Teflon coated non stick pans temperature 250 no acid

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Unformatted text preview: ctron clouds which are easier to polarize. Teflon-coated non-stick pans Temperature: < 250℃ No acid food! Very slippery Intermolecular Intermolecular Forces I (van der Waals forces) In liquid HCl 4. London Dispersion Forces 4. London Dispersion forces operate between all molecules Factors: Mass, Size, Shape Dispersion force tends to increase in strength with increasing molecular increasing molecular weight. Intermolecular Forces I (van der Waals forces) London London Dispersion Forces Natural gas Main components: Methane (CH4), Boiling Point: -161°C Gasoline Octane (C8H18) 125 °C Intermolecular Forces I (van der Waals forces) London Dispersion Forces London London Dispersion Forces depend on the shape of molecules shape The greater the surface area available for contact , the greater the dispersion forces Intermolecular Forces I (van der Waals forces) London London Dispersion Forces:depend on the shape shape of molecules Pyrene The greater the surface area available for contact, the greater the dispersion forces Intermolecular Forces II II Hydrogen Bonding hydrogen bond : a special dipole-dipole interaction dipolebetween they hydrogen atom in a polar N-H, O-H, or F-H hydrogen polar N- OFbond and an electronegative O, N, or F atom. O, or Increasing Increasing molecular weight → Increasing boiling point Boiling points of the group 4A-7A hydrides as a function of molecular weight Intermolecular Forces Hydrogen Bonding: Hydrogen bonds are responsible for Ice Floating Intermolecular Forces Hydrogen Bonding • Responsible for: – Protein Structure – Protein folding is a consequence of H-bonding. Intermolecular Forces Hydrogen Bonding Responsible for: DNA double helix Structure Intermolecular Forces Intermolecular Forces • • • • • • Forces Energy (kJ/mol) ep. Ion-dipole 40-600 Hydrogen bond 10-40 Dipole-dipole 5-25 Ion-induced dipole 3-15 D...
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