Particle Theory pressure

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

If the temperature of a gas increases what happens to its pressure?

• decreases
• increases
• stays the same
• increases and decreases

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

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 large farce

• Strike the walls more frequently

• Are in contact with the walls for a shorter time

Tags

NGSS.MS-PS3-5

A sample of a gas in a cylinder is shown. If the temperature is kept constant and the piston moves down to decrease volume, the pressure increases because the gas particles...

• Expand

• Become smaller

• Lose velocity within the container

• Collide more often within the container

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

• Volume will increase

• Volume will decrease

• Volume will not change

When heat is added to a sample of gas sealed in a container, which of the following will most likely happen?

• The temperature of gas will increase because the gas molecules will move much more slowly.
• The temperature of gas will decrease because the gas molecules will move faster
• The temperature of gas will increase because the gas molecules will move faster. 
• Temperature of gas will decrease because the gas molecules will stop moving

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