CHEM 1951 Study Guide - Midterm Guide: Density Functional Theory, Antibonding Molecular Orbital, Valence Bond Theory

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emeraldhamster436

10 Jan 2017

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Document Summary

Linear 180 (nonpolar: repulsion trend, lp-lp>bp-lp>bp-bp, distortion- change in geometry caused by lone pairs, vsepr theory, predicts molecular structure, bond angles, assumes e- pairs will arrange in a way to minimize repulsions, sizes occupied. Lone pair>triple bond>double bond>single bond: axial and equatorial positions. Single, sigma bonds can freely rotate: double, pi bonds can not. Triple, pi bonds can rotate, but not as freely as single bonds: valence theory does not address how e- are actually delocalized throughout the structure, orbital diagrams, constructive interference- bonding orbital. Lower energy: destructive interference- antibonding orbital, unstable, higher energy, bond order= (#bonding e-)- (antibonding e-)= # of bonds, up through n2 and including it-mixing occurs (pi and sigma orbitals switch) creates nonbonding. Atoms with 3 or fewer e- in the p orbitalssigma p is higher in energy than the pi p orbital (switch positions, pi p orbital is below)

Related Questions

a. Draw the Lewis structure of showing all lone pairs.

b. Is molecule polar or nonpolar?

c. Is the molecular geometry of a square planar, trigonal pyramidal, linear, trigonal planar, see-saw, square pyramidal, trigonal bipyramidal, bent, tetrahedral, T-shaped, octahedral?

d. What are the approximate bond angles in ? Select what may be applied if 90degrees, 109.5degrees, 120degrees, 180degrees

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Draw the Lewis structure for , then answer the following questions:

a. How many valence electrons does this compound have?

b. How many bonded electrons does this compound have?

c. How many lone pairs of electrons does this compound have?

d. How many single bonds does this compound have?

e. How many double bonds does this compound have?

f. What is the electron group arrangement (aka electron pair geometry) (enter one of the following: linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral)?

g. What is the molecular arrangement (aka shape) (enter one of the following: linear, trigonal planar, tetrahedral, trigonal pyramidal, bent, trigonal bipyramidal, seesaw, T-shaped, octahedral, square pyramidal, square planar)?

h. Predict the approximate bond angle (enter e.g. 90, 109.5, 120, 180, <109.5, >109.5).