Bond Length and Bond Energy Hexagonal
Flat Kathleen Lonsdale
Aromatic bonds Resonance Hexamethylbenzene
Chemistry Essentials - 052
bozemanscience.com Systems
Atoms
Attraction Repulsion
Bond Energy Bond Length
Breaking bonds Bond strength shorter
Double / Triple - Making bonds Charge Bonds bozemanscience.com Attraction Attraction
Repulsion Repulsion
Repulsion
Attraction
bozemanscience.com Atom Potential Energy vs. Internuclear Distance
0 H H
Bond length + Repulsion +
H H Bond energy - Attraction -
Potential Energy (kJ/mol) Potential 0
H0 H Internuclear Distance (pm)
bozemanscience.com Bond Energy 0
Bond Energy Energy absorbed when bond breaks
- Bond Energy Energy released when bond forms
Potential Energy (kJ/mol) Potential 0
Internuclear Distance (pm)
bozemanscience.com Bond Energy Electronegativity
Element Radius Bond Bond length Molecule Strength
Boron 83.0 pm B - B 175 pm B2Cl4 Weak
B B B B
166 pm 166
bozemanscience.com Bond Energy Electronegativity
Element Radius Bond Bond length Molecule Strength
Boron 83.0 pm B - B 175 pm B2Cl4 Weak
Rhenium 137.5 Re - Re 224 pm Re2Cl8 STRONG
Re Re Re Re
275 pm 275 pm bozemanscience.com Bond Number
Bond Length Bond Energy Bond (pm) (kJ/mol) ethane
C - C 154 331
C = C 134 590
C = C 120 812
N - N 145 159 acetylene
N = N 125 473
N = N 110 941
bozemanscience.com Did you learn?
To describe the energies involved in breaking and forming chemical bonds.
bozemanscience.com ! Acknowledgements
Cdang. Deutsch: Prinzip Des Laue-Verfahrens: Ein Einfallender Monochromatischer Röntgenstrahl Trifft Auf Ein Einkristall, Wird an Diesem in Bestimmte Richtungen Gebeugt Und Erzeugt Auf Der Dahinter Liegenden Fotoplatte Ein Beugungsmuster, March 30, 2009. Own work. http://commons.wikimedia.org/wiki/File:Cliche_de_laue_principe.svg. “File:Ethane-A-3D-Balls.png,” December 15, 2013. http://en.wikipedia.org/wiki/File:Ethane-A-3D-balls.png. “File:Hexamethylbenzene-3D-Balls.png,” December 15, 2013. http://en.wikipedia.org/wiki/File:Hexamethylbenzene-3D-balls.png.
bozemanscience.com www.bozemanscience.com