Question

which of the following are part of kinetic-molecular theory? check all that apply.
the particles in a solid do not move.
the particles in a liquid are moving past one another constantly.
the particles in gas move freely in all directions.
the particles in a solid vibrate in a fixed position.
the particles in a solid are far apart.
the particles in a gas have few attractions between them.
the particles in all states of matter are always moving.
retry

Explanation:

1. Analyze each statement based on kinetic - molecular theory:

• "The particles in a solid do not move": According to kinetic - molecular theory, particles in a solid vibrate in fixed positions, so they do move (vibrate). So this is incorrect.
• "The particles in a liquid are moving past one another constantly": In liquids, particles have enough energy to slide past each other, which is part of kinetic - molecular theory. So this is correct.
• "The particles in gas move freely in all directions": Gases have particles with high kinetic energy that move freely in all directions, which is part of the theory. So this is correct.
• "The particles in a solid vibrate in a fixed position": This is a key part of kinetic - molecular theory for solids. So this is correct.
• "The particles in a solid are far apart": In solids, particles are closely packed, not far apart. So this is incorrect.
• "The particles in a gas have few attractions between them": Gas particles have very weak intermolecular attractions, which is part of the theory. So this is correct.
• "The particles in all states of matter are always moving": Kinetic - molecular theory states that all matter is composed of particles in constant motion (vibrational, translational, etc.). So this is correct.

Answer:

• The particles in a liquid are moving past one another constantly.
• The particles in gas move freely in all directions.
• The particles in a solid vibrate in a fixed position.
• The particles in a gas have few attractions between them.
• The particles in all states of matter are always moving.