Phase Diagrams Introduction (Pre-AP Chem)

Multiple Select

What phases are shown in a phase diagram?

(Select ALL that apply)

• plasma

• solid

• liquid

• gas

• density

Dropdown

In a phase diagram,

Select answer

is shown along the horizontal axis while ​

Select answer

is shown along the vertical axis.

Hotspot

Which region of the phase diagram would you find solid water?

Hotspot

Which region of the phase diagram would you find liquid water?

Hotspot

Which region of the phase diagram would you find water vapor?

Match

Match each phase change name to the phases that are transitioned between.

• melting

• boiling

• freezing

• sublimating

• condensing

solid --> liquid

liquid --> gas

liquid --> solid

solid --> gas

gas --> liquid

• solid --> liquid

• liquid --> gas

• liquid --> solid

• solid --> gas

• gas --> liquid

Hotspot

In the phase digram of carbon dioxide (CO₂) where does melting occur?

Hotspot

In the phase digram of carbon dioxide (CO₂) where does boiling occur?

Hotspot

In the phase digram of carbon dioxide (CO₂) where does freezing occur?

Hotspot

In the phase digram of carbon dioxide (CO₂) where does sublimation occur?

Hotspot

In the phase digram of carbon dioxide (CO₂) where does condensing occur?

Fill in the Blanks

Fill in the Blanks

Multiple Choice

What happens to the atmospheric pressure as you go up in altitude/elevation?

• increases

• decreases

• stays the same

Reorder

Reorder the following from highest to lowest atmospheric pressure.

• the beach

• top of a small mountain

• top of a tall mountain

• cruising altitude for an airplane

• a satellite orbiting earth

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

What happens to the freezing/melting temperature of water as you go from Las Vegas to the top of Mt. Charleston?

• Increases

• Decreases

• Remains the same

Multiple Choice

What happens to the boiling/condensing temperature of water as you go from Las Vegas to the top of Mt. Charleston?

• Increases

• Decreases

• Remains the same

Multiple Choice

If you wanted water to behave like dry ice and go from solid to gas without becoming a liquid, what would you have to do to the pressure?

• Increase pressure

• Decrease pressure

Multiple Choice

Do all phase diagrams look the same?

• yes

• no

• maybe

Multiple Choice

How cold is dry ice?

(Hint: what is the sublimation temperature of CO₂ at 101 kPa?)

• -78.5°C

• -56.7°C

• 31°C

Multiple Choice

How high does the pressure have to be for CO₂ to melt?

(Hint: what is the lowest pressure at which liquid CO₂ is possible?)

• 101 kPa

• 517 kPa

• 7,387 kPa

Multiple Choice

Based on the phase diagrams, which particles do you think are more strongly attracted to one another?

• water

• carbon dioxide