CHM135H1 Lecture Notes - Lecture 6: Trigonal Planar Molecular Geometry, Chemical Polarity, Bromine

• School: UTSG
• Department: Chemistry
• Course: CHM135H1
• Professor: Gilbert Walker, Eugenia Kumacheva, Kristine Quinlan

Document Summary

Chm135 lecture 6: review of bonding (unit 2) September 19, 2018 (relevant reading chemistry 7ed mcmurry/fay/robinson, chapter 6. 1, 6. 6, 6. 7, Bonds form because the molecule formed has a lower energy than the atoms apart. Generally, electrons are shared or transferred so that each atom has a filled valence shell (usually, but not always, an octet) Ionic bonding: electrostatic forces between oppositely charged ions formed from electron transfer. Coulombic attraction provide enough energy to cause salt formation: an element with low ionization energy will transfer an electron to another element with high electron affinity (e. g. Covalent bonding: electrons shared between atoms, unpaired electron, unfilled valence shell, electrons are shared rather than transferred due to attraction between electrons and nucleus, and repulsion from proton-proton and electron-electron interactions. Important for: solubility, state of matter, boiling point, melting point. Lower boiling point indicates that it took less kinetic energy to overcome the intermolecular forces.