An isothermal process for an ideal gas is represented on a p-V diagram by:

Accepted Answer

A)  a horizontal line
B)  a vertical line
C)  a portion of an ellipse
D)  a portion of a parabola
E)  a hyperbolaF) A) and D)
G) C) and D)

Question 9

The diagram shows three isotherms for an ideal gas, with T3-T2 the same as T2-T1.It also shows five thermodynamic processes carried out on the gas.Rank the processes in order of the change in the internal energy of the gas, least to greatest. 3-T2 the same as T2-T1.It also shows five thermodynamic processes carried out on the gas.Rank the processes in order of the change in the internal energy of the gas, least to greatest.   A) I, II, III, IV, V B) V; then I, III and IV tied; then II C) V; I; then III, and IV tied; then II D) II; then I, III and IV tied; then V E) II; I; then III, IV, and V tied" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I, II, III, IV, V
B)  V; then I, III and IV tied; then II
C)  V; I; then III, and IV tied; then II
D)  II; then I, III and IV tied; then V
E)  II; I; then III, IV, and V tiedF) B) and E)
G) A) and E)

Question 10

In using the ideal gas law, the temperature T must be measured in:

Accepted Answer

A)  Celsius
B)  Kelvin
C)  Fahrenheit
D)  either Celsius or Kelvin
E)  any units as long as the correct values of k or R are usedF) B) and E)
G) A) and E)

Question 11

For a given change in temperature, the change in the internal energy of an ideal gas:

Accepted Answer

A)  also depends on the change in pressure
B)  also depends on the change in volume
C)  depends on whether the process is adiabatic or not
D)  depends on whether the process occurs at constant pressure or not
E)  can be calculated assuming the volume is constantF) A) and E)
G) D) and E)

Question 12

The energy absorbed as heat by an ideal gas for an isothermal process equals:

Accepted Answer

A)  the work done by the gas
B)  the work done on the gas
C)  the change in the internal energy of the gas
D)  the negative of the change in internal energy of the gas
E)  zero since the process is isothermalF) A) and B)
G) A) and C)

Question 13

Two ideal monatomic gases are in thermal equilibrium with each other.Gas A is composed of molecules with mass m while gas B is composed of molecules with mass 4m.The ratio of the average molecular speeds vA/vB is:

Accepted Answer

A)  1/4
B)  1/2
C)  1
D)  2
E)  4F) A) and E)
G) A) and B)

Question 14

The pressure of an ideal gas is doubled during a process in which the energy given up as heat by the gas equals the work done on the gas.As a result, the volume is:

Accepted Answer

A)  doubled
B)  halved
C)  unchanged
D)  need more information to answer
E)  nonsense, the process is impossibleF) B) and E)
G) A) and B)

Question 15

As the volume of an ideal gas is increased at constant pressure the average molecular speed:

Accepted Answer

A)  increases
B)  decreases
C)  increases at high temperature, decreases at low
D)  decreases at high temperature, increases at low
E)  stays the sameF) All of the above
G) B) and E)

Question 16

The pressure of an ideal gas of diatomic molecules is doubled by halving the volume.The ratio of the new internal energy to the old, both measured relative to the internal energy at 0 K, is:

Accepted Answer

A)  1/4
B)  1/2
C)  1
D)  2
E)  4F) D) and E)
G) B) and C)

Question 17

Oxygen (molar mass = 32 g) occupies a volume of 12 liters when its temperature is 20°C and its pressure is 1 atm.Using R = 0.082 liter.atm/mole.K, calculate the mass of the oxygen:

Accepted Answer

A)  6.4 g
B)  11 g
C)  16 g
D)  32 g
E)  64 gF) C) and D)
G) A) and B)

Question 18

Air enters a hot-air furnace at 7°C and leaves at 77°C.If the pressure does not change each entering cubic meter of air expands to:

Accepted Answer

A)  0.80 m3
B)  1.25 m3
C)  1.9 m3
D)  7.0 m3
E)  11 m3F) D) and E)
G) None of the above

Question 19

The specific heat of a polyatomic gas is greater than the specific heat of a monatomic gas because:

Accepted Answer

A)  the polyatomic gas does more positive work when energy is absorbed as heat
B)  the monatomic gas does more positive work when energy is absorbed as heat
C)  the energy absorbed by the polyatomic gas is split among more degrees of freedom
D)  the pressure is greater in the diatomic gas
E)  a monatomic gas cannot hold as much heatF) A) and C)
G) A) and B)

Question 20

If the temperature T of an ideal gas is increased at constant pressure the mean free path:

Accepted Answer

A)  decreases in proportion to 1/T
B)  decreases in proportion to 1/T2
C)  increases in proportion to T
D)  decreases in proportion to T2
E)  does not changeF) A) and D)
G) B) and C)

Exam 19: The Kinetic Theory of Gases

A real gas undergoes a process which can be represented as a curve on a p-V diagram.This curve is an isotherm if:

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The diagram shows three isotherms for an ideal gas, with T3-T2 the same as T2-T1.It also shows five thermodynamic processes carried out on the gas.Rank the processes in order of the change in the internal energy of the gas, least to greatest.

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TV γ\gammaγ is constant for an ideal gas undergoing an adiabatic process, where γ\gammaγ is the ratio of heat capacities Cp/Cv.This is a direct consequence of:

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For a given change in temperature, the change in the internal energy of an ideal gas:

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In using the ideal gas law, the temperature T must be measured in:

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As the volume of an ideal gas is increased at constant pressure the average molecular speed:

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In an adiabatic expansion,

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The pressure of an ideal gas of diatomic molecules is doubled by halving the volume.The ratio of the new internal energy to the old, both measured relative to the internal energy at 0 K, is:

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During a reversible adiabatic expansion of an ideal gas, which of the following is NOT true?

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The specific heat of a polyatomic gas is greater than the specific heat of a monatomic gas because:

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Oxygen (molar mass = 32 g) occupies a volume of 12 liters when its temperature is 20°C and its pressure is 1 atm.Using R = 0.082 liter.atm/mole.K, calculate the mass of the oxygen:

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Two ideal monatomic gases are in thermal equilibrium with each other.Gas A is composed of molecules with mass m while gas B is composed of molecules with mass 4m.The ratio of the average molecular speeds vA/vB is:

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Air enters a hot-air furnace at 7°C and leaves at 77°C.If the pressure does not change each entering cubic meter of air expands to:

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Ideal monatomic gas A is composed of molecules with mass m while ideal monatomic gas B is composed of molecules with mass 4m.The average molecular energies are the same if the ratio of the temperatures TA/TB is:

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The pressure of an ideal gas is doubled during a process in which the energy given up as heat by the gas equals the work done on the gas.As a result, the volume is:

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If the temperature T of an ideal gas is increased at constant pressure the mean free path:

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An isothermal process for an ideal gas is represented on a p-V diagram by:

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The energy absorbed as heat by an ideal gas for an isothermal process equals:

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The heat capacity at constant volume and the heat capacity at constant pressure have different values because:

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During a slow adiabatic expansion of a gas:

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The diagram shows three isotherms for an ideal gas, with T₃-T₂the same as T₂-T₁.It also shows five thermodynamic processes carried out on the gas.Rank the processes in order of the change in the internal energy of the gas, least to greatest.

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TV ^$\gamma$ is constant for an ideal gas undergoing an adiabatic process, where $\gamma$ is the ratio of heat capacities C_p/C_v.This is a direct consequence of:

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Two ideal monatomic gases are in thermal equilibrium with each other.Gas A is composed of molecules with mass m while gas B is composed of molecules with mass 4m.The ratio of the average molecular speeds v_A/v_B is:

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Ideal monatomic gas A is composed of molecules with mass m while ideal monatomic gas B is composed of molecules with mass 4m.The average molecular energies are the same if the ratio of the temperatures T_A/T_B is:

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