Lesson 4 Motion of Particles

Brad is comparing a ceramic cup to the hot water inside the ceramic cup and the water vapor above the cup. What can she say about the motion of the particles in all of the substances?

• They do not move.

• They are all always moving.

• They all move past each other slowly.

• They all move very fast in all directions.

Courtney draws a model to show how the particles in a liquid appear. Which model (or models) above could be Courtney's drawing of particles in a liquid?

• model 1

• model 3

• model 1 and model 2

• model 1, model 2, and model 3

How can the motion of the particles in a gas best be described?

• particles that are far apart and do not move
• particles that are close together and vibrate in place
• particles that are close together and slide past each other
• particles that are far apart and move rapidly in all directions

Demetri has a certain mass of helium. He measures how the volume of the gas changes at 10-degree temperature intervals. He creates a bar graph of his results. Why does he observe the trend shown in the graph?

• The mass of the helium increases with temperature.
• The helium particles get bigger when they are heated.
• The helium expands as vibrations between the particles that are locked in place increase.
• The amount of space between the particles increases as the helium gains more energy.

Solid particles are...

• tightly packed.
• loosely bonded and flowing.
• free to fly in all directions.
• so hot that the electrons are removed from the nucleus.

Gas particles are...

• tightly packed.
• loosely bonded and flowing.
• free to fly in all directions.
• so hot that the electrons are removed from the nucleus.

Solid particles have the _________ energy.

• most
• middle amount of
• least

Solids 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

Liquid particles are...

• tightly packed
• loosely bonded and flowing
• free to fly in all directions
• so hot that the electrons are removed from the nucleus.

Particles move quickest

• solid
• liquid
• gas
• solid, liquid and gas