Particle Motion

What happens to particles when heat is removed from them?

• They speed up and spread out

• They slow down and get closer together

• They stop moving

• They move closer together and speed up

Tags

NGSS.MS-PS1-4

What phase of matter is shown in the diagram? (The particles are far apart and have lots of energy.)

• solid

• liquid

• gas

• phase change

Tags

NGSS.MS-PS1-4

What happens to the particles of matter when a substance freezes?

• particles speed up and move closer

• particles slow down and move apart

• particles slow down and move closer

• particles speed up and move apart

Tags

NGSS.MS-PS1-4

The speed of the molecules determines the _____.

• volume

• density

• pressure

• temperature

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

Which of the following assumption(s) of kinetic molecular theory explain why gases have the ability to diffuse?

• Gases contain large numbers of tiny particles which are far apart. from each other.

• Collisions of particles with each other or the walls of the container are elastic.

• Gas particles are in constant, rapid, random motion.

• There are no attractive forces between gas particles.

• The temperature of a gas depends on the average kinetic energy of the particles.

Attractive forces are too weak to hold the particles of a gas in a rigid structure, therefore a gas has the ability to flow (fluidity).

• True

• False

Tags

NGSS.MS-PS1-4

Why do liquids have the ability to evaporate?

• Because there are no attractive forces between particles.

• Because the particles are relatively close together.

• Because the particles can slide past one another.

• Because there are large distances between particles

• Because some particles have enough energy to escape into the gas state.

Tags

NGSS.MS-PS1-4

Which state of matter has molecules that slide past each other but stay close together? They do not form a regular pattern.

• solid

• liquid

• gas

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the primary factor that determines the speed of particle motion in a gas?

• Temperature

• Pressure

• Volume

• Density

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

Which of the following best describes the motion of particles in a solid?

• Particles move freely and rapidly

• Particles vibrate in fixed positions

• Particles slide past each other

• Particles move randomly and independently