Lec 2 - Lec 2 9/6/07 Missed beginning I. Graph in notes...

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Lec 2 9/6/07 Missed beginning I. Graph in notes – heating curve of H20 @ 1atm a. Heat is given at a const rate b. Phase transitions and phase equilib depicted in graph II. Terms a. Supercooling – temp below 0C but no lattice yet, so still liq. When form lattice, go back to 0C b. Superheating – “” bubbles not lattice c. Sublimation- solid gas d. Critical temp – the higest temp at which a liquid and vapor can coexist in EQ as physically distinct states of matter. ALSO the highest temp at which a gas can be condensed into a liquid solely by increasing the P of the gas e. ∆H sub = ∆H fus + ∆ Vap f. enthalpy (heat) of fusion – the quantity of heat required to melt a given amount of solid i. pos is endothermic ii. neg is exo III. Examples in NB a. q=ms∆T i. equation to calc energy used in temp change b. q=n∆H i. energy in phase change IV. Phase Diag in NB V. Effects of phases on melting pt in NB a. Water ONLY: P up, MP down b. ALL OTHERS: P up, MP up VI. Intermolecular Forces
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Lec 2 - Lec 2 9/6/07 Missed beginning I. Graph in notes...

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