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Chemistry
121, Winter 2008, LA Tech
Molecular Structure and Physical
Properties
•Bp decreases with hydrocarbon chain branching due to decrease in surface
area which results in fewer intermolecular attractions.
• Mp increases with hydrocarbon chain
branching because the more compact molecules have a better fit in the crystal lattice
making it more stable.
•Solubility - the quantity of solute that will
dissolve in a solvent depends on polarity of solute and
solvent.
“Like dissolves like” refers to polar
liquids tending to dissolve polar solutes and nonpolar liquids tend to
dissolve
nonpolar solutes. Alkanes are
nonpolar.