States of Matter and Brownian Motion

Pollen grains suspended in water exhibit Brownian motion. How does a particle undergoing Brownian motion move?

• In smooth curves

• Randomly

• Orderly with a pattern

• In straight lines with no change of direction

A student makes an observation using a microscope. She observed some particles which were moving in a zig-zag way. What particles could these NOT be?

• Smoke particles in air

• Dust particles in a room

• Pollen grains in water

• Molecules in a solid bar of steel

Which of the following does NOT describe Brownian motion?

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Light and fast moving particles can move heavier particles. Which one is a correct example of the light and the heavy particle?

• Light : air molecule, Heavy : water molecule

• Light : air molecule, Heavy : smoke particle

• Light : smoke particle, Heavy : air molecule

• Light : pollen grain , Heavy : water molecule

What evidence does Brownian motion provide about molecules of a gas or liquid?

• Molecules are close together

• Molecules are far apart

• Molecules move continously but randomly

• Molecules move continously and randomly

The average kinetic energy of the particles in a substance

• internal energy

• temperature

• heat

• thermodynamics

When a substance is heated, particles will

• Move further apart

• Get larger

• Move closer together

• Be unaffected

The process when a solid turns into a liquid

• Evaporation

• Sublimation

• Freezing

• Melting

The process when a gas turns into a liquid

• Condensation

• Sublimation

• Freezing

• Evaporation

The process when a liquid turns into a gas

• Evaporation

• Melting

• Condensation

• Deposition