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Ch. 12 - Liquids & Solids III. Changes of State (p. 372 - 382)

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Presentation on theme: "Ch. 12 - Liquids & Solids III. Changes of State (p. 372 - 382)"— Presentation transcript:

1 Ch. 12 - Liquids & Solids III. Changes of State (p. 372 - 382)

2 A. Phase Changes Evaporation Evaporation molecules at the surface gain enough energy to overcome IMF Volatility Volatility measure of evaporation rate depends on temp & IMF

3 A. Phase Changes Equilibrium Equilibrium trapped molecules reach a balance between evaporation & condensation

4 A. Phase Changes Vapor Pressure Vapor Pressure pressure of vapor above a liquid at equilibrium IMFv.p.tempv.p. depends on temp & IMF directly related to volatility p.478 temp v.p.

5 A. Phase Changes Boiling Point temp at which v.p. of liquid equals external pressure IMFb.p.P atm b.p. depends on P atm & IMF Normal B.P. - b.p. at 1 atm

6 Which has a higher m.p.? polar or nonpolar? covalent or ionic? A. Phase Changes Melting Point equal to freezing point polar ionic IMFm.p.

7 A. Phase Changes Sublimation solid gas v.p. of solid equals external pressure EX: dry ice, mothballs, solid air fresheners


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