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Counting Atoms 9/26/16 Mr. Devore.

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Presentation on theme: "Counting Atoms 9/26/16 Mr. Devore."— Presentation transcript:

1 Counting Atoms 9/26/16 Mr. Devore

2 RULES FOR COUNTING ATOMS
SUBSCRIPTS only refer to the atom that they are BEHIND. For example… H2S There are TWO atoms of HYDROGEN and only ONE atom of SULFUR

3 COEFFICIENTS 2. COEFFICIENTS apply to the entire compound. You MULTIPLY the coefficients and SUBSCRIPTS. 2 H2S 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!

4 PARENTHESES 3. If elements or compounds are inside of PARENTHESES, then the SUBSCRIPT behind the parentheses applies to everything inside. Ba(OH2)3 Atoms of Barium : 1 Atoms of Oxygen: 3 Atoms of Hydrogen: 6

5 PRACTICE MgCl2 Al2S3 H2SO4

6 PRACTICE CH3OH Al2(SO4)3 2Ca3(PO4)2

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