According to the kinetic molecular theory, what is generally true about the particles in a gas?

• A. They move only when energy is added to the system.
• B. They are in constant, random motion.
• C. They are closely packed and vibrate in fixed positions.
• D. They experience strong attractive forces between each other.

Answer: (B)

Verified step by step guidance

1. Recall the main postulates of the kinetic molecular theory, which describes the behavior of gas particles.
2. Understand that according to this theory, gas particles are in constant motion, moving randomly in all directions.
3. Recognize that gas particles do not require additional energy to move; their motion is continuous and inherent at temperatures above absolute zero.
4. Note that gas particles are far apart compared to solids and liquids, so they are not closely packed and do not vibrate in fixed positions.
5. Acknowledge that the theory assumes negligible attractive forces between gas particles, allowing them to move independently.