Balancing: Oxygen and O2

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Chemical Equations

Name _____________________________

Balancing
Balancing Equations Challenge
Part A: Parts & Pieces
(1) Circle each subscript in each chemical formula.
(2) Draw a square around each coefficient.
(3) Answer the questions related to each chemical formula.

O2

CO2

5 H2

What element does the O represent?
___________________

How many atoms of each element
are in the formula shown?
C = ______ O = ______

How many atoms of Hydrogen are
in this formula as shown?
______

2C2H6

2Na2SO4

How many atoms each element
are in the formula shown?
C = ______ H = ______

How many atoms each element
are in the formula shown?
Na = ______ S = ______ O = ______

Part B: Label the chemical equation using PRODUCT, REACTANTS, SUBSCRIPT, COEFFICIENT, and YIELDS.

2 Mg + O2
T. Trimpe 2006

→ 2 MgO
http://sciencespot.net/

Part C: Balance each of the following equations.

H2 +

O2 →

H2O

N2 +

H2 →

NH3

Al2 O3 →

C2 H6 +

O2

Al



Remember → List the atoms, count, and solve!

H2O2 →

P4 +

+

CO2

O2 →

O2

+

H2O + O2

P4O6

Fe +

H2O

T. Trimpe 2006

Na2SO4 +

http://sciencespot.net/

Na + O2

C+

H2O →

CaCl2 →



H2 →

Fe3O4 +

CaSO4 +

Na2O

CH4

H2

NaCl

Answer Key

Balancing
Balancing Equations Challenge
Part A: Parts & Pieces
(1) Circle each subscript in each chemical formula.
(2) Draw a square around each coefficient.
(3) Answer the questions related to each chemical formula.

O2

CO2

5 H2

What element does the O represent?
OXYGEN

How many atoms of each element
are in the formula shown?
C=1 O=2

How many atoms of Hydrogen are
in this formula as shown? 10

2C2H6

2Na2SO4

How many atoms each element
are in the formula shown?
C = 4 H = 12

How many atoms each element
are in the formula shown?
Na = 4 S = 2 O = _8

Part B: Label the chemical equation using PRODUCT, REACTANTS, SUBSCRIPT, COEFFICIENT, and YIELDS. YIELDS
REACTANTS

PRODUCT

2 Mg + O2
SUBSCRIPT

T. Trimpe 2006

→ 2 MgO
COEFFICIENT

http://sciencespot.net/

Part C: Balance each of the following equations.

2H2 +

O2 →

2H2O

N2 +

3H2 →

2NH3

2Al2 O3 →

4Al

Remember → List the atoms, count, and solve!

2H2O2 →

P4 + 3O2

+

3O2

2C2 H6 + 7O2 → 4CO2 +

2H2O + O2



P4O6

4Na +

O2 →

C + 2H2



3Fe +

6H2O

T. Trimpe 2006

4H2O →

Fe3O4 +

Na2SO4 +

CaCl2 →

CaSO4 +

http://sciencespot.net/

2Na2O

CH4

4H2

2NaCl

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