Sec 12

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Author:
saitclt
ID:
188838
Filename:
Sec 12
Updated:
2012-12-11 19:00:26
Tags:
THRM 358
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Description:
THRM 358
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  1. What type(s) of motion does matter in the solid state exhibit?
    Vibrational
  2. What type(s) of motion does matter in the liquid state exhibit?
    Rotational & Vibrational
  3. What type(s) of motion does matter in the gaseous state exhibit?
    Translational, Rotational & Vibrational
  4. Define Chemical Properties & give an ex.
    • breaking of bonds between atoms and them forming new bonds between these same atoms
    • ex. combustion
  5. define physical properties & give an ex.
    • changes in bonds between molecules not between atoms within molecules.
    • ex. Melting
  6. What are Dipole Attractions & an ex.
    • intermolecular
    • when a molecule has covalent bonds with a significant electronegativity difference
    • results in high melting and boiling points
    • ex. HCl, H2S
  7. What are Hydrogen Bonds & 1 ex.
    • intermolecular
    • when a molecule has covalent bonds with a very significant electronegativity difference (N,O,F)
    • very high melting and boiling points
    • ex. HF
  8. What are Van der Waals Forces (L.D)
    • intermolecular
    • when a molecule has covalent bonds with very low electroneg difference or none at all
    • low melting and boiling points
  9. What are Covalent Bonds & an ex.
    • Intramolecular
    • Non-M bond with Non-M
    • low electroneg difference
    • localized bonding ex. CH4
  10. What are Ionic bonds and an ex.
    • Intramolecular
    • Non-M bond with M
    • higher electroneg difference then covalent bonds
    • results in crystals of oppositely charged units
    • ex. NaCl
  11. What are Metallic Bonds & an ex.
    • Intramolecular
    • M - M
    • extremely low electroneg, therefore el- flow through the crystal
    • results in crystals which conduct and are malleable
    • ex. Fe

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