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.

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Presentation transcript:

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

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