Thermodynamics 1

Any change of temperature is due to work being done on or by the gas.

• Adiabatic

• Isovolumetric

• Isothermal

• isobaric

No ΔU.

•  Adiabatic

• Isovolumetric

• Isothermal

• isobaric

W = 0

• Adiabatic

• Isovolumetric

•  Isothermal

Answer explanation

W = 0 because ΔV =0: isovolumetric.

No work is done on or by the gas.

• Adiabatic

•  Isovolumetric

• Isothermal

Answer explanation

No work, means W = 0 because ΔV = 0.

ΔU = 0

• Adiabatic

•  Isovolumetric

• Isothermal

Answer explanation

Any change of temperature is due to a change of internal energy. So if ΔU = 0, then ΔT = 0: isothermal. Remember: heat does not equal temperature!

Q = W

• Adiabatic

•  Isovolumetric

• Isothermal

Answer explanation

Since ΔU = Q – W, if Q = W, then ΔU = 0, which means there is no change of temperature.

Only work is done on or by the gas.

• Adiabatic

•  Isovolumetric

•  Isothermal

Answer explanation

There is W, but Q = 0: adiabatic.

ΔU = -W

• Adiabatic

• Isovolumetric

• Isothermal

Answer explanation

In an adiabatic process ΔQ = 0, so ΔU = -W.

Generally happens very quickly.

• adiabatic

• isothermal

• isovolumetric

Answer explanation

When it happens very quickly there isn't enough time for heat to transfer, so Q = 0: adiabatic.

Tags

NGSS.HS-PS1-5

Any change of temperature is only because heat is added or removed.

• adiabatic

• isothermal

• isovolumetric

Answer explanation

A change of temperature (ΔT) means there is a change of internal energy (ΔU). If this ΔT is only due to Q, then W must equal 0. W = 0 when ΔV = 0: isovolumetric.

Tags

NGSS.HS-PS3-4