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Copy of Practice Quiz: Balancing (5/28/2026)
By Jason Poe
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Last updated about 2 hours ago
20 questions
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Question 1
1.
Count the number of each atom on each side of the equation below:
C
2
H
2
+ O
2
→ CO
2
+ H
2
O
Reactants: Products:
C _______ C_______
H _______ H_______
O _______ O_______
Question 2
2.
Question 3
3.
Count the number of each atom on each side of the equation below:
MnCl
2
+ Na
2
S → MnS + NaCl
Reactants: Products:
Mn _______ Mn _______
Cl _______ Cl _______
Na _______ Na _______
S _______ S _______
Question 4
4.
Question 5
5.
Count the number of each atom on each side of the equation below:
Zn + K
2
CrO
4
→ K + ZnCrO
4
Reactants Products
Zn _______ Zn_______
K _______ K _______
Cr _______ Cr _______
O _______ O _______
Question 6
6.
Question 7
7.
Count the number of each atom on each side of the equation below:
Al + CuSO
4
→ Al
2
(SO
4
)
3
+ Cu
Reactants Products
Al _______ Al _______
Cu _______ Cu _______
S _______ S_______
O _______ O _______
Question 8
8.
Which coefficient is used for Aluminum (Al) in the balanced equation on the reactant side? _______
Al + CuSO
4
→ Al
2
(SO
4
)
3
+ Cu
Question 9
9.
Question 10
10.
Question 11
11.
Question 12
12.
Question 13
13.
Question 14
14.
Question 15
15.
Question 16
16.
Question 17
17.
Question 18
18.
Question 19
19.
Count the number of each atom on each side of the equation below:
2 C
8
H
18
+ 25 O
2
→ 16 CO
2
+ 9 H
2
O
Reactants Products
C _______ C _______
H _______ H _______
O _______ O _______
What needs to be changed to make this balanced? _______
I have to regrade the last part.
Question 20
20.
Count the number of each atom on each side of the equation below:
C
6
H
12
O
2
+ 7 O
2
→ 2 CO
2
+ 6 H
2
O
Reactants Products
C _______ C _______
H _______ H _______
O _______ O _______
What needs to be changed to make this balanced? _______
I have to regrade the last part.
Which coefficients are required to correctly balance the equation:
C
2
H
2
+ O
2
→ CO
2
+ H
2
O
1, 2, 3, 2
2, 4, 5, 2
2, 5, 4, 2
2, 3, 5, 2
Which coefficients are required to correctly balance the equation:
MnCl
2
+ Na
2
S → MnS + NaCl
1, 1, 2, 2
1, 2, 2, 1
1, 2, 1, 1
1, 1, 1, 2
Which coefficients are required to correctly balance the equation:
Zn + K
2
CrO
4
→ K + ZnCrO
4
1, 2, 1, 2
2, 1, 2, 1
1, 2, 3, 1
1, 1, 2, 1
Which of the following equations is balanced?
CaBr
2
+ NaCO
3
→ CaCO
3
+ 2 NaBr
2 CH
4
+ O
2
→ CO
2
+ 2 H
2
O
CH
4
+ 2O
2
→ CO
2
+ 2 H
2
O
CaBr
2
+ NaCO
3
→ 2 CaCO
3
+ NaBr
CH
4
+ 2 O
2
→ 2 CO
2
+ H
2
O
3 CaBr
2
+ NaCO
3
→ 2 CaCO
3
+ 2 NaBr
Sulfur trioxide gas is produced when sulfur reacts with oxygen gas.
Which reaction best expresses the balanced reaction?
SO
3
(g) → 2 SO
2
(g) + O
2
(g)
2 SO
2
(g) + O
2
(g) → 2 SO
3
(g)
2 SO
3
(g) → 2 SO
2
(g) + O
2
(g)
2 SO
2
(g) → 2 SO
3
(g) + O
2
(g)
Which equations are balanced?
2H₂ + O₂ → 2H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
2Fe + 3O₂ → 2Fe₂O₃
H₂ + O₂ → 2H₂O
H₂ + O₂ → H₂O
Select the balanced chemical equations.
Ca + O₂ → CaO₂
3 N
2
+H
2
→ NH
3
2Na + Cl → NaCl₂
4Fe + 3O₂ → 2Fe₂O₃
Na + Cl₂ → 2NaCl
Identify the balanced equations below.
4C + 5O₂ → 4CO₂
Ca + 2H₂O → Ca(OH)₂ + H₂
2N₂ + 3H₂ → NH₃
N₂ + 3H₂ → 2NH₃
C
2
H
5
OH + 2 O
2
→ 2 CO
2
+ H
2
O
Which chemical equations are correctly balanced?
H
2
+ O
2
→ H
2
O
2K + Cl₂ → 2KCl
2Al + 3Cl₂ → 2AlCl₃
3H₂ + O₂ → 2H₂O
K + Cl → KCl₂
Balance: C
3
H
8
+ O
2
→ CO
2
+ H
2
O. What coefficients?
1, 2, 1, 2
1, 5, 3, 4
3, 1, 3, 1
Balance: N
2
+ H
2
→ NH
3
. What coefficients?
1, 1, 1
2, 1, 2
1, 3, 2
Balance: Fe + O
2
→ Fe
2
O
3
. What coefficients?
2, 3, 2
1, 1, 1
4, 3, 2
Balance: C
4
H
10
+ O
2
→ CO
2
+ H
2
O. What coefficients?
1, 5, 3, 4
2, 13, 8, 10
2, 5, 3, 4