CHEM 1410 Lecture Notes - Lecture 35: Boiling Point, London Dispersion Force, Magic 2Ch
22 Nov 2016
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*the partial negative charge on the oxygen creates a dipole-dipole imf with the partial positive charge on the ch2, london dispersion forces are also possible. *stronger imf = higher boiling point: ch3-o-ch3 dipole-dipole, ch3-ch2-ch2-o-h dipole-dipole, ch3-ch2-o-ch3 h-bonding, ch3-ch2-ch2-ch2-oh h-bonding. *choices c and d are the strongest because h-bonding is stronger than dipole-dipole interactions, but choice d has the larger surface area meaning it has more london forces. As a solid (the system) melts at a constant temperature, it gains energy from the environment. This is because the system must absorb energy in order for melting to occur, by increasing the. K. e. of the particles and turning the solid into a liquid. Sublimation: solid gas , without ever being a liquid. The correct graph is the one in which 1 atm (normal conditions) intersects the graph at a phase change between a solid and a gas. *all hydroxides (oh) are insoluble except those of na+ and k+
