# Balancing: Oxygen and O2

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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