53
Counting Atoms
9/26/11
.
10/06/2015
EQ: How does the structure
of matter explain its
.
properties and the changes it
under goes?
Starter:
How many elements are in
the following compounds:
H2O, NaCl, Cl2
Practice:
Counting Atoms
Application
How many atoms
1.
2.
3.
4.
5.
Connection:
Counting Atoms Ws
54
10/06/15
Subscript
Coefficients
1.
1.
Exit:
2.
2.
3.
3.
example
example
How does a chemical formula help
us know what atoms are in a
compound? Explain in 2-3 complete
sentences.
October 06, 2015
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
NaCl
C2H4O2
Table of Contents
Date
Lecture/ Activity/ Lab
9/15 Periodic Basics II/Groups and Periods
9/16
Metals, Nonmetals, and Metalliods
9/17
Comparing Elements Lab
9/18 Retest/Periodic table Graphic Organizer
9/21
Coloring the periodic table
9/22
Periodic Puzzles
9/24
Bohr Model Challenge
9/25
Wheres Al
9/28 Six weeks Exam Review
9/30-10/1
10/2
10/05
10/6
Element Wanted Poster
Molecules, Compounds, and Elements
Build a Molecule Activity
Counting Atoms
Page
29-30
31-32
33-34
35-36
37-38
39-40
41-42
43-44
45-46
47-48
49-50
51-52
53-54
Coefficients and
Subscripts
6H2O + 6CO2
Water + Carbon Dioxide
C6H12O6+ 6O2
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.
6H2O + 6CO2
2 hydrogen atoms
C6H12O6+ 6O2
6 carbon atoms
Subscripts
• Subscripts show the number
of atoms
H2
H4
H3
Coefficients
• are added to the front of a formula
• show how many molecules of the
compound there are
6 water molecules
6H2O + 6CO2
6 Oxygen molecules
C6H12O6+ 6O2
Coefficients
Coefficients show the
number of molecules.
4H2O
3H2O
2H2O
How Many Atoms?
• NaCl
1 sodium
• Fe2O3
2 Iron
1 chlorine
3 oxygen
2
5
How Many Atoms?
• H3 PO4
3 hydrogen
1 phosphorus
4 oxygen
• NaC2H3O3
1 sodium
2 carbon
3 hydrogen
3 oxygen
8
9
How Many Atoms?
• (CH3)2 CO
3 Carbon
6 Hydrogen
1 Oxygen
10
53
Counting Atoms
9/26/11
.
10/06/2015
EQ: How does the structure
of matter explain its
.
properties and the changes it
under goes?
Starter:
How many elements are in
the following compounds:
H2O, NaCl, Cl2
Practice:
Counting Atoms
Application
How many atoms
1.
2.
3.
4.
5.
Connection:
Counting Atoms Ws
54
10/06/15
Subscript
Coefficients
1.
1.
Exit:
2.
2.
3.
3.
example
example
How does a chemical formula help
us know what atoms are in a
compound? Explain in 2-3 complete
sentences.