8th Grade Final

What is the phase change of a solid to a liquid?

• freezing
• melting
• boiling
• condensation

All changes in the state of matter of a substance requires

• vibration
• water
• permission
• energy

What happens to particles when they are heated?

• They speed up and spread out
• They slow down and compress
• They stop moving
• They move closer together and speed up

Between which two points is the solid cooling?

• A <---- B

• B <----> C

• C <---- D

• D <----> E

• E <---- F

The graph shows a cooling curve for an unknown substance.  What is happening during segment DE?

• boiling
• condensation
• freezing
• melting

What is happening to the particles in the substance between points A and B?

• Melting

• Freezing

• Speeding Up

• Slowing Down

How would you describe the way molecules move when the molecules are liquid?

• the molecules are moving in place.

• the molecules are moving around each other.

• the molecules are moving away from each other.

• the molecules are not moving

How would you describe the way molecules move when the molecules are gas?

• the molecules are moving in place.

• the molecules are moving around each other.

• the molecules are moving away from each other.

• the molecules are not moving

How would you describe the way molecules move when the molecules are solid?

• the molecules are moving in place.

• the molecules are moving around each other.

• the molecules are moving away from each other.

• the molecules are not moving

What happens to molecules when energy transfers out of a substance?

• The substance's molecules will move faster.

• The substances's molecules will move slower.

• The substance's molecules will continue to move at the same speed.

• The substance's molecules will stop moving.