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Lecture 1

CHEM 112 Lecture Notes - Lecture 1: London Dispersion Force, Boiling Point, Strong Interaction


Department
Chemistry
Course Code
CHEM 112
Professor
John Carran
Lecture
1

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Properties of Carbon
- Second row of periodic table
- Atomic # = 6
-can form bonds with one, two or three other carbon atoms; this is not
possible for atoms of nearly any other element
- Can form up to four bonds
All organic compounds have London dispersion forces. -- low boiling points
TYPES OF INTERMOLECULAR FORCES
LONDON DISPERSION FORCES
- weak attractive forces
- originate from electrostatic interactions w/in molecule
- strength increases as the mass and # of electrons in a molecule
increase, because they have a larger surface area to display the
electrostatic force.
-Thus, the higher the molecular weight, the higher the boiling
point.
DIPOLE- DIPOLE
Dipole-dipole= attraction between the opposite ends of polar compounds.
HYDROGEN BONDS
Hydrogen bonds exist between the hydrogen of one molecule containing N,
O, or F and the N, O, or F of another molecule.
Strong force so high boiling point!
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