LECTURE6 - 1 Midterm 1 Monday Apr 18 th In class....

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Unformatted text preview: 1 Midterm 1 Monday Apr 18 th In class. Thermochemistry (chap 11) Liquids and Solids (chap 12) Solutions (chap 13) Sample exams on website guide only A B C Heating Curve A B C Last Time: Phase Digrams Temperature 2 The Critical Temp Heat liquid in closed container never boils. Why? High density gas and low density liquid become indistinguishable Liquid-vapor interface (meniscus) vanishes The Critical Point Critical Temperature: T above which no P can turn a gas into a liquid Supercritical Fluid: Gas-like and liquid-like Permeable and good solvent e.g. Supercritical CO 2 efficient, safe, tasteless solvent to remove caffeine 3 Types of Intermolecular Forces Opposite charges attract ! Interionic Forces MP of crystalline salt? Solubility in water? Polar Molecules - Dipoles Electronegativity based electron/nucleus attraction C O H H + O H H + + Dipoles interact strongly polar molecules tend to have high boiling points 4 Instantaneous dipoles. Instantaneous dipoles....
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LECTURE6 - 1 Midterm 1 Monday Apr 18 th In class....

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