5
QuizMultiple Choice

Gases

Question 5 • IA-Chemistry A Survey of Chemistry A

The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressures and temperatures. Which best describes this statement?

Answer
A
This is a limitation of the kinetic-molecular theory.
B
This is a postulate of the kinetic-molecular theory.
C
This describes ideal gas behavior using the kinetic-molecular theory.
D
This describes ideal gas behavior without the kinetic-molecular theory.

Explanation

The kinetic-molecular theory assumes gas particles have negligible volume and exert no intermolecular forces. At high pressures or low temperatures, particles get closer together and move more slowly, so those forces can matter. This is a situation where the theory no longer describes gas behavior accurately, making it a limitation of the kinetic-molecular theory.

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