Unit 1: Review 2 Classification of Matter

What phase change is taking place as energy is

lost at segment BA?

• melting

• freezing

• sublimation

• condensation

Tags

NGSS.MS-PS1-4

What is occurring at the plateaus or flat sections

on the heating curve?

• The temperature is decreasing.

• The temperature remains unchanged.

• The temperature is increasing.

• The temperature varies unpredictably.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Directions: The diagram shows a heating curve for an unknown substance. Use the diagram to answer any

questions that follow.

What is the boiling point of the substance?

• -25°C

• 18°C

• 290°C

• 350°C

Tags

NGSS.MS-PS1-4

Directions: Use the heating curve below to answer any questions that follow.

Between which two points on the heating curve is

the substance melting?

• AB

• BC

• DE

• EF

Tags

NGSS.MS-PS1-4

A science teacher heated liquid ethanol for an

experiment. When he turned up the temperature,

the ethanol quickly disappeared, and a strong

aroma filled the room. What happened to the

ethanol?

• Heating the particles in the ethanol caused them

  to react and bond with gases in the air, which

  carried the liquid ethanol particles around the

  room.

• Heating the particles in the ethanol removed

  some of their mass, decreasing their density and

  causing them to flow across the room as a

  liquid.

• Heating the particles in the ethanol energized

  them, and they began to collide within the

  container until they escaped to fill the room as a

  gas.

• Heating the particles in the ethanol removed

  some of their energy, and they began to slow

  down and

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4