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Counting Atoms
Counting Atoms
Counting Atoms
Counting Atoms
Counting Atoms
Counting Atoms
Counting Atoms
Counting Atoms
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Counting Atoms

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  1. COUNTING ATOMS
  2. RULES FOR COUNTING ATOMS <ul><li>SUBSCRIPTS only refer to the atom that they are BEHIND . For example… </li></ul><ul><li> H 2 S </li></ul><ul><li>There are TWO atoms of HYDROGEN and only ONE atom of SULFUR . </li></ul>
  3. COEFFICIENTS <ul><li>COEFFICIENTS apply to the entire compound. You MULTIPLY the coefficients and SUBSCRIPTS . </li></ul><ul><li> 2 H 2 S </li></ul>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 <ul><li>3. If elements or compounds are inside of PARENTHESES , then the SUBSCRIPT behind the parentheses applies to everything inside. </li></ul>Ba(OH) 2 ATOMS OF BARIUM: ATOMS OF OXYGEN: ATOMS OF HYDROGEN: 1 2 2
  5. LET’S PRACTICE! <ul><li>MgCl 2 </li></ul><ul><li>Atoms of Magnesium: </li></ul><ul><li>Atoms of Chlorine: </li></ul>1 2 Al 2 S 3 Atoms of Aluminum: Atoms of Sulfur: 2 3
  6. PRACTICE <ul><li>H 2 SO 4 </li></ul><ul><li>Atoms of Hydrogen: </li></ul><ul><li>Atoms of Sulfur: </li></ul><ul><li>Atoms of Oxygen: </li></ul>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… <ul><li>Ca 3 (PO 4 ) 2 </li></ul><ul><li>Atoms of Calcium: </li></ul><ul><li>Atoms of Phosphorus: </li></ul><ul><li>Atoms of Oxygen: </li></ul>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??? <ul><li>2Ca 3 (PO 4 ) 2 </li></ul><ul><li>Atoms of Calcium: </li></ul><ul><li>Atoms of Phosphorus: </li></ul><ul><li>Atoms of Oxygen: </li></ul>6 4 16

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