Ionic Compounds

Cards (16)

  • If the superscript (+/- sign on top) has no number, it is automatically 1
  • Changing Name to Chemical Formula
    Identify the elements in the compound & their charges, then use the Criss Cross Method to determine the subscripts
  • Criss Cross Method

    Shortcut used to determine the subscripts in chemical formulas by criss-crossing the numerical charges (superscripts) to determine the ratio
  • (Polyatomic) compounds have more than 2 elements; always use the Polyatomic Ions Chart; -ate, -ite, -ide tells you if it is a polyatomic ion
  • For elements ending in -ygen, -ogen, -ine, -orous, change the last 3/4 letters to the suffix ‘-ide’; for elements ending in -ic, change the last 2 letters to -ide
  • Noble Gases aren’t capable of bonding
  • Types of ions
    • Monoatomic Ions: only 1 atom
    • Polyatomic Ions: more than 1 atom
  • Ionic Compounds
    Forms from Ionic bond between nonmetals (-) & metals (+)
  • Ions are atoms with a charge; neutral atoms gain/lose electrons
  • Subscripts
    Represents the number of atoms
  • Changing Chemical Formula to Name
    Retain the first element’s name, then change the 2nd element’s last 3 or 4 letters into ‘-ide’
  • Name to Chemical Formula(Try it yourself)
    • Ca2+ Cl− -> CaCl2
    • Li+ Cl− -> LiCl
    • Mg2+ P−3 -> Mg3P2
  • Changing Chem. Formula to Name
    Retain the first element’s name, then find the polyatomic ion’s Chem Formula using the Polyatomic Ions Chart
  • Ionic Compounds

    More than one ion is present in the compound, use parentheses for multiple polyatomic ions, add subscripts for polyatomic ions when needed
  • Changing Name to Chem Formula
    Use the Polyatomic Ions & Criss Cross Method, add a parenthesis to indicate the presence of Polyatomic Ions, distinguish entire Polyatomic Ion as a single unit
  • Chemical Formula to Name(Try it yourself)
    • Li (Lithium) SO (Sulfate) -> Lithium Sulfate
    • Na (Sodium) CO (Carbonate) -> Sodium Carbonate