GAS PRESSURE

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?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-5

Which of these is under greater pressure?

• 
• 

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

The temperature of gas is held constant, while its volume is decreased. The pressure exerted by the gas on the wall of the container increases, because its molecules

• Strike the walls with higher velocities

• Strike the walls with more force

• Strike the walls more frequently

• Are in contact with the walls for a shorter time

If a balloon is cooled what will happen to the volume?

• Volume will increase

• Volume will decrease

• Volume will not change

Gases have...

• A definite shape and volume

• A definite shape but no definite volume

• No definite shape but a definite volume

• No definite shape or volume

Tags

NGSS.MS-PS3-4

Gas pressure is caused by

• Gas molecules heating up

• Gas molecules reacting with other gas molecules

• Gas molecules hitting the walls of a container

• Gas molecules hitting other gas molecules

What direction do the molecules go in the air?

• everywhere
• no where
• there are no molecules
• downward