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COUNTING ATOMS.

Published byDrew Garbutt Modified over 2 years ago

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Presentation on theme: "COUNTING ATOMS."— Presentation transcript:

1 COUNTING ATOMS

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 COEFFICIENTS apply to the entire compound. You MULTIPLY the coefficients and SUBSCRIPTS. 2 H2S 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! MgCl2 Atoms of Magnesium: Atoms of Chlorine: 1 2 Al2S3
Atoms of Aluminum: Atoms of Sulfur: 2 3

6 PRACTICE 2 1 4 CH3OH Atoms of Carbon: Atoms of Hydrogen: 1
H2SO4 Atoms of Hydrogen: Atoms of Sulfur: Atoms of Oxygen: 2 1 4 CH3OH Atoms of Carbon: Atoms of Hydrogen: Atoms of Oxygen: 1 4 1

7 THIS COULD BE A LITTLE TRICKY…
Ca3(PO4)2 Atoms of Calcium: Atoms of Phosphorus: Atoms of Oxygen: 3 2 8 Al2(SO4)3 Atoms of Aluminum: Atoms of Sulfur: Atoms of Oxygen: 2 3 12

8 What about this BAD BOY??? 2Ca3(PO4)2 Atoms of Calcium:
Atoms of Phosphorus: Atoms of Oxygen: 6 4 16

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