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Latent Heat and Phase Changes

Latent Heat and Phase Changes. 3 Phases of Matter. Solid, Liquid, and Gas Water can transfer from one phase to the next if you simply add or remove energy (heat). Boiling. Boiling is when a liquid is changing phase to a gas (vaporization). Addition of Heat. Boiling Point.

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Latent Heat and Phase Changes

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  1. Latent Heat and Phase Changes

  2. 3 Phases of Matter • Solid, Liquid, and Gas • Water can transfer from one phase to the next if you simply add or remove energy (heat)

  3. Boiling • Boiling is when a liquid is changing phase to a gas (vaporization). • Addition of Heat

  4. Boiling Point • A particular temperature that a substance boils. • Water = 212F and 100C

  5. Freezing • When a liquid changes phases to a solid.

  6. Freezing Point • A temperature at which a substance Freezes Water = 32F and 0C

  7. Melting Point • Temperature at which a substance Melts from Solid  Liquid • Ice = 32F and 0C

  8. Latent Heat during Phase change • The energy used to change the phase of the material.

  9. There is no temperature change on graph yet, heat is put into the material. The heat is absorbed by molecules to change phase. Where does the heat go?

  10. Latent Heat • Two types of latent heat • Heat of fusion • Heat of vaporization

  11. Heat of Fusion • Is the heat required to change a solid into a liquid. • Melting

  12. Heat of Vaporization • Heat used to change a liquid to a gas. • Evaporation or boiling

  13. Latent Heat (ESRT pg. 1) • Latent Heat is gained (absorbed) during melting (334 Joules/gram) • Latent Heat is released during freezing (334 Joules/gram) • Latent Heat is gained (absorbed) during vaporization (2260 Joules/gram) • Latent Heat is released during condensation (2260 Joules/gram)

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