NSCI 1322 Study Guide - Silicon Dioxide
10 Sep 2015
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Document Summary
Vsepr model: predict the geometry from electrostatic repulsions between electrons (bonding and non-bonding) This decreases the angle in the geometric shape. Vsepr lone pair stuff diagrams on sheet. Count the lone pairs on the central atom and the number of bonds on the central atom. Use the vsepr to predict the geometry of the molecule. Dipole moment: quantitative measurement of the polarity of a bond (also dependent on the shape of the molecule) Co2 is a nonpolar molecule w/ polar bonds (as seen on the right) (dipole moment) = (charge) x (distance between charges) 1d = 3. 36 x 10-30 (c)(m) coolumb meters. Dipole moments are vectors they have direction and magnitude. Valence bond theory: the reason we have covalent bonds is because valence orbitals overlap (bonds form because orbitals are touching/overlapping) As the atoms move closer and closer, the density between the 2 atoms increases.
