CHEM 201DL Study Guide - Midterm Guide: Nucleophile, Pi Bond, Redox
8 Feb 2016
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Combustion of alkanes: cnh2n+2 + o2 co2 + h2o. Heat of combustion: oxidation of c = increase in the # of bonds between c and o and/or decreases , chain length: increase # of cs increase moles of o2 consumed more moles of. Co2 and h2o formed greater (more +) heat of combustion (less stable: chain branching: greater branching lower (more -) heat of combustion (more stable) Assigning priorities (cahn-ingold-prelog: look at first atom attached to each c in c=c, compare atomic #s, compare mass of isotopes, do first point of difference between bonding. Saturated: highest number of hs possible, no c=c. Unsaturated: 1 or more c=c: add 1 degree of unsaturation per pi bond. H goes to less substituted c ( hydrogen goes where hydrogen is ) Torsional strain: repulsion between electrons in eclipsed bonds. Steric strain: the collision of atoms in space. Region of the molecule where the bonding takes place.
