Balancing Redox Equations

Which element is being oxidised in the following chemical reaction?

2KMnO₄ + 5KNO₂ + 3H₂SO₄ → 2MnSO₄ + 3H₂O + 5KNO₃ + K₂SO₄

• S

• Mn

• O

• N

Tags

NGSS.HS-PS1-2

Which element is reduced in the following reaction?

2K₂Cr₂O₇ + 2H₂O + 3S → 3SO₂ + 4KOH + 2Cr₂O₃

• K

• Cr

• O

• S

Tags

NGSS.HS-PS1-2

Identify the oxidising and reducing agent(s) for the following redox reaction

Cu₂O + H₂SO₄ → CuSO₄ + Cu + H₂O

• oxidising agent H₂SO₄, reducing agent Cu₂O

• oxidising agent Cu₂O, reducing agent H₂SO₄

• oxidising agent H₂SO₄, reducing agent H₂SO₄

• oxidising agent Cu₂O, reducing agent Cu₂O

Balance this equation

_CF₄ + _Br₂ → _CBr₄ + _F₂

• 2,1,2,1

• 1,2,2,1

• 1,2,1,2

• 2,2,2,2

Tags

NGSS.HS-PS1-7

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

• Fe²⁺ + Al → Fe + Al³⁺

• Cu + Fe²⁺ → Cu⁺ + Fe³⁺

• F₂ + Br^- → F^- + Br₂

• Fe²⁺ + 2 Cu → 2 Cu⁺ + Fe

Tags

NGSS.HS-PS1-7

Which of the following is the balanced half-reaction for the oxidation of Cu to Cu²⁺?

• Cu → Cu²⁺

• Cu + 2 e^- → Cu²⁺

• Cu → Cu²⁺ + 2 e^-

• Cu - 2e^- → Cu²⁺

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What coefficient would Fe²⁺ have in the following reaction?

___ Al + ___ Fe²⁺ → ___ Al³⁺ + ___ Fe

• 1

• 2

• 3

• 6

Tags

NGSS.HS-PS1-7

What are α and β and γ for a balanced half-equation?

MnO₂ + α H⁺ + β e^- → Mn²⁺ + γ H₂O

• α = 4 β = 2 γ = 2

• α = 2 β = 2 γ = 2

• α = 4 β = 4 γ = 2

• α = 2 β = 4 γ = 2

What are α and β and γ for a balanced half-equation?

NO₃^- + α H⁺ + β e^- → NO + γ H₂O

• α = 2 β = 3 γ = 4

• α = 2 β = 2 γ = 2

• α = 4 β = 4 γ = 3

• α = 4 β = 3 γ = 2

Tags

NGSS.HS-PS1-7

What are α and β and γ and δ for a balanced half-equation?

SO₃^2- + α H₂O → β SO₄^2- + γ H⁺ + δ e^-

• α = 1 β = 1 γ = 2 δ = 2

• α = 1 β = 2 γ = 2 δ = 2

• α = 1 β = 2 γ = 1 δ = 2

• α = 1 β = 1 γ = 2 δ = 1

Tags

NGSS.HS-PS1-7