MOLECULAR ORBITAL MODEL
LE model problems:
Concept of resonance (electrons are not localized)
Model does not predict magnetic or spectral (EM radiation) properties
Model gives no direct information about bond energies
MO Theory and Electron Models
October 23, 2014
Happy Mole Day!
NA = 6.022 x 1023 atoms/mole
Partial Solar Eclipse peaking at 5:56
Top of RLM: Viewing with solar telescope and
optical telescopes with solar filters starting at
Agenda for Today
1. Questions about the exam?
2. Polar bonds- dipole moment and importance of symmetry
3. VSEPR Theory
2014 Nobel in Chemistry
If a molecule has a center of positive c
Can be observed without changing the identity and composition of the substance
Examples include color, odor, density, melting point, boiling point, hardness
Describe how a substance reacts to form
Localized Electron Model
(a.k.a. Valence Bond Theory)
Localized Electron Model
Lewis Dot Model
Fulfill noble gas
Molecules: Collection of atoms boun
Build these compounds and rank the bond energy and bond length based on bond order:
1. What are the relationships among bond order, bond energy, and bond length? Which of
these quantities can be measured?
2. What type of experiment
Molecular Orbital Problem Set #2
1) According to molecular orbital theory, which of the following is NOT predicted to exist?
2) He23) He
5) All are predicted to exist
2) Which of the following species possesses a delocalized bond?
GE 206D: Supplemental Instruction for CH 301
Problem Set 15
November 4, 2014
Exam 3 Review Questions - Lewis Structure, VSEPR, Hybridization, MO Theory,
IMF, Liquids, and Solids
1. Methylamine, CH5 N, is responsible for the characteristic odor of decaying
Problem Set #17
1. Predict the sign of S for each of the following changes.
2. Calculate the change in entropy that occurs when a sample containing 2 mol of water is
heated from 50C to 150C at 1 atm pressure. The molar heat capacities for H2O(l) a
Problem Set #16
Introduction to Thermodynamics
1) Provide definitions for:
b. The First Law of Thermodynamics
2) Which of the following are state functions?
pressure, volume, temperature, work, heat, internal energy
3) Consider a
2. This is azidothymidine (AZT) C10H13N5O4, a drug used in the treatment of A
1. Covalent bonds are the only type of bond or intermolecular forces (besides LDF) in:
e. C (diamond).
2. A white substance melts with some decomposition at 730 oC. As a solid, it is
Problem Set #6
Electron Configuration and Periodic Table Trends
1. Draw representations of ground state electron configurations using the
orbital notation () for the following elements. Also, give the ground state
electron configurations in shorthand nota
Problem Set #4
1. Arrange the following types of photons of electromagnetic radiation in order of
increasing energy: -rays, x-rays, visible light, ultraviolet radiation,
2. Calculate the wavelengths (in nm) of the light f
Problem Set #5
Bohr Model, Particle in a Box, Quantum Numbers
1. Use the Bohr model to calculate the energy of the B 4+ ion in the n=3 state.
How much energy would be required to remove the electrons from one mole
of B4+ ions in this state? What frequency
PROBLEM SET #1 GENERAL REVIEW
Part 1. General Review Significant Figures and Dimensional Analysis
Remember to provide the units of your answers and to watch your significant digits.
1. For each of the following, underline the zeros that are significant fi
Problem Set #3
KMT and Real Gases
1. Indicate whether, according to kinetic molecular theory, the statements below are true (T) or false (F):
a. When gas molecules collide with their container, they transfer energy to it that is proportional to
Problem Set 2
1. Plot the data in the table below. Place volume [in3] on the x-axis (abscissa) and pressure [in
Hg] on the y-axis (ordinate). Describe which gas law this experimental data supports? How
would you plot the same data to determine the constan