COUNTING ATOMS.

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COUNTING ATOMS.

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Presentation transcript:

COUNTING ATOMS

RULES FOR COUNTING ATOMS SUBSCRIPTS (atoms) only refer to the element that they are BEHIND. For example… H2S There are TWO atoms of HYDROGEN and only ONE atom of SULFUR.**No number = 1**

“We Do” 1. Ca2O Element: _______ # of Atoms: ______ HgCO3

“You Do” 1. PbSO3 Element: _______ # of Atoms: ______ NH4OH

COEFFICIENTS COEFFICIENTS apply to the entire compound. You MULTIPLY the coefficients and SUBSCRIPTS. 2 H2S ATOMS OF HYDROGEN: ATOMS OF SULFUR: 2 x 2 = 4 1 x 2 = 2 IF THERE ISN’T A SUBSCRIPT BEHIND AN ELEMENT, ASSUME THERE IS ONLY ONE ATOM OF THAT ELEMENT!

“We Do” 1. 4Ca2O Element: _______ # of Atoms: ______ 2HgCO3

“You Do” 1. 3PbSO3 Element: _______ # of Atoms: ______ 4NH4OH

PARENTHESES 3. If elements or compounds are inside of PARENTHESES, then the SUBSCRIPT behind the parentheses applies to everything inside the parentheses ONLY. Ba(OH)2 ATOMS OF BARIUM: ATOMS OF OXYGEN: ATOMS OF HYDROGEN: 1 2 2

“We Do” “You Do” Ca3(PO4)2 Al2(SO4)3 Element: _______ # of Atoms: ______ “You Do” Al2(SO4)3 Element: _______ # of Atoms: ______

What about this BAD BOY??? 2Ca3(PO4)2