CHEM 211 Lecture Notes - Lecture 11: London Dispersion Force, Higher Alkanes, Glossary Of Ancient Roman Religion
29 Sep 2016
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Energy: making bonds releases energy out, breaking bonds requires energy to be put in, h. Keq and g relationship: g = rt ln keq. R is the gas constant 8. 314 jk-1. For a reaction to favor the formation of prodcuts when equilibrium is reached, it must have a negative value for g . For reactions with a positive g , the formation of products at equilibrium is unfavorable: keq = products / reactants. Activation energy = energy it takes to get a reaction going. S is the entropy energy: a negative value for h will contribute to making g negative and will favor the formation of the products. Alkanes and cycloalkanes: alkanes and cycloalkanes, single bonds, sp3. Constitutional isomers: c4 and higher alkanes exist as constitutional isomers. The # of isomers increases rapidly with the carbon #. Boiling point: straight chain alkanes have the highest boiling point. Because they maximize the london dispersion forces.
