VAN DER WAAL'S FORCES

• OTHER NAMES FOR VAN DER WAAL'S FORCES?

  • London dispersion forces
  • transient induced dipole-dipole forces (TIDDI)
• WHERE ARE VAN DER WAAL'S FORCES PRESENT?

  all molecular substances
• WHY DO VAN DER WAAL'S FORCES OCCUR?

  electrons are constantly moving around, causing an uneven electron distribution (creates temporary dipole)
• WHAT DOES THE TEMPORARY DIPOLE IN ONE MOLECULE DO?

  induces temporary dipole in neighbouring molecule, causing an attraction between the molecules
• WHAT HAPPENS TO VAN DER WAAL'S FORCES AS MOLECULES GET BIGGER?

  greater (more electrons)
• WHERE ARE VAN DER WAAL'S FORCES NOT FOUND?

  ionic compounds
• WHAT DO VAN DER WAAL'S FORCES RELY ON?

  spherical symmetry
• ARE VAN DER WAAL'S IN ADDITION TO OTHER FORCES?

  yes