If Region AB is a liquid, identify BC and C to the end.

a

b

freezing

melting

solid

gas

condensing

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

This cooling curve shows the freezing of a substance. The starting phase at AB is ​ (a)   . Region BC shows​ (b)   . From C to the end, the substance is ​ (c)   . The melting point of this substance is​ (d)   °C

• a liquid

• freezing

• a solid

• a gas

• condensing

• melting

• 150

• 200

• 110

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

NGSS.MS-PS3-4

Which segment of the graph represents a time when both the solid and liquid phases are present?

• AB

• BC

• DE

• EF

Tags

NGSS.MS-PS1-4

Which segment of the graph represents a time when both the liquid and gas phases are present?

• AB

• BC

• DE

• EF

Tags

NGSS.MS-PS1-4

Which segment of the graph represents an increase in average kinetic energy?

• AB and BC

• BC and DE

• DE and EF

• AB and CD

Tags

NGSS.MS-PS3-1

Which states of matter are present between line segment BC?

• Solid and Liquid

• Solid and Gas

• Liquid and Gas

• Solid only

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which states of matter are present between line segment DE?

• Solid and Liquid

• Solid and Gas

• Liquid and Gas

• Solid only

Tags

NGSS.MS-PS1-4

This curve indicates what about the heat energy?

• Heat energy is being added or absorbed

• Heat energy is being released

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the melting point of the substance?

• -60 ^oC

• 60 ^oC

• - 100 ^oC

• 100 ^oC

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the significance of the flat sections in a heating curve?

• They indicate a change in temperature.

• They represent a phase change where temperature remains constant.

• They show the substance is cooling down.

• They indicate the substance is in a gaseous state.

Tags

NGSS.MS-PS1-4