Phase Changes A change from one state of matter (solid, liquid, gas) to another. Physical change...
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Transcript of Phase Changes A change from one state of matter (solid, liquid, gas) to another. Physical change...
Phase Changes
• A change from one state of matter (solid, liquid, gas) to another.
• Physical change because appearance is changed, not chemical make-up; reversible.
• Heat energy is either absorbed (molecules speed up) or released (molecules slow down)
• Ex. Melting: Ice to water; heat absorbed
Types of Phase Changes
Melting
• Phase change from a solid to a liquid
• Molecules speed up, move farther apart, and absorb heat energy
Freezing
• Phase Change from a liquid to a solid
• Molecule slow down, move closer together and release heat energy.
Evaporation
• Phase change from a liquid to a gas (occurs at the boiling point)
• Molecules speed up, move farther apart, and absorb heat energy.
Condensation
• Phase change from a gas to a liquid.
• Molecules slow down, move closer together and release heat energy.
Sublimation
• Phase change from a solid to a gas.
• Molecules speed up, move farther apart, and absorb heat energy.
Deposition
• Phase change from a gas to a solid.
• Molecules slow down, move closer together and release heat energy.
• Vapor in air turns directly into frost on a windshield