Big Ideas about Phase Change

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There are three states of matter - solid, liquid, and gas - and four types of phase changes: melting, freezing, evaporation, and condensation. Phase changes occur when heat is added or removed, causing particles to gain or lose kinetic energy and change their movement and spacing. Melting and evaporation are caused by heat increasing particle energy and movement, while condensation and freezing are caused by cooling, which decreases particle energy and causes them to slow down and contract.

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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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