CW: LAW OF CONSERVATION OF MATTER
PART I: Standard Deviants ~ CHEMICAL REACTIONS
BEFORE VIEWING THE MOVIE:
1) Write what you think the “Law of Conservation of Matter” means
WHILE VIEWING THE MOVIE:
USE THE WORD BANK BELOW TO LABEL THE PARTS
PRODUCT
YIELDS
SUBSCRIPT
REACTANT
COEFFICIENT
CH4 + 2O2  CO2 + 2H2O
USE THE CHART BELOW TO FILL IN THE EXAMPLE FROM THE VIDEO
CH4 + 2O2
Number of atoms on reactant
side

ELEMENTS
CO2 + 2H2O
Number of atoms on products
side
CARBON (C)
HYDROGEN (H)
OXYGEN (O)

TOTAL ATOMS:
PART II: BALANCED OR UNBALANCED CHEMICAL EQUATIONS
The LAW OF CONSERVATION OF MATTER states: in a chemical reaction, matter
cannot be created or destroyed, it can only be rearranged.
WHICH MEANS: In a chemical reaction, that mass of the reactants IS THE SAME
as the mass of the products
WHICH MEANS: In a chemical reaction the number and type of atoms you start
(reactants) MUST equal the number and type of atoms you end up with
(products).
USE THIS INFORMATION TO DETERMINE WHETHER EACH EQUATION IS
BALANCED OR UNBALANCED (NEXT PAGE)
BALANCED OR UNBALANCED CHEMICAL EQUATIONS
PRACTICE: Decide if the following chemical equations are balanced or unbalanced
Ca + O2
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
CaO
Number of atoms on products side

THE EQUATION IS: ___________________________
2 Mg + CO2
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
2 MgO + C
Number of atoms on products side

THE EQUATION IS: ___________________________
Al2O3 + 3 H2
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
2 Al + 3 H2O
Number of atoms on products side

THE EQUATION IS: ___________________________
Cu(NO3)2 + H2S
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
CuS + HNO3
Number of atoms on products side

THE EQUATION IS: ___________________________
BALANCED OR UNBALANCED CHEMICAL EQUATIONS
PRACTICE: Decide if the following chemical equations are balanced or unbalanced
Mg + 2 HCl
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
MgCl2 + H2
Number of atoms on products side

THE EQUATION IS: ___________________________
Fe + HCl
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
FeCl2 + H2
Number of atoms on products side

THE EQUATION IS: ___________________________
CaO + H2O
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
Ca (OH)2
Number of atoms on products side

THE EQUATION IS: ___________________________
KClO3 + 3 Na2SnO2
Number of atoms on reactant side
TOTAL ATOMS:

ELEMENTS
KCl + 3 Na2SnO3
Number of atoms on products side

THE EQUATION IS: ___________________________