8
QuizMultiple Choice

Gases

Question 8 • IA-Chemistry A Survey of Chemistry A

Which is an example of the kinetic-molecular theory not holding true for a gas?

Answer
A
The average kinetic energy of particles depends only on the temperature.
B
The particles in a gas travel in straight lines in a continuous, random motion.
C
The attraction between particles causes a gas to condense at low temperatures.
D
The particles in a gas make up a small portion of the total volume of the gas.

Explanation

The kinetic-molecular theory assumes gas particles have negligible attractions and move independently, so those attractions do not explain their motion in the idealized model. In real gases, attractions become important at low temperatures and can cause the gas to condense into a liquid. Therefore, “The attraction between particles causes a gas to condense at low temperatures” is the example of the theory not holding true.

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