### Exam 3 - Bonding Theories and IMFs

##### What the Student Brings to Exams
• official UT ID card (with your picture and name on it)
• a simple scientific calculator (not a graphing calculator)
• NO calculator allowed for exam 3
• a pencil(s) and eraser
• memorized formulas in your head - not on paper or anything else
• nothing else is allowed
##### What we provide for the Exams
• A printed copy of the exam (every exam has a unique version number on it).
• An exam cover page that has ALL needed conversion factors and data. No formulas will be given.
• A periodic table of the elements with symbols, atomic number, and atomic weights.

##### Energies of Various Interactions

ion-ion: $$\displaystyle E_p\propto -{q_1q_2\over r}$$

ion-dipole: $$\displaystyle E_p\propto -{|q|\mu\over r^2}$$

dipole-dipole: $$\displaystyle E_p\propto -{\mu_1\mu_2\over r^3}$$

dispersion: $$\displaystyle E_p\propto -{\alpha_1\alpha_2\over r^6}$$

NOTE: Although there are no calculations on the exam, these formulas will help you further understand the differences in the various interactions between molecules and ions.

##### These 2 Helpsheets are exactly that... "helpful"

VSEPR Geometries & VB Hybrids

Intermolecular Forces

##### What we provide on the exam cover page

Really nothing to provide on this exam.

Remember that all the bonding and shapes really require no data to figure them out. You simply apply the correct theory to the problem (VSEPR, VB, or MO theories). Plus, any polarity is handled by knowing the overall trends in electronegativity on the periodic table. Knowing your periodic trends will aid you greatly in figuring out which molecular or ionic interaction is greater than another.