Brownian Motion and Gas Pressure

What is Brownian motion?

• The movement of water molecules in a beaker

• The movement of air molecules

• The movement of solid molecules

• The movement of smoke particles in air

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. He 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

Tags

NGSS.MS-PS1-4

Which of the following does NOT describe Brownian motion?

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Tags

NGSS.HS-PS1-5

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

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

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

Tags

NGSS.MS-PS1-4

Which of these is under greater pressure?

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• 

Which of these under greater pressure?

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• 

Which of these under greater pressure?

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• 

When gas particles bump into something, ...

• they cause pressure

• they cause density