5
AssignmentMultiple Select

Periodic Trends

Question 5 • *26-27 CFISD TX-Chemistry A CR

Which scenarios contradict ideal gas characteristics, representing deviations from kinetic-molecular principles or exceptions to ideal gas behavior? Select 3 options.

Answer
A
a gas at very high temperatures, when gas particles are moving very quickly
B
a gas at very low volumes, when gas particles are very close together
C
a gas at very low temperatures, when gas particles have very little kinetic energy
D
a gas at very low pressures, when gas particles are very far apart
E
a gas with highly polar molecules that have very strong intermolecular forces

Explanation

Ideal-gas behavior is most likely to fail when particles are crowded or when intermolecular attractions matter. At very low volumes, particles are close together, so their own volume and interactions are no longer negligible (B). At very low temperatures, particles have less kinetic energy, so attractions can affect their motion more (C); highly polar molecules with strong intermolecular forces also depart from the ideal model (E). High temperatures and very low pressures generally make gases behave more ideally, so A and D are not exceptions.

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