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Formulas

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Formulas Unit 6 - Bonding Formulas Chemical formula represents the type and number of atoms in the smallest representative unit of a compound Formula unit ... – PowerPoint PPT presentation

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Title: Formulas


1
Formulas
  • Unit 6 - Bonding

2
Formulas
  • Chemical formula represents the type and number
    of atoms in the smallest representative unit of a
    compound
  • Formula unit lowest whole number ratio of atoms
    in an ionic compound not a discreet molecule

3
Formulas
  • Writing Formulas
  • Binary Compounds compounds with 2 types of
    atoms
  • Examples NaCl, MgO, Al2O3

4
Formulas
  • Method for Writing Binary Compounds Formulas
  • Writing the elements as ions
  • Positive goes first!!
  • Cross the value of the charge to subscripts
  • MAKE THE CHARGE ZERO!
  • Reduce when necessary

5
Formulas
  • Transition metals ? The Exception
  • Have more than one valence
  • The charge is given as a Roman numeral in
    parenthesis after the word.

6
  • Sodium chloride
  • Magnesium sulfide
  • Calcium iodide
  • Lithium sulfide
  • Aluminum oxide
  • Magnesium phosphide
  • Lead (IV) chloride

7
Formulas
  • Ternary Compounds compounds with more than 2
    types of atoms
  • Contains polyatomic ions a group of elements
    with a charge (back of periodic table)

8
Formulas
  • Method for Ternary Compounds
  • Write the ions out
  • Put the positive ion first
  • Cross the charges to subscripts
  • Keep the polyatomic ions together!

9
  • Sodium hydroxide
  • Potassium sulfite
  • Aluminum carbonate
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