Big Ideas about Phase Change

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abridgesmith

Notes about Phase Changes - evaporation, condensation, freezing and melting

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Condensation & Freezing Caused by cooling & contracting

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Notes 2: Phase Change • Phase change is a change from one state of matter (solid, liquid, gas) to another. • Phase changes are physical changes because it only affects physical appearance, not chemical make-up and its reversible • Water exists on our planet in three states: Ice, water, and water vapor • Water is different from other substances because it is less dense as a solid than liquid • When temperature changes, molecules speed up/slow down resulting in a change in the average kinetic energy of molecules. • During a phase change, heat energy is either absorbed or released. Heat energy is released as molecules move closer together. Heat energy is absorbed as molecules move farther apart. • During phase changes, temperature does not change. Molecules move closer together or farther apart, resulting in a change in the potential energy of the molecules. • Types of phase changes: Melting, freezing, vaporization, condensation, sublimation, deposition • Melting - Phase change from a solid to a liquid • Freezing- Phase Change from a liquid to a solid • Vaporization - Phase change from a solid or liquid to gas. It occurs at the boiling point of matter or sublimation process. (Water - 100° C, Table salt - 1413° C, Diamond - 4200° C) • Evaporation-type of vaporization in which a liquid turns to a gas on the surface of a liquid (occurs at all temperatures). • Evaporation- a Cooling Process. As water in the perspiration evaporates from your skin it absorbs and carries away heat energy from your body. • Condensation - Phase change from a gas to a liquid. • Water vapor in surrounding air loses heat energy when it comes in contact with the cold glass. Water vapor condenses and becomes liquid drops of water. • Sublimation - Phase change from a solid to a gas. • Deposition - Phase change from a gas to a solid. • Boiling Point - The temperature at which a liquid changes into a gas. 212 F or 100 C • Melting Point - The temperature at which a solid changes into a liquid. 32 F or 0 C • Freezing point - The temperature at which a liquid changes into a solid. 32 F or 0 C • Freezing point and melting point of a substance are the same temperature.

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