CHAPTER 2: MATTER. CHANGES OF STATE When matter changes from one state to another, we call this a phase change Thermal energy is related to the microscopic.

CHAPTER 2: MATTER

CHANGES OF STATE

• When matter changes from one state to another, we call this a phase change

• Thermal energy is related to the microscopic random variations and motions of the particles of matter

Temperature and Changes of State

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• Melting: change from solid to liquid• Temperature: melting point

• Freezing: change from liquid to solid• Temperature: freezing point

Melting and Freezing

p. 402.17PHYSICAL SCIENCE

• Any process resulting in a solid or liquid substance changing directly to gas

• The rate of vaporization refers to how fast liquid water changes to a gas

• Vapor pressure

Vaporization and Condensation

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• Kinds of Vaporization• Boiling• Evaporation• Sublimation

Vaporization and Condensation

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• Condensation: vapor cools and changes to liquid

• Deposition: vapor becomes a solid

Vaporization and Condensation

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