Balancing Redox Reactions

What coefficient would Fe⁺² have in the following reaction?
___ Al + ___ Fe⁺² → ___ Al⁺³ + ___ Fe

• 1
• 2
• 3
• 6

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

• Fe⁺² + Al →Fe + Al⁺³
• Cu + Fe⁺² → Cu⁺¹ + Fe⁺³
• F₂ + Br^- --> F^- + Br₂
• Fe⁺² + 2 Cu --> 2 Cu⁺ + Fe

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

• Cu   --> Cu⁺²
• Cu + 2 e-   --> Cu⁺²
• Cu  --> Cu⁺²  + 2 e-
• Cu - 2e-  --> Cu⁺²

• Zn    +    HgO

• ZnO     +     Hg

Which is the correct net ionic equation for the reaction of AgNO₃ and CaCl₂?

• Ca²⁺(aq) +  2Cl^- (aq) → CaCl(s)
• Ag⁺(aq)  +  Cl^- (aq) → AgCl(s)
• Ag +  Cl  →  AgCl
• Ag⁺  +  Ca²⁺   →Ag₂Ca (s)

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-
• Pb⁴⁺ + 2e^- →Pb²⁺
• 2O^-2 →O₂ + 4e^-
• Fe + 3e^- →Fe³⁺

Balance the following redox equations for reactions that occur in neutral solution:

Zn + Ag+ → Zn²⁺ + Ag

•   Zn + 2Ag⁺ →  Zn²⁺ + 2Ag

    

• Zn + Ag⁺ →  Zn²⁺ + Ag

•   Zn + 2Ag⁺ → Zn²⁺ + Ag

• Zn+ Ag⁺ → 2 Zn²⁺ + 2Ag

Balance the following redox equations for reactions that occur in neutral solution:

Fe³⁺ + I⁻ → Fe²⁺ + I_2. :

• Fe³⁺ + 2I⁻ →  Fe²⁺ + 2I₂

• Fe³⁺ +  I⁻ →  Fe²⁺ + I₂

• 2Fe³⁺ + I⁻ →  2Fe²⁺ + I₂

• 2Fe³⁺ + 2I⁻ →  2Fe²⁺ + I₂

Balance the following half-equations for reactions that occur in acidic solution:

BrO₃⁻ + I⁻ → Br₂ + I₂

• 2BrO₃⁻ + 10I⁻ + 6H⁺ → Br₂ + 5I₂ + 3H₂O

• 2BrO₃⁻ + 10I⁻ + 12H⁺ → Br₂ + 5I₂ + 6H₂O

• BrO₃⁻ + 10I⁻ + 14H⁺ → Br₂ + 5I₂ + 7H₂O

• BrO₃⁻ + 5I⁻ + 12H⁺ → Br₂ + 3I₂ + 6H₂O

Explain the concept of adding H+ and H2O to balance redox equations in acidic solutions.

• Multiply H+ and H2O to balance the equation in acidic solutions.

• Subtract H+ and H2O to balance the equation in acidic solutions.

• Divide H+ and H2O to balance the equation in acidic solutions.

• Add H+ and H2O to balance the equation in acidic solutions.