Question 1

If a gas expands freely into a vacuum,

Accepted Answer

A)  the expansion is adiabatic, so the gas does work on its environment and its internal energy decreases. 
B)  the expansion is isothermal. 
C)  the expansion is occurs at constant pressure. 
D)  the expansion is adiabatic but no work is done, so the internal energy of the gas and its temperature both decrease. 
E)  the expansion is adiabatic but no work is done, so the internal energy of the gas and its temperature do not change. 
A)  the expansion is adiabatic, so the gas does work on its environment and its internal energy decreases. 
B)  the expansion is isothermal. 
C)  the expansion is occurs at constant pressure. 
D)  the expansion is adiabatic but no work is done, so the internal energy of the gas and its temperature both decrease. 
E)  the expansion is adiabatic but no work is done, so the internal energy of the gas and its temperature do not change.

Question 2

A monatomic gas can have internal energy consisting of:

Accepted Answer

A)  translational motion only 
B)  rotational motion only 
C)  oscillatory motion only 
D)  both translational and rotational motion 
E)  translational, rotational, and oscillatory motion, depending on temperature 
A)  translational motion only 
B)  rotational motion only 
C)  oscillatory motion only 
D)  both translational and rotational motion 
E)  translational, rotational, and oscillatory motion, depending on temperature

Question 3

An ideal diatomic gas has a molar specific heat at constant pressure, Cp, of:

Accepted Answer

A)  R 
B)  3R/2 
C)  5R/2 
D)  7R/2 
E)  9R/2 
A)  R 
B)  3R/2 
C)  5R/2 
D)  7R/2 
E)  9R/2

Question 4

In an adiabatic contraction,

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. 
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.

Question 5

An adiabatic 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 hyperbola 
D)  a circle 
E)  none of these 
A)  a horizontal line 
B)  a vertical line 
C)  a hyperbola 
D)  a circle 
E)  none of these

Question 6

Consider the ratios of the heat capacities $\gamma$ = Cp/Cv for the three types of ideal gases: monatomic, diatomic, and polyatomic.

Accepted Answer

A) $\gamma$is the greatest for monatomic gases 
B) $\gamma$ is the greatest for polyatomic gases 
C)  $\gamma$ is the same only for diatomic and polyatomic gases 
D)  $\gamma$ is the same only for monatomic and diatomic gases 
E)  $\gamma$ is the same for all three 
A) $\gamma$is the greatest for monatomic gases 
B) $\gamma$ is the greatest for polyatomic gases 
C)  $\gamma$ is the same only for diatomic and polyatomic gases 
D)  $\gamma$ is the same only for monatomic and diatomic gases 
E)  $\gamma$ is the same for all three

Question 7

A sample of an ideal gas is compressed by a piston from 10 m3 to 5 m3 and simultaneously cooled from 273 $\degree$C to 0 $\degree$C. As a result there is:

Accepted Answer

A)  an increase in pressure 
B)  a decrease in pressure 
C)  a decrease in density 
D)  no change in volume 
E)  an increase in density 
A)  an increase in pressure 
B)  a decrease in pressure 
C)  a decrease in density 
D)  no change in volume 
E)  an increase in density

Question 8

Avogadro's number is:

Accepted Answer

A)  6.02 x 1018 mol-1 
B)  6.02 x 1020 mol-1 
C)  6.02 x 1022 mol-1 
D)  6.02 x 1023 mol-1 
E)  6.02 x 1024 mol-1 
A)  6.02 x 1018 mol-1 
B)  6.02 x 1020 mol-1 
C)  6.02 x 1022 mol-1 
D)  6.02 x 1023 mol-1 
E)  6.02 x 1024 mol-1

Question 9

Platinum has a molar mass of 195 g/mol. If you have a ring that contains 2.3 g of platinum, how many moles does it contain?

Accepted Answer

A)  0.012 mol 
B)  85 mol 
C)  450 mol 
D)  7.2 x 1021 mol 
E)  1.4 x 1024 mol 
A)  0.012 mol 
B)  85 mol 
C)  450 mol 
D)  7.2 x 1021 mol 
E)  1.4 x 1024 mol

Question 10

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 pressure 
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 pressure

Question 11

The force on the walls of a vessel of a contained gas is due to:

Accepted Answer

A)  repulsive force between gas molecules 
B)  slight loss in average speed of a gas molecule after collision with wall 
C)  change in momentum of a gas molecule due to collision with wall 
D)  elastic collisions between gas molecules 
E)  inelastic collisions between gas molecules 
A)  repulsive force between gas molecules 
B)  slight loss in average speed of a gas molecule after collision with wall 
C)  change in momentum of a gas molecule due to collision with wall 
D)  elastic collisions between gas molecules 
E)  inelastic collisions between gas molecules

Question 12

Air enters a hot-air furnace at 7 $\degree$C and leaves at 77 $\degree$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 m3 
A)  0.80 m3 
B)  1.25 m3 
C)  1.9 m3 
D)  7.0 m3 
E)  11 m3

Question 13

A system consists of N gas molecules, each with mass m. Their rms speed is vrms. Their total translational kinetic energy is:

Accepted Answer

A)  (1/2)m(Nvrms)2 
B)  (1/2)N(mvrms)2 
C)  (1/2)mv2rms 
D)  (1/2)Nmv2rms 
E)  N[(1/2)mvrms]2 
A)  (1/2)m(Nvrms)2 
B)  (1/2)N(mvrms)2 
C)  (1/2)mv2rms 
D)  (1/2)Nmv2rms 
E)  N[(1/2)mvrms]2

Exam 19: The Kinetic Theory of Gases

If a gas expands freely into a vacuum,

A monatomic gas can have internal energy consisting of:

An ideal diatomic gas has a molar specific heat at constant pressure, Cp, of:

In an adiabatic contraction,

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

Consider the ratios of the heat capacities γ\gammaγ = Cp/Cv for the three types of ideal gases: monatomic, diatomic, and polyatomic.

A sample of an ideal gas is compressed by a piston from 10 m3 to 5 m3 and simultaneously cooled from 273 °\degree° C to 0 °\degree° C. As a result there is:

Avogadro's number is:

Platinum has a molar mass of 195 g/mol. If you have a ring that contains 2.3 g of platinum, how many moles does it contain?

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

The force on the walls of a vessel of a contained gas is due to:

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

A system consists of N gas molecules, each with mass m. Their rms speed is vrms. Their total translational kinetic energy is:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

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Temperature, Heat, and the First Law of Thermodynamics

Entropy and the Second Law of Thermodynamics

Electric Charge

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Circuits

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Nuclear Physics

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

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An ideal diatomic gas has a molar specific heat at constant pressure, C_p, of:

Consider the ratios of the heat capacities $\gamma$ = C_p/C_v for the three types of ideal gases: monatomic, diatomic, and polyatomic.

A sample of an ideal gas is compressed by a piston from 10 m³ to 5 m³ and simultaneously cooled from 273 $\degree$ C to 0 $\degree$ C. As a result there is:

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

A system consists of N gas molecules, each with mass m. Their rms speed is v_rms. Their total translational kinetic energy is: