CHEM 1410 Lecture Notes - Lecture 31: Polarizability, Partial Charge, Boiling Point
9 Nov 2016
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Last class: during boiling, heat energy enters the water. That energy does not cause a change in temperature (t), but is instead used to overcome forces of attraction holding molecules together in the liquid. Negative ereaction indicates products have a lower e than reactants. Positive ereaction indicates products have a higher e than reactants. Not spontaneous, uphill , unfavorable, requires input of e. Boiling has a positive ereaction, so it needs energy input to occur. That energy usually takes the form of added heat ( ) Heat (or enthalpy) of vaporization: energy needed to boil a substance at the boiling point (b. p) Heat (or enthalpy) of fusion: energy needed to melt a substance that is already at its melting point (m. p) Intermolecular forces (imf): collectively the forces of attraction between particles. : some space in structure for particles to move. *liquid is the only phase were imf are broken and created continuously.
