Latent Heat and Phase Changes

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Presentation transcript:

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 A particular temperature that a substance boils. Water = 212F and 100C

Freezing When a liquid changes phases to a solid.

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

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

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

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

Latent Heat Two types of latent heat Heat of fusion Heat of vaporization

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

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

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)