Worksheet: Ideal Gases

In this worksheet, we will practice describing the properties of ideal gases in which particles have zero volume and collide elastically.


Which of the following statements is incorrect?

  • AAn isothermal expansion of an ideal gas always gives Ξ”π‘ˆ>0 and Δ𝑆=0.
  • BThe entropy of a system always increases with an increase in temperature under either constant-volume or constant-pressure conditions.
  • CIn cyclic thermodynamic processes, it is always true that the net changes in internal energy (Ξ”π‘ˆ), entropy (Δ𝑆), and enthalpy (Δ𝐻) of a system are zero (i.e., Ξ”π‘ˆ=Δ𝑆=Δ𝐻=0netnetnet).
  • DIn reversible adiabatic processes, it is always true that Δ𝑆=0 and Ξ”π‘ˆ=𝑀 (work).


At fixed temperature and pressure, which of the following quantities is not the same for samples of He()g and Ne()g?

  • AMolar heat capacity
  • BAverage speed of atoms
  • CAverage kinetic energy of atoms
  • DMolar concentration
  • ECompressibility


If gas X behaves like an ideal gas, which of the following accurately depicts the relationship between its pressure, 𝑃, and compressibility factor, 𝑍?

  • A
  • B
  • C
  • D


Which of the following graphs incorrectly depicts the relationship between two properties of an ideal gas?

  • A
  • B
  • C
  • D
  • E

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