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CHAPTER 11 notes

CHAPTER 11 notes - -Supercritical fluid is the state of...

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CHAPTER 11 Phase Diagram - It gives the relationship between solid, liquid, and gas. Phases at different conditions of temperature and pressure. - Solid lines (curves) are two phases at EQ. Triple point, are three phases at EQ. Critical point, last point in the r←> curve. - Critical point is defined by the critical temp. and the critical temp, Tc, is the temp above which it is impossible to liquefy the gas. No matter how high the pressure is. The critical pressure, Pc is the minimum pressure needed to liquefy the gas at Tc. Supercritical fluid is the state of matter beyond the critical point (its not a liquid, its not a gas) Solid lines (curves) are two phases at EQ. Triple point, are three phases at EQ. Critical point, last point in the r←> curve. Critical point is defined by the critical temp. and the critical temp, Tc, is the temp above which it is impossible to liquefy the gas. No matter how high the pressure is. The critical pressure, Pc is the minimum pressure needed to liquefy the gas at Tc.
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Unformatted text preview: -Supercritical fluid is the state of matter beyond the critical point (its not a liquid, its not a gas) Effect of Pressure Instantaneous fluctuation of the electronic cloud creates an electric dipole The instant dipole creates induced dipole in the nearest neighbor particle. These attractions are present between any two atoms or molecules or ions. The larger the atom or molecule, the more easily the electron cloud is polarized. The larger the molecule (MM –higher) stronger London dispersion forces, higher boiling point Dipole-Dipole forces: Electrostatic forces between polar molecules Polar molecules have permanent dipole In a condensed state (EQ) the molecules orient themselves to maximize the +…- interactions and minimize +…+ and -…- interactions Hydrogen: Hydrogen bond is the interaction between hydrogen links electronegative elements: O, N, I … (small and highly electronegative)...
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