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TOLEDO / Organic Chemistry / CHEM 2410 / Can resonance structures have different formal charges?

Can resonance structures have different formal charges?

Can resonance structures have different formal charges?

Description

School: University of Toledo
Department: Organic Chemistry
Course: Organic Chemistry 1
Professor: Joseph schmidt
Term: Fall 2016
Tags: Organic Chemistry, Chemistry, and Science
Cost: 25
Name: Week 2 - Organic Chemisty I: Lecture Notes
Description: The notes cover the basics or bond theory and the role of electron repulsion in the geometry of a molecule as discussed in week 2 of lectures.
Uploaded: 09/05/2016
2 Pages 40 Views 1 Unlocks
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Organic Chemistry I Week 2 Lecture Notes Dr. Joseph Schmidt


An resonance structures have different formal charges?



Lewis structures and electron interactions 

❖ Resonance structures

➢ Between multiple resonance structures the “real” one is an average or “in between” of all of them

➢ The favored resonance structure is the one with the lowest formal charge ■ Formal charges can vary depending on resonance structure

■ Formal charge of atom  = # valence e­ ­ ½ # bonded e­ ­ # nonbonded e­ ❖ Shapes of molecules are closely linked with their properties and function ➢ To help predict shapes of molecules use the VSEPR (Valence­Shell Electron Pair Repulsion) to make models

■ VSEPR ­ States that electrons will want to be as far away from each other as possible to minimize repulsion


Which overlapping is strongest?



➢ Basic shapes and estimated bond angles…

■ Four electron regions

● Tetrahedral

◆ No lone pairs

◆ Bond angle about 109.5 degrees

● Trigonal pyramidal

◆ One lone pair

◆ Bond angle < 109.5 degrees

● Bent

◆ Two lone pairs

◆ Bond angle < 109.5 degrees

■ Three electron regions

● Trigonal planar

◆ Bond angle 120 degrees

■ Two electron regions

● Linear

◆ Bond angle 180 degrees

➢ Geometry of molecule must be taken in account to polarity


How do you apply vsepr theory to predict the shape of a molecule with more than one interior atom?



Don't forget about the age old question of What really happened on roanoke island?

■ Nonpolar molecules may have polar bonds that cancel

➢ Aufbau Principle

■ Electrons will go to the atomic orbital of lowest energy first if possible ➢ Pauli Exclusion Principle

■ No more than two electrons with opposite spins per orbital

➢ Hund’s Rule

■ When there are degenerate atomic orbitals, electrons will “go in alone” before occupying an orbital with an electron in it already

Organic Chemistry I Week 2 Lecture Notes Dr. Joseph Schmidt

➢ Valence Bond Theory Don't forget about the age old question of Who were some famous writers in the 1920s?
If you want to learn more check out What are the consequences of human behavior?
Don't forget about the age old question of How does the protestant ethic relate to capitalism?
We also discuss several other topics like Why is accounting regarded as an information system?
Don't forget about the age old question of When another researcher's theory opposed to a specific finding, which of the four ways of knowing are people relying upon to build an argument?

■ Model used to show how bonds may form by overlapping atomic orbitals

➢ Molecular Orbital Theory

■ Molecular orbitals created mathematically from combos of atomic orbitals ■ Relates to electrons behaving like waves

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