5
lesson pretestMultiple Choice

Pretest

Question 5 • Chemistry

Which postulate of the kinetic-molecular theory applies to the particles of a liquid?

Answer
A
They can be compressed, which causes a large change in volume.
B
They do not move freely but vibrate in a stationary position.
C
They have enough kinetic energy to easily slide by each other.
D
They have so much kinetic energy that their intermolecular forces are negligible.

Explanation

Liquid particles have enough kinetic energy to move around and slide past one another, while remaining close together because of intermolecular forces. So the statement that they can easily slide by each other applies to liquids. Choice A describes gas particles, while D describes particles in a solid.

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