Question

which statement about particle motion in gases is correct?
particles move in fixed positions.
particles have very limited movement.
particles move rapidly in all directions.
particles dont move at all.

Explanation:

To determine the correct statement about particle motion in gases, we analyze the properties of gas particles:

• "Particles move in fixed positions" describes solids (particles vibrate in fixed spots), so this is incorrect.
• "Particles have very limited movement" is true for liquids (particles slide past each other with some restriction), not gases, so this is incorrect.
• "Particles move rapidly in all directions" matches the kinetic theory of gases, where gas particles have high kinetic energy, move freely, and rapidly in random directions (due to weak intermolecular forces and large spaces between them).
• "Particles don't move at all" is false, as all particles have some motion (even in solids, they vibrate).

Answer:

C. Particles move rapidly in all directions.