Counting Atoms - Dr. Sande's Chemistry Courses

Counting Atoms - Dr. Sande's Chemistry Courses

Counting Atoms Every chemical formula tells you how many atoms of each element there are in a compound. Important because if you can count atoms, you can balance equations. Heres an example

H 2O SUBSCRIPT How many H? How many O? SUBSCRIPTS only refer to the atom that they are BEHIND.

LETS PRACTICE! MgCl2 Atoms of Magnesium: Atoms of Chlorine: Al2S3 Atoms of Aluminum: Atoms of Sulfur:

What if you have 2 MOLECULES of water? What is this? 2H2O This is a COEFFICIENT

2H2O COEFFICIENTS apply to the ENTIRE formula. The 2 in front means that there are 2 molecules of water present! You MULTIPLY the coefficients and SUBSCRIPTS. 2H2O

How many hydrogen atoms are present? How many oxygen atoms are present? Lets practice 3H2SO4 Atoms of Hydrogen: Atoms of Sulfur: Atoms of Oxygen: 4CH3OH

Atoms of Carbon: Atoms of Hydrogen: Atoms of Oxygen: What about this? Ba(OH)2 H O

Ba O What does this mean? H PARENTHESES

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: Lets Practice

Ca3(PO4)2 Atoms of Calcium: Atoms of Phosphorus: Atoms of Oxygen: Al2(SO4)3 Atoms of Aluminum: Atoms of Sulfur: Atoms of Oxygen:

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

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