Phase Changes

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1

Slide 1

Phase Changes

Slide 2

CA Standards

Students know energy is released when a material condenses or freezes and is absorbed when a material evaporates or melts.

Slide 3

Water phase changes

Temperature remains

during a phase change.

constant

Slide 4

Effect of Pressure on Boiling Point

Slide 5

Phase Diagram

Represents phases as a function of temperature and pressure.

Critical temperature: temperature above which the vapor can not be liquefied.

Critical pressure: pressure required to liquefy AT the critical temperature.

Critical point: critical temperature and pressure (for water, Tc = 374°C and 218 atm).

Slide 6

Phase changes by Name

Slide 7

Water

Slide 8

Carbon dioxide

Phase Diagram for Carbon

dioxide

Slide 9

Carbon

Phase Diagram for Carbon

Slide 10

Phase Diagram for Sulfur