Phases and Phase Changes

The phase of matter in which the atoms are moving the fastest is

• solid
• liquid
• gas

What best describes the motion of atoms in a solid? 

• vibrating slowly in place
• sliding past each other
• moving rapidly in all directions

Which phase of matter is represented by the atoms in this diagram? 

• solid
• liquid
• gas

Which phase of matter is represented by the atoms in this diagram? 

• solid
• liquid
• gas

The phase of matter with a definite shape and volume is a

• solid
• liquid
• gas

The phase of matter with a definite volume but indefinite shape is a

• solid
• liquid
• gas

Gases have a...

• definite shape and volume
• indefinite shape and volume
• definite shape and indefinite volume

Adding heat energy causes the atoms to...

• move slower & get closer together

• move faster & get farther apart

• get bigger

• get smaller

Removing heat energy (cooling) causes the atoms to

• speed up and move farther apart

• slow down & move closer together

• get larger

• get smaller

When molecules flow around each other, they are in this phase

• solid
• liquid
• gas
• plasma