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Counting Atoms

Learn the fundamentals of counting atoms in compounds, including atomic structure, subscripts, coefficients, and multiplying atoms in parentheses. Practice exercises included.

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Counting Atoms

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  1. Counting Atoms

  2. DO NOW: • Complete SCOPES Day 1

  3. Building block of matter. Has a nucleus surrounded by the electron cloud. Made up of only one kind of atom. Smallest particle of a substance that still has properties of that substance. The number of atoms in a molecule Number in front of a formula, Changes the amount, not the identity of a substance

  4. You have until the end of my AWESOME song to cut out the two papers. https://www.youtube.com/watch?v=B0d-fzj9oMQ&list=RDB0d-fzj9oMQ&t=22

  5. When a subscript is outside the parentheses, then every element inside the parenthesis needs to be MULTIPLIED by the subscript outside. Mg – 1 atom O – 2 atoms H – 2 atoms When no subscripts are present it is implied that each element only has 1 atom. C = 1 atom of Carbon A subscript is the small number to the right of an element. When a subscript exists, the previous element has that many atoms. CO₂ C – 1 atom O – 2 atoms Total = 3 atoms A coefficient is placed in front of a compound. When a coefficient is present, then the coefficient needs to be MULTIPLIED to every subscript within the compound. O – 6 atoms H – 6 atoms O C C O

  6. 1 P - 1 S – 1 O - 4 2 O - 6 1 H – 3 P – 1 O - 4 3 Zn – 2 O – 4 H - 4 3 Na – 2 Si – 1 O - 3 3 Mg – 1 N – 2 O - 6 3 Ba – 3 P – 2 O - 8 3

  7. Time to practice on your own!

  8. 4NH3 6N H2O2

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