11-02: Half Reactions

Which process can be represented by a half-reaction equation?

• distillation

• oxidation

• sublimation

• vaporization

Tags

NGSS.HS-PS1-7

Which equation represents a reduction half-reaction?

• Fe → Fe³⁺ + 3e^-

• Fe + 3e^- → Fe³⁺

• Fe³⁺ → Fe + 3e^-

• Fe³⁺ + 3e^- → Fe

Which half-reaction equation represents reduction?

• Cu → Cu²⁺ + 2e^-

• Cu²⁺ + 2e^- → Cu

• Ag + e^- → Ag⁺

• Ag⁺ → Ag + e^-

Given the equation representing a reaction:

Cd + NiO₂ + 2H₂O → Cd(OH)₂ + Ni(OH)₂

Which half-reaction equation represents the oxidation in the reaction?

• Ni⁴⁺ + 2e^- → Ni²⁺

• Ni⁴⁺ → Ni²⁺ + 2e^-

• Cd → Cd²⁺ +2e^-

• Cd + 2e^- → Cd²⁺

Which type of equation can represent the oxidation occurring in a reaction?

• a double-replacement reaction equation

• a half-reaction equation

• a neutralization reaction equation

• a transmutation reaction equation

Which half-reaction equation represents the reduction of an iron(II) ion?

• Fe²⁺ → Fe³⁺ + e^-

• Fe²⁺ + 2e^- → Fe

• Fe³⁺ + e^- → Fe²⁺

• Fe → Fe²⁺ + 2e^-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which half-reaction shows conservation of charge?

• Cu + e⁻ → Cu⁺

• Cu²⁺ + 2e⁻ → Cu

• Cu⁺ → Cu + e⁻

• Cu²⁺ → Cu + 2e⁻

Half-reactions can be written to represent all

• double-replacement reactions

• neutralization reactions

• fission and fusion reactions

• oxidation and reduction reactions

Given the balanced ionic equation:

Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)

which equation represents the oxidation half-reaction?

• Zn(s) + 2e⁻ → Zn²⁺(aq)

• Zn(s) → Zn²⁺(aq) + 2e⁻

• Cu²⁺(aq) → Cu(s) + 2e⁻

• Cu²⁺(aq) + 2e⁻ → Cu(s)

Given the reaction for the corrosion of aluminum:

4 Al + 3 O₂ → 2 Al₂O₃

which half-reaction correctly represents the oxidation that occurs?

• Al + 3e⁻ → Al³⁺

• Al → Al³⁺ + 3e⁻

• O₂ + 4e⁻ → 2 O²⁻

• O₂ → 2 O²⁻ + 4e⁻

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2