1. Law of Conservation of Mass and Chemical Equations
Do now: Grab sheet from Front desk
Do Part A. “Review Time-counting atoms” on your own

2. Review Time 2HCl H-2 Cl-2 C2H6 C-2 H-6 2MgO Mg-2 O-2
3Al(OH)3 Al-3 O-9 H-9
P4O10 P-4 O-10
H2O2 H-2 O-2

3. New Stuff
The Law of Conservation of Mass states that atoms are not created or destroyed during a chemical reaction.
They can only be rearranged into new substance.
A chemical equation is a shorthand way to represent your chemical reaction
Chemical reaction is where two or more substances break and make new bonds to make a new substance with new properties

4. New Stuff Subscript- how many of each atom
Coefficient- how many of each molecule
Reactants- Substances you are chemically combining to make new substances with new properties
Products- substances you are making through the chemical reaction

5. New Stuff
In a chemical equation, you must show that the Law of Conservation are Mass is being followed. This means:
You have the same number of atoms for each element on each side of the equation
You use coefficients to show that the equation is balanced
You CANNOT change subscripts because that changes the substances you working with

6. New Stuff Na3PO4 + 3KOH  3NaOH + K3PO4 Na=3 P=1 K=3 H= 3 O=7 Na= 3
To do this, you need to look at the entire formula and count how many atoms you have of each element on each side and then compare them
Na3PO4 + 3KOH  3NaOH + K3PO4
Na=3
P=1
K=3
H= 3
O=7
Na= 3
P=1
K=3
H=3
O=7
BALANCED!

7. New Stuff MgF2 + Li2CO3  MgCO3 + LiF Mg= 1 Li= 1 O= 3 F= 1 C= 1 Mg= 1
NOT BALANCED!