Free Printable Balancing Redox Equations

1.

Which of the following reactions is balanced by both mass and charge?

a)

Fe⁺² + Al →Fe + Al⁺³

b)

Cu + Fe⁺² → Cu⁺¹ + Fe⁺³

c)

F₂ + Br^- --> F^- + Br₂

d)

Fe⁺² + 2 Cu --> 2 Cu⁺ + Fe

2.

Which of the following is the balanced half -reaction for the oxidation of Cu to Cu^+2?

a)

Cu --> Cu⁺²

b)

Cu + 2 e- --> Cu⁺²

c)

Cu --> Cu⁺²+ 2 e-

d)

Cu - 2e- --> Cu⁺²

3.

What are α and β and γ?

NO₃^- + α H⁺ + β e^- → NO + γ H₂O

a)

α = 2 β = 3 γ = 4

b)

α = 2 β = 2 γ = 2

c)

α = 4 β = 4 γ = 3

d)

α = 4 β = 3 γ = 2

4.

Which of these equations represents a redox reaction?

a)

Ca(HCO₃)_{2 -->}CaCO₃ + H₂O + CO₂

b)

HC₂H₃O₂ + NaOH --> NaC₂H₃O₂ + H₂O

c)

Zn + 2FeCl₃ --> ZnCl₂ + 2FeCl₂

d)

NaCl + AgNO_{3 -->}AgCl + NaNO₃

5.

Which element is being oxidized in the following chemical reaction?

2KMnO₄+ 5KNO₂ + 3H₂SO₄-->2MnSO₄ + 3H₂O + 5KNO₃ + K₂SO₄

a)

S

b)

Mn

c)

O

d)

N

6.

Which element is reduced in the following reaction?

2K₂Cr₂O₇ + 2H₂O + 3S --> 3SO₂ + 4KOH + 2Cr₂O₃

a)

K

b)

Cr

c)

O

d)

S

7.

What is the oxidation half-reaction for the following redox reaction?
Zn + HgO $\longrightarrow$ ZnO + Hg

a)

Zn $\longrightarrow$ Zn2+ + 2e–

b)

Hg2+ + 2e– $\longrightarrow$ Hg

c)

Zn + HgO

d)

ZnO + Hg

8.

What is the reduction half-reaction for the following redox reaction?
Zn + HgO $\longrightarrow$ ZnO + Hg

a)

Zn $\longrightarrow$ Zn2+ 2e–

b)

Hg2+ + 2e– $\longrightarrow$ Hg

c)

Zn + HgO

d)

ZnO + Hg

9.

When an element undergoes combustion and loses electrons, the element is

a)

oxidized

b)

reduced

c)

neutralized

d)

dissolved

10.

In the reaction
2Ca(s) + O₂(g) → 2CaO(s), calcium is...

a)

Reduced

b)

Synthesized

c)

Oxidized

d)

None of the above

11.

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:

Balance the following reactions using the half-reaction method.

MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s)

How many electrons did you cross out on both side?

a)

1 e^-

b)

2 e^-

c)

5 e^-

d)

10 e^-

12.

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:

Balance the following ACIDIC reactions using the half-reaction method.

MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s)

Water is a product of this reaction. What is the coefficient of water in the final balanced equation?

a)

8

b)

5

c)

2

d)

16

13.

$MnO^-+C_2O_4^{2^-}=CO_2+MnO_2$
How many electrons are being transferred in Mn half reaction?

(a)

14.

$Mn^{2^+}+BiO^{3^-}\rightarrow MnO^{4^-}+Bi^{3^+}$
How many electrons are transferred in the Mn half reaction?

(a)

Balancing Redox Equations

Total questions: 14

Worksheet time: 1hrs 24mins

Similar Resources on Wayground