Question

which of the following is not a part of the kinetic molecular theory? all particles are very small. all particles are in constant motion. all particles stay in fixed positions. all particles have an average kinetic energy that changes with temperature.

Explanation:

The kinetic molecular theory states that particles are very small, in constant motion, and their average kinetic energy is related to temperature. Particles in solids, liquids, and gases are in motion (even if restricted in solids), so "All particles stay in fixed positions" contradicts this theory.

Answer:

C. All particles stay in fixed positions.