5
lesson pretestMultiple Choice

Pretest

Question 5 • Chemistry

Which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior?

Answer
A
high pressure and medium temperatures
B
high pressure and low temperatures
C
low pressure and medium temperatures
D
low pressure and low temperatures

Explanation

The kinetic-molecular theory assumes gas particles have negligible volume and do not attract one another. At high pressure, particles are crowded so their own volume matters; at low temperatures, they move more slowly, so attractions matter more. Thus high pressure and low temperatures limit the theory’s usefulness, matching choice B.

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