4
lesson pretestMultiple Choice

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Question 4 • Chemistry

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

Explanation

The kinetic-molecular theory assumes gas particles are far apart and that intermolecular forces are negligible. At certain pressures and temperatures, particles can be close together and move slowly enough for those forces to matter, so the assumptions no longer hold well. This is a limitation of the kinetic-molecular theory.

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