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61. 62. Counting Atoms. Counting Atoms. 9/26/11. 10/15/2013. 10/15/2013. A pplication How many atoms 1. 2. 3. 4. 5. Connection: Counting Atoms Ws Exit: How does a chemical formula help us know what atoms are in a compound? Explain in 2-3 complete sentences. Starter:

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9/26/11

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  1. 61 62 Counting Atoms Counting Atoms 9/26/11 10/15/2013 10/15/2013 . • Application • How many atoms • 1. • 2. • 3. • 4. • 5. • Connection: • Counting Atoms Ws • Exit: • How does a chemical formula help us know what atoms are in a compound? Explain in 2-3 complete sentences. . Starter: How many elements are in the following compounds: H2O, NaCl, Cl2 . Practice:

  2. October 15, 2013AGENDA8.5 D.I will be able to recognize that chemical formulas identify substances and used to determine the number of atoms of each element in chemical formulas by reading, and writing while completing notes and activity 1 Starter 2. Notes 3. Activity 4. Exit Ca (H2PO4)2 H2O NaCl C2H4O2

  3. Table of Contents Date Lecture/ Activity/ Lab Page 9/25 Metal, Nonmetals, and Metalloids 41-42 9/26 Where’s Al? 43-44 9/27 Element Wanted Poster 45-46 9/30 Bohr Model Challenge 47-48 10/1 Periodic Table Notes/Puzzles 49-50 10/2 Periodic Table Chart 51-52 10/3 Test Review 53-54 10/8 Test Corrections 55-56 10/9 Molecules, Compounds, and Elements 57-58 10/10 Build a Molecule Activity 59-60 10/15 Counting Atoms 61-62

  4. Coefficients and Subscripts 6H2O + 6CO2C6H12O6+ 6O2 Water + Carbon Dioxide Sugar + Oxygen

  5. Why Do We Use Chemical Formulas and Equations? Scientists use equations to show: • how a chemical reaction took place • what elements were involved • what was produced from the reaction

  6. Subscripts • small numbers behind the element symbol • Show how atoms of an elementthere are. 6H2O+ 6CO2C6H12O6+ 6O2 6 carbon atoms 2 hydrogen atoms

  7. H2 H4 H3 Subscripts • Subscripts show the number of atoms

  8. 6 Oxygen molecules 6 water molecules Coefficients • are added to the front of a formula • show how many molecules of the compound there are 6H2O + 6CO2C6H12O6+6O2

  9. 4H2O 3H2O 2H2O Coefficients Coefficients show the number of molecules.

  10. How Many Atoms? 1 sodium 1 chlorine 2 • NaCl • Fe2O3 2 Iron 3 oxygen 5

  11. How Many Atoms? • H3 PO4 • NaC2H3O3 3 hydrogen 1 phosphorus 4 oxygen 8 1 sodium 2 carbon 3 hydrogen 3 oxygen 9

  12. How Many Atoms? • (CH3)2 CO 3 Carbon 6 Hydrogen 1 Oxygen 10

  13. Add on back of sheet

  14. 61 62 Counting Atoms Counting Atoms 9/26/11 10/15/2013 10/15/2013 . • Application • How many atoms • 1. • 2. • 3. • 4. • 5. • Connection: • Counting Atoms Ws • Exit: • How does a chemical formula help us know what atoms are in a compound? Explain in 2-3 complete sentences. . Starter: How many elements are in the following compounds: H2O, NaCl, Cl2 . Practice:

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