Counting Atoms
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Counting Atoms

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Counting Atoms Counting Atoms Presentation Transcript

  • COUNTING ATOMS
  • RULES FOR COUNTING ATOMS1. SUBSCRIPTS only refer to the atom that they are BEHIND. For example… H2 S There are TWO atoms of HYDROGEN and only ONE atom of SULFUR.
  • COEFFICIENTS2. COEFFICIENTS apply to the entire compound. You MULTIPLY the coefficients and SUBSCRIPTS. 2 H2 S ATOMS OF HYDROGEN: 4 ATOMS OF SULFUR: 2 IF THERE ISN’T A SUBSCRIPT BEHIND AN ELEMENT, ASSUME THERE IS ONLY ONE ATOM OF THAT ELEMENT!
  • PARENTHESES3. If elements or compounds are inside of PARENTHESES, then the SUBSCRIPT behind the parentheses applies to everything inside. Ba(OH)2 ATOMS OF BARIUM: 1 ATOMS OF OXYGEN: 2 ATOMS OF HYDROGEN: 2
  • LET’S PRACTICE! MgCl2Atoms of Magnesium: 1Atoms of Chlorine: 2 Al2S3Atoms of Aluminum: 2Atoms of Sulfur: 3
  • PRACTICE H2SO4Atoms of Hydrogen: 2Atoms of Sulfur: 1Atoms of Oxygen: 4 CH3OHAtoms of Carbon: 1Atoms of Hydrogen: 4Atoms of Oxygen: 1
  • THIS COULD BE A LITTLE TRICKY… Ca3(PO4)2Atoms of Calcium: 3Atoms of Phosphorus: 2Atoms of Oxygen: 8 Al2(SO4)3Atoms of Aluminum: 2Atoms of Sulfur: 3Atoms of Oxygen: 12
  • What about this BAD BOY??? 2Ca3(PO4)2Atoms of Calcium: 6Atoms of Phosphorus: 4Atoms of Oxygen: 16