Particle Motion in Liquids

Steps:

• Recall kinetic molecular theory: particles in matter are in constant motion, with speed and pattern varying by state.
• Identify liquid state: particles are close but not fixed, allowing sliding past each other.
• Compare options to liquid properties: rule out fixed or uniform motion.
• Select option matching random diffusion and flow in liquids.

Why C is correct:

• Kinetic theory defines liquid particles as moving randomly in all directions, enabling fluidity and diffusion without fixed positions.

Why the others are wrong:

• A: Speeds vary due to collisions and energy distribution, not uniform.
• B: Particles are not stationary; they have kinetic energy causing motion.
• D: Vibration about fixed points describes solids, not liquids.

Final answer: C