Vocabulary
Energy that comes from the movement of particles in matter
Thermal Energy
All ______ is made of particles that are constantly moving.
Matter
What happens to the motion of particles when thermal energy increases?
A. They slow down
B. They speed up
C. They stop moving
D. They disappear
They speed up
Solid to Liquid
Melting
A physical change from one state of matter to another
Phase Change
When thermal energy ______, particles move faster and spread apart
Increases
During which phase change do particles lose thermal energy?
A. Melting
B. Boiling
C. Condensation
D. Evaporation
Condensation
Liquid to Solid
Boiling/Evaporating
Particles tightly packed and vibrating in place
Definite shape, definite volume
Solid
When thermal energy ______, particles move slower and come closer together
decreases
What causes matter to change from a solid to a liquid?
A. Decrease in thermal energy
B. Increase in thermal energy
C. Loss of particles
D. Pressure increase
Increase in thermal energy
Gas to liquid
Condensation
Particles close but moving past each other.
Definite Volume, No definite shape
Liquid
__________ occur when energy is absorbed or released.
Phase changes
When water boils, what happens to the spacing between particles?
A. They move closer together
B. They stay in the same position
C. They spread farther apart
D. They stop moving
C. They spread farther apart
Liquid to solid
Freezing
Particles far apart and moving freely.
No definite shape or volume.
Gas
Melting= ______ energy,
Freezing=______ energy,
Melting = gaining energy,
Freezing = losing energy.
Which statement best describes the relationship between temperature and particle motion?
A. Higher temperatures mean slower particle motion
B. Lower temperatures mean faster particle motion
C. Higher temperatures mean faster particle motion
D. Temperature does not affect particle motion
C. Higher temperatures mean faster particle motion
In which state of matter do particles have the most energy and move the fastest?
A. Solid
B. Liquid
C. Gas
C. Gas