Copy of Practice Quiz: Balancing (5/28/2026)

2

Count the number of each atom on each side of the equation below:

C₂H₂ + O₂ → CO₂ + H₂O

Reactants: Products:

C C

H H

O O

1

Which coefficients are required to correctly balance the equation:
C₂H₂ + O₂ → CO₂ + H₂O

1, 2, 3, 2

2, 4, 5, 2

2, 5, 4, 2

2, 3, 5, 2

2

Count the number of each atom on each side of the equation below:

MnCl₂ + Na₂S → MnS + NaCl

Reactants: Products:

Mn Mn

Cl Cl

Na Na

S S

1

Which coefficients are required to correctly balance the equation:
MnCl₂ + Na₂S → MnS + NaCl

1, 1, 2, 2

1, 2, 2, 1

1, 2, 1, 1

1, 1, 1, 2

2

Count the number of each atom on each side of the equation below:

Zn + K₂CrO₄ → K + ZnCrO₄

Reactants Products

Zn Zn

K K

Cr Cr

O O

1

Which coefficients are required to correctly balance the equation:
Zn + K₂CrO₄ → K + ZnCrO₄

1, 2, 1, 2

2, 1, 2, 1

1, 2, 3, 1

1, 1, 2, 1

2

Count the number of each atom on each side of the equation below:

Al + CuSO₄ → Al₂(SO₄)₃ + Cu

Reactants Products

Al Al

Cu Cu

S S

O O

1

Which coefficient is used for Aluminum (Al) in the balanced equation on the reactant side?

Al + CuSO₄ → Al₂(SO₄)₃ + Cu

1

Which of the following equations is balanced?

CaBr₂ + NaCO₃→ CaCO₃ + 2 NaBr

2 CH₄ + O₂ → CO₂ + 2 H₂O

CH₄ + 2O₂ → CO₂+ 2 H₂O

CaBr₂+ NaCO₃ → 2 CaCO₃ + NaBr

CH₄ + 2 O₂ → 2 CO₂ + H₂O

3 CaBr₂ + NaCO₃ → 2 CaCO₃ + 2 NaBr

1

Sulfur trioxide gas is produced when sulfur reacts with oxygen gas.
Which reaction best expresses the balanced reaction?

SO₃(g) → 2 SO₂(g) + O₂(g)

2 SO₂(g) + O₂(g) → 2 SO₃(g)

2 SO₃(g) → 2 SO₂(g) + O₂(g)

2 SO₂(g) → 2 SO₃(g) + O₂(g)

1

Which equations are balanced?

1

Select the balanced chemical equations.

1

Identify the balanced equations below.

1

Which chemical equations are correctly balanced?

1

Balance: C₃H₈ + O₂ → CO₂ + H₂O. What coefficients?

1, 2, 1, 2

1, 5, 3, 4

3, 1, 3, 1

1

Balance: N₂ + H₂ → NH₃. What coefficients?

1, 1, 1

2, 1, 2

1, 3, 2

1

Balance: Fe + O₂ → Fe₂O₃. What coefficients?

2, 3, 2

1, 1, 1

4, 3, 2

1

Balance: C₄H₁₀ + O₂ → CO₂ + H₂O. What coefficients?

1, 5, 3, 4

2, 13, 8, 10

2, 5, 3, 4

3

Count the number of each atom on each side of the equation below:

2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 9 H₂O

Reactants Products

C C

H H

O O

What needs to be changed to make this balanced?

I have to regrade the last part.

3

Count the number of each atom on each side of the equation below:

C₆H₁₂O₂ + 7 O₂ → 2 CO₂ + 6 H₂O

Reactants Products

C C

H H

O O

What needs to be changed to make this balanced?

I have to regrade the last part.

Copy of Practice Quiz: Balancing (5/28/2026)

Which coefficients are required to correctly balance the equation:C2H2 + O2 → CO2 + H2O

Which coefficients are required to correctly balance the equation:MnCl2 + Na2S → MnS + NaCl

Which coefficients are required to correctly balance the equation:Zn + K2CrO4 → K + ZnCrO4

Which of the following equations is balanced?

Sulfur trioxide gas is produced when sulfur reacts with oxygen gas.Which reaction best expresses the balanced reaction?

Which equations are balanced?

Select the balanced chemical equations.

Identify the balanced equations below.

Which chemical equations are correctly balanced?

Balance: C3H8 + O2 → CO2 + H2O. What coefficients?

Balance: N2 + H2 → NH3. What coefficients?

Balance: Fe + O2 → Fe2O3. What coefficients?

Balance: C4H10 + O2 → CO2 + H2O. What coefficients?

Which coefficients are required to correctly balance the equation:C2H2 + O2 → CO2 + H2O

Which coefficients are required to correctly balance the equation:MnCl2 + Na2S → MnS + NaCl

Which coefficients are required to correctly balance the equation:Zn + K2CrO4 → K + ZnCrO4

Which of the following equations is balanced?

Sulfur trioxide gas is produced when sulfur reacts with oxygen gas.Which reaction best expresses the balanced reaction?

Which equations are balanced?

Select the balanced chemical equations.

Identify the balanced equations below.

Which chemical equations are correctly balanced?

Balance: C3H8 + O2 → CO2 + H2O. What coefficients?

Balance: N2 + H2 → NH3. What coefficients?

Balance: Fe + O2 → Fe2O3. What coefficients?

Balance: C4H10 + O2 → CO2 + H2O. What coefficients?

Which coefficients are required to correctly balance the equation:
C₂H₂ + O₂ → CO₂ + H₂O

Which coefficients are required to correctly balance the equation:
MnCl₂ + Na₂S → MnS + NaCl

Which coefficients are required to correctly balance the equation:
Zn + K₂CrO₄ → K + ZnCrO₄

Sulfur trioxide gas is produced when sulfur reacts with oxygen gas.
Which reaction best expresses the balanced reaction?

Balance: C₃H₈ + O₂ → CO₂ + H₂O. What coefficients?

Balance: N₂ + H₂ → NH₃. What coefficients?

Balance: Fe + O₂ → Fe₂O₃. What coefficients?

Balance: C₄H₁₀ + O₂ → CO₂ + H₂O. What coefficients?

Which coefficients are required to correctly balance the equation:
C₂H₂ + O₂ → CO₂ + H₂O

Which coefficients are required to correctly balance the equation:
MnCl₂ + Na₂S → MnS + NaCl

Which coefficients are required to correctly balance the equation:
Zn + K₂CrO₄ → K + ZnCrO₄

Sulfur trioxide gas is produced when sulfur reacts with oxygen gas.
Which reaction best expresses the balanced reaction?

Balance: C₃H₈ + O₂ → CO₂ + H₂O. What coefficients?

Balance: N₂ + H₂ → NH₃. What coefficients?

Balance: Fe + O₂ → Fe₂O₃. What coefficients?

Balance: C₄H₁₀ + O₂ → CO₂ + H₂O. What coefficients?