UB CHE 101 - Final Exam Study Guide (7 pages)

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Final Exam Study Guide

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Final Exam Study Guide


This study guide covers part 3 of the course lectures, combined with the other 2 study guides you would have all final exam material.

Study Guide
University at Buffalo, The State University of New York
Che 101 - General Chemistry Lecture
General Chemistry Lecture Documents

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CHE 101 Final Study Guide Chapter 10 Bonding and Lewis Structures Want 8 VE by sharing or having on its own Types of Bonds 1 Metallic share electrons because metals lose electrons easily 2 Ionic transfer electron to get octet a Metals lose and nonmetals gain b Stability more positive more stable 3 Covalent share electron in molecular compounds a More electrons strong bond short bond 4 Possible Bond Distributions Electronegativity Bonded atoms ability to attract electron in bond strength of bond Higher EN means better at attracting electron EN determines amount of sharing o Nonpolar covalent electron shared equally 0 0 4 identical nonmetal atoms o Polar covalent electron shared unequally 0 4 2 different nonmetal atoms o Ionic electron transferred 2 4 Polarity describes electron sharing Dipoles Partial negative charge more electrons around ion Partial positive charge less electrons around ion Atom with higher EN gets partially negative end Lewis Structures Show covalent bonding use VE and octet rule Exceptions to octet rule o Incomplete octet EN too low to get more electrons Be has 2 VE and stable with 4 B has 3 VE and stable with 6 o Expanded Break octet possible for electrons in periods 3 6 Unfilled d orbital or large size of central atom Drawing Lewis Structures 1 Calculate total VE in molecule a V of atoms VE of atoms VE charge 2 Determine central atom least EN atom a H never central atom sometimes can have multiple centrals b C always central and rarely has lone pairs 3 Draw skeleton structure a Single or multiple bonds try for symmetry 4 Fill in octets with lone pair electrons to outer atoms then central a of electrons must equal V from step 1 of bonds 5 Calculate formal charge FC a FC VE unshared electrons of lone e pairs shared 2 b Must add up to charge on molecule c Only indicate non zero charge 2 A 3 A 4 A 5 A 6 A 7 A 2 3 4 3 2 1 0 0 0 1 2 3 Resonance More than one structure can be drawn because of o Presence of multiple bonds and or central atom can break

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