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Counting Atoms

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  • 1. COUNTING ATOMS
  • 2. RULES FOR COUNTING ATOMS
    • SUBSCRIPTS only refer to the atom that they are BEHIND . For example…
    • H 2 S
    • There are TWO atoms of HYDROGEN and only ONE atom of SULFUR .
  • 3. COEFFICIENTS
    • COEFFICIENTS apply to the entire compound. You MULTIPLY the coefficients and SUBSCRIPTS .
    • 2 H 2 S
    ATOMS OF HYDROGEN: ATOMS OF SULFUR: 4 2 IF THERE ISN’T A SUBSCRIPT BEHIND AN ELEMENT, ASSUME THERE IS ONLY ONE ATOM OF THAT ELEMENT!
  • 4. PARENTHESES
    • 3. If elements or compounds are inside of PARENTHESES , then the SUBSCRIPT behind the parentheses applies to everything inside.
    Ba(OH) 2 ATOMS OF BARIUM: ATOMS OF OXYGEN: ATOMS OF HYDROGEN: 1 2 2
  • 5. LET’S PRACTICE!
    • MgCl 2
    • Atoms of Magnesium:
    • Atoms of Chlorine:
    1 2 Al 2 S 3 Atoms of Aluminum: Atoms of Sulfur: 2 3
  • 6. PRACTICE
    • H 2 SO 4
    • Atoms of Hydrogen:
    • Atoms of Sulfur:
    • Atoms of Oxygen:
    2 1 CH 3 OH Atoms of Carbon: Atoms of Hydrogen: Atoms of Oxygen: 1 4 4 1
  • 7. THIS COULD BE A LITTLE TRICKY…
    • Ca 3 (PO 4 ) 2
    • Atoms of Calcium:
    • Atoms of Phosphorus:
    • Atoms of Oxygen:
    3 2 Al 2 (SO 4 ) 3 Atoms of Aluminum: Atoms of Sulfur: Atoms of Oxygen: 2 3 8 12
  • 8. What about this BAD BOY???
    • 2Ca 3 (PO 4 ) 2
    • Atoms of Calcium:
    • Atoms of Phosphorus:
    • Atoms of Oxygen:
    6 4 16