Counting Atoms 2a
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Counting Atoms 2a

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    Counting Atoms 2a Counting Atoms 2a Presentation Transcript

    • Writing Symbols
      • MG or Mg or mg
      • All symbols are written with a capital letter first.
      • If it is a one letter symbol it is capital
      • If it is a two letter symbol first is capital, second letter is lowercase
      • Mg O Ni Co N Cs K Be
    • Counting Atoms
      • The number of atoms is written as a subscript
      • AlCl 3 = 1 aluminum, and 3 chlorine
      • Na 2 O = 2 sodium, and 1 oxygen
      • 1 is never written and is always understood
    • Counting Atoms
      • 3Li 2 O = 6 Lithium and 3 Oxygen.
      • A number in front must be distributed through the entire compound.
      • 6C 6 H 12 O 6 = 36 Carbons, 72 Hydrogens, 36 Oxygens
    • Counting Atoms
      • Pb(OH) 2 = 1 Lead, 2 Oxygen, 2 Hydrogen
      • In parenthesis the subscript indicates the number of everything in the parenthesis and therefore must be distributed through.
      • Al 2 (SO 4 ) 3 = 2 Aluminum, 3 Sulfur, 12 Oxygen
    • Counting Atoms
      • NH 4 NO 3 = 2 Nitrogen, 4 Hydrogen, 3 Oxygen
      • If an element appears in two different places it must be added together and totaled.
      • 2H 3 C 6 H 5 O 7 = 12 Carbon, 14 Oxygen, 16 Hydrogen
    • Practice
      • 1.     KOH 2.     Hg(OH)
      • 3.     FeCl 3 4.     NH 4 OH
      • 5.     CCl 4 6.     Pb(OH) 2
      • 7.     NH 4 NO 3 8.     Al 2 (SO 4 ) 3
      • 9.     Li 2 O 10.   Na 2 SO 3
      • 2H 2 12. 2NaCl
      • 13. 6H 2 O 14.    3C 2 H 6
      • 15.    2Al 2 O 3 16.    4AgNO 3
      • 17.    5C 2 H 6 O 18.    H 3 C 6 H 5 O 7
      • 19.    2Ga(OH) 3 20. 3Pb(NO 3 ) 2