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Phase Changes

Phase Changes. Review: 3 Phases of Matter. Solid Liquid Gas. What is a 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.

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Phase Changes

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  1. Phase Changes

  2. Review: 3 Phases of Matter • Solid • Liquid • Gas

  3. What is a 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. - Reversible

  4. What happens during a phase change? • During a phase change, heat energy is either absorbed or released. • Heat energy is released as molecules slow down and move closer together. • Heat energy is absorbed as molecules speed up and expand.

  5. Types of Phase Changes • Types of Phase Changes

  6. Melting • Phase change from a solid to a liquid • Molecules speed up, move farther apart, and absorb heat energy

  7. Freezing • Phase Change from a liquid to a solid • Molecule slow down, move closer together and release heat energy.

  8. Vaporization (Boiling) • Phase change from a liquid to gas. It occurs at the boiling point of matter. • Molecules speed up, move farther apart, and absorb heat energy.

  9. Evaporation • Phase change from a liquid to a gas on the surface of a liquid (occurs at all temperatures). • Molecules speed up, move farther apart, and absorb heat energy.

  10. Condensation • Phase change from a gas to a liquid. • Molecule slow down, move closer together and release heat energy.

  11. Sublimation • Phase change from a solid to a gas. • Molecules speed up, move farther apart, and absorb heat energy.

  12. Deposition • Phase change from a gas to a solid. • Molecules slow down, move closer together and release heat energy.

  13. Graphing a Phase Change

  14. Melting & Boiling Points • Melting Point: The temperature at which a solid changes into a liquid. • Boiling Point: The temperature at which a liquid changes into a gas. • What is a Freezing point? Compare the freezing and melting points of water.

  15. Summary

  16. Why is there no change in temperature during a phase change? Define melting and boiling points. What is the melting point and boiling point of water? At what temperature does water freeze and become a solid? Graphing a Phase Change

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