Redox

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 O^2–

• O₂ → 2 O₂– + 4e^-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Half-reactions can be written to represent all

• double-replacement reactions

• neutralization reactions

• fission and fusion reactions

• oxidation and reduction reactions

Tags

NGSS.HS-PS1-7

Given the balanced ionic equation representing a reaction: 2Al(s) + 3Cu²⁺(aq) → 2Al³⁺(aq) + 3Cu(s) Which half-reaction represents the reduction that occurs?

• Al → Al³⁺ + 3e^-

• Al³⁺ + 3e^- → Al

• Cu → Cu²⁺ + 2e^-

• Cu²⁺ + 2e^- → Cu

Tags

NGSS.HS-PS1-2

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

• Reduced

• Synthesized

• Oxidized

• None of the above

Given the equation: 2 Al + 3 Cu²⁺ → 2 Al³⁺ + 3 Cu The reduction half-reaction is

• Al → Al³⁺ + 3e^–

• Al + 3e^– → Al³⁺

• Cu²⁺ + 2e^– → Cu

• Cu²⁺ → Cu + 2e^–

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which half-reaction correctly represents reduction?

• Ag → Ag⁺ + e^–

• F₂ → 2 F^– + 2e^–

• Au³⁺ + 3e^–→ Au

• Fe²⁺+ e^– → Fe³⁺

Which half-reaction shows conservation of charge?

• Cu + e^– → Cu⁺

• Cu⁺ → Cu + e^–

• Cu²⁺ + 2e^– → Cu

• Cu²⁺ → Cu + 2e^–

Which half-reaction equation represents the reduction of a potassium ion?

• K⁺ + e^– → K

• K + e^– → K⁺

• K⁺ → K + e^–

• K → K⁺ + e^–

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc

• Hydrogen

• Oxygen

• None

Cl₂ + 2e- --> 2Cl ^- is an example of:

• a chemical reaction

• redox

• oxidation

• reduction