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Unformatted text preview: 1 Liquids, Solids and Liquids, Solids and Intermolecular Forces Intermolecular Forces Chapter 11 Chapter 11 Part B Part B Sublimation and Deposition Sublimation and Deposition molecules in the solid have thermal energy that allows them to vibrate surface molecules with sufficient energy may break free from the surface and become a gas this process is called sublimation the capturing of vapor molecules into a solid is called deposition the solid and vapor phases exist in dynamic equilibrium in a closed container at temperatures below the melting point therefore, molecular solids have a vapor pressure solid gas sublimation deposition 2 Melting = Fusion Melting = Fusion as a solid is heated, its temperature rises and the molecules vibrate more vigorously once the temperature reaches the melting point, the molecules have sufficient energy to overcome some of the attractions that hold them in position and the solid melts (or fuses ). Melting is an endothermic process . the opposite of melting is freezing as you heat a solid, its temperature increases linearly until it reaches the melting point q = mass x C s x DT once the temperature reaches the melting point, all the added heat goes into melting the solid the temperature stays constant...
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This note was uploaded on 03/06/2010 for the course CHEM 102a taught by Professor Hanusa during the Fall '06 term at Vanderbilt.
- Fall '06