Phase Change

When a substance melts, the kinetic energy _____________.

• decreases
• stays the same
• increases
• decreases then increases

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

• solid
• liquid
• gas
• plasma

The molecules in this picture are in what phase?

• solid
• liquid
• gas
• plasma

If this substance had kinetic energy ADDED, it would be in what phase?

• solid
• liquid
• gas
• plasma

Sam had a solid and added energy to it. What did the molecules look like?

• The molecules moved in place.
• The molecules moved away from each other.
• The molecules didn't move.
• The molecules moved around each other.

What is the energy that an object has because it is moving?

• kinetic
• potential
• electric
• wind

What takes place when a liquid changes to a gas?

• condensation
• melting
• evaporation
• freezing

What is a group of atoms joined together called?

• an atom
• molecule
• matter
• compound

What takes place when a solid changes to a liquid?

• condensation
• melting
• evaporation
• freezing

What is the average kinetic energy of a substance called?

• volume
• temperature
• pressure
• movement