1. You Will Need:
1. Counting Total Atoms– 2 pages
4 sides – Due NOW
2. Log #4 (Update on-line)
3. Pencil, Periodic Table (pgs. 196-
197), Colored Pencils
5. Balancing Equations - 2 pages 4
sides (Bookshelf- Please Staple)
6. Today is the End of Quarter #3
…last day to turn in any work for
this period of time.

2. Last Day to:
1.Retake Test #2
2.Retake Quiz #1 – STAR Cards
1-30
3.Turn in any missing work for
this quarter

3. Balancing a chemical equations is
much like the work of an
accountant who has to show
where every penny has come
from and where it has gone to.

4. Vocabulary Definition
Word
Catalysts Starts and/or Speeds Up
Chemical Reactions
Inhibitors Stops and/or Slows Down
Chemical Reactions

5. Word Definition
Conservation Mass (particles) can neither be created
of Mass or destroyed in any chemical reaction
Reactants
Products
Coefficient

6. 2 NaOH + H2SO4 Na2SO4 + 2 H2O
Conservation of Mass = the same number
of atoms of each element on each side of
the equation.

7. Word Definition
Conservation Mass can neither be created or
of Mass destroyed in any chemical reaction.
Reactants
Substances going into the reaction.
Products
Coefficient

8. 2 NaOH + H2SO4 Na2SO4 + 2 H2O
Reactants = the substances going into a
reaction

9. Word Definition
Conservation Mass can neither be created or
of Mass destroyed in any chemical reaction.
Reactants
Substances going into the reaction.
Products Substances produced by the
reaction
Coefficient

10. 2 NaOH + H2SO4 Na2SO4 + 2 H2O
Products = the substances being
produced by the reaction

11. Word Definition
Conservation Mass can neither be created or
of Mass destroyed in any chemical reaction.
Reactants
Substances going into the reaction.
Products Substances produced by the
reaction
Coefficient The number in front of the formula
indicating how many molecules

12. 2 NaOH + H2SO4 Na2SO4 + 2 H2O
Coefficient = The number in front of each
formula or element indicating how many
molecules

13. The Law of Conservation of Mass states
that mass is neither created or destroyed
in any chemical reaction.
Therefore balancing of equations
requires the same number of atoms on
both sides of a chemical reaction.

14. 1. Get Yourself an unbalanced equation.
NaOH + H2SO4 Na2SO4 + H2O

15. 1. Get Yourself an unbalanced equation.
2. Draw boxes around all the chemical
formulas.
NaOH + H2SO4 Na2SO4 + H2O

16. 3. Make an element inventory.
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Na=Sodium 1 2
O= Oxygen 5 5
H= Hydrogen 3 2
S= Sulfur 1 1

17. 4. Write the numbers in front of each of the boxes until
the inventory for each element is the same both
before and after the reaction.
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Sodium 1 2
Oxygen 5 5
Hydrogen 3 2
Sulfur 1 1

18. 4. Write the numbers in front of each of the boxes until
the inventory for each element is the same both
before and after the reaction.
2
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Na 1 2 2
O 5 6 5
H 3 4 2
S 1 1

19. 4. Write the numbers in front of each of the boxes until
the inventory for each element is the same both
before and after the reaction.
2
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Na 2 2
O 6 5
H 4 2
S 1 1

20. 4. Write the numbers in front of each of the boxes until
the inventory for each element is the same both
before and after the reaction.
2 2
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Na 2 2
O 6 5 6
H 4 2 4
S 1 1

21. •You have 10 problems to balance…
Due Tomorrow
•# 6 on the last page – Start with the
(SCN)3 components
•Do TWO and get them checked before
you complete them all.
•Ask questions when you don’t
understand

22. HOMEWORK:
1. Balancing Equations – Due
Tomorrow
2. STAR CARDS #31-60 – Due Friday
3. Check your updated grades for
accuracy ….Last day of the Quarter
is Today.