Latent Heat and Communicating Enthalpy

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Last updated 3:17 AM on 5/19/26
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4 Terms

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when a substance undergoes a phase change…

  • Energy is gained or lost by the system without a change in temperature.  

  • Energy change is due to reformation (breaking or forming) of intermolecular forces. 

  • The average kinetic energy of the particles of the system is not changing

<ul><li><p><span style="background-color: transparent;">Energy is gained or lost by the system <strong><u>without</u></strong> a change in temperature.&nbsp;&nbsp;</span></p></li><li><p><span style="background-color: transparent;">Energy change is due to reformation (breaking or forming) of intermolecular forces.&nbsp;</span></p></li><li><p><span style="background-color: transparent;">The average kinetic energy of the particles of the system is not changing</span></p></li></ul><p></p>
2
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Latent Heat

is the energy absorbed/released during a phase change (no temperature change)

<p> is the energy absorbed/released during a phase change (no temperature change)</p>
3
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Enthalpy of Fusion, ΔHfus

The amount of energy required to melt/freeze a given mass of a substance

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Enthalpy of Vaporization, ΔHvap

The amount of energy required to vaporize/condense a given mass of a substance