1. Do Now: Copy the following notes into your student page.
Use the pencils at your desk to shade the periods on the periodic table.
Use the pencils at your desk to shade the groups on the periodic table.
Periods
Groups
Horizontal Rows
Vertical Columns
Number of Energy Levels
Number of Valence Electrons
Chemical Reactivity Similar
Chemical Properties Similar

2. Today’s Schedule Do-Now Egg-stracting the Elements Counting Atoms
Formula Practice Dry Erase Boards
Reflecting on STAAR
Objectives:
Today we will…
8.5 (D) Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts.
Dark Matter

3. Work with a partner and use your periodic table to complete the table.

4. Review: How to make a molecule…
Formula
Visual model
H2O
Subscript
No Subscript,
There is only 1
atom of oxygen in
the molecule

5. Explore: Eggs-tracting the Elements
Count the atoms in each molecule.
Record on your answer page.
Voice level 2
Time= 15 minutes.
Label the periodic table with groups and periods 2 1 4
H2SO4

6. Elements/ Number of Atoms
Explain: Chemical Formulas, page 27
Make a table like this in your INB.
Compound Name
Chemical Formula
Elements/ Number of Atoms
Total Number of Atoms
Label the periodic table with groups and periods

8. The model above is best represented by:
H2O
2OH
HOOH
H2O2

9. The above model shows:
10 atoms
2 molecules
2CH3Cl
All of the above

21. Reflecting on STAAR What I know really well… 1. 2. 3. 4.
What I still need help with… 1. 2. 3. 4.

22. Today’s Schedule Do-Now Egg-stracting the Elements Counting Atoms
Formula Practice Dry Erase Boards
Reflecting on STAAR
Objectives:
Today we will…
8.5 (D) Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts.
Dark Matter