Intro movie

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Intro movie
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Intermolecular Forces

• Attractive forces between molecules
• Determine phase at room temperature
• 3 kinds
• Dispersion
• Dipole-dipole
• Hydrogen bonding
• Much weaker than forces within a molecule

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Intramolecular Force forces within a molecule

• A chemical bond is the force that holds two atoms
  together
• Due to electrostatic forces (charges)
• Bonding
• 1. ionic bonding metals and nonmetals
• 2. covalent bonding nonmetals and nonmetals
• 3. metallic bonding metals and metals

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So why do atoms bond?!

• Atoms attain a stable valence electron
  configuration by bonding with atoms.

• All atoms want to be like Noble Gases because
  they have a stable valance electron configuration
  (a full octet)

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What Noble Gases tell us

• Do not form compounds under ordinary conditions
• extremely stable
• 8 valence electrons great stability
• also low energy!

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Octet Rule Why Bonds Form

• Goal achieve noble gas electron config.
• - want 8 valence electrons (H wants a total of 2)
• Why Low energy, high stability state
• How Atoms form bonds by
• gaining
• losing, or
• sharing electrons

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Energy Stability

• High Energy means Low Stability
• Low Energy means High Stability

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Stability in Chemical Systems

• If it exists, its stable!
• Of course, some things are more stable than
  others!

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Quick Quiz

• Elements in the same column have the same
  ____________________________.

number of valence electrons

• Elements with the same number of
• valence electrons have similar
  _____________________________.

chemical properties
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3 Types of Bonding

• Ionic electrons are transferred
• Covalent electrons are shared
• Metallic sea of mobile electrons