Intermolecular Forces Chem 1C

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  1. intramolecular forces
    chemical bonds
  2. intermolecular forces
    attraction or repulsion between molecules
  3. molecule remains __ in intermolecular forces
  4. How much weaker are intermolecular forces than chemical bonds
  5. In which state are intermolecular forces the strongest
  6. Decreasing order of energies 5 bonds
    • Ionic
    • Covalent
    • Hydrogen
    • Dipole-Dipole
    • London Dispersion Force
  7. Dipole-Dipole
    Attraction between polar molecules
  8. Dipole-Dipole what ends attract eachother
    Positive and negative end
  9. Vaporization
    Molecules have enough KE to overcome intermolecular forces
  10. Boiling point and intermolecular forces
    Greater intermolecular forces=higher boiling point
  11. Hydrogen Bonding
    Dipole-dipole bonding that can only occur with N, O, or F
  12. Hydrogen bonding: mass and boiling point
    Lightest molecule has the highest boiling point
  13. London Dispersion force
    Induced dipole that is present in all molecules
  14. London Dispersion Force and molecular size
    • Bigger atom=greater LDF
    • Longer molecule=greater LDF
  15. Capillary Action
    Rising of liquid in a narrow tube
  16. Cohesive Force
    Molecules attracted to each other
  17. Adhesive Force
    Molecules attracted to the walls of the capillary
  18. How does capillary action work in a graduated cylinder?
    Cohesive forces between H2O molecules and adhesive forces between SiO2 molecules in glass
  19. How do molecules arrange themselves
    To have maximal intermolecular interactions
  20. Why do liquids form drops
    • Minimize surface area: volume ratio
    • Molecules at surface don't have as many interactions, so lower the surface area
  21. Viscosity- 2 factors
    • Strong intermolecular forces
    • Large, complex molecules get tangled up with each other
  22. Crystalline Solid
    Highly ordered, molecules or ions are arranged in a specific array
  23. Amorphous Solid
    • Disordered, atoms, molecules, or ions are not in any particular order
    • Short-range order, long-range disorder
  24. Bragg Diffraction
    When you shine an X-ray on a crystal, X-rays bounce off
  25. Bragg Diffraction- what determines if waves add constructively or destructively
    distance travelled by parallel waves
  26. Bragg Diffraction- what does spacing between nuclei in crystals dictate?
    Whether you get a bright or dark spot
Card Set
Intermolecular Forces Chem 1C
Intermolecular forces chem 1C
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