. 9/26/11 62 Counting Atoms 10/15/2013 61 Counting Atoms 10/15/2013 Starter: How many elements are in the following compounds : H2O, NaCl, Cl2 Application.

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Presentation transcript:

. 9/26/11 62 Counting Atoms 10/15/ Counting Atoms 10/15/2013 Starter: How many elements are in the following compounds : H2O, NaCl, Cl2 Application How many atoms 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. Practice: SubscriptCoefficients example

October 15, 2013 AGENDA 8.5 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 (H 2 PO 4 ) 2 H2OH2O NaCl C2H4O2C2H4O2

DateLecture/ Activity/ Lab Page 9/25 Metal, Nonmetals, and Metalloids /26 Where’s Al? /27 Element Wanted Poster /30 Bohr Model Challenge /1 Periodic Table Notes/Puzzles /2 Periodic Table Chart /3 Test Review /8 Test Corrections /9 Molecules, Compounds, and Elements /10 Build a Molecule Activity /15 Counting Atoms Table of Contents

Coefficients and Subscripts 6H 2 O + 6CO 2 C 6 H 12 O 6 + 6O 2 Water + Carbon Dioxide Sugar + Oxygen

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

Subscripts small numbers behind the element symbol Show how atoms of an element there are. 6H 2 O + 6CO 2 C 6 H 12 O 6 + 6O 2 2 hydrogen atoms 6 carbon atoms

Subscripts Subscripts show the number of atoms H2H2 H4H4 H3H3

Coefficients are added to the front of a formula show how many molecules of the compound there are 6H 2 O + 6CO 2 C 6 H 12 O 6 + 6O 2 6 water molecules 6 Oxygen molecules

Coefficients Coefficients show the number of molecules. 4H 2 O 2H 2 O 3H 2 O

How Many Atoms? NaCl Fe 2 O sodium 1 chlorine 5 2 Iron 3 oxygen

How Many Atoms? H 3 PO 4 NaC 2 H 3 O 3 3 hydrogen 1 phosphorus 4 oxygen 8 1 sodium 2 carbon 3 hydrogen 3 oxygen 9

How Many Atoms? (CH 3 ) 2 CO 3 Carbon 6 Hydrogen 1 Oxygen 10

Add on back of sheet H 2 SO 4 Ca(PO 4 ) 2 HCl CaCO 3 C 2 H 4 O 2

. 9/26/11 62 Counting Atoms 10/15/ Counting Atoms 10/15/2013 Starter: How many elements are in the following compounds : H2O, NaCl, Cl2 Application How many atoms 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. Practice: SubscriptCoefficients example