Oquizy

Which statement correctly identifies the negative electrode and explains why?

Copper, because it has a more negative electrode potential Copper, because it is less reactive and gains electrons Magnesium, because it forms a protective oxide layer Magnesium, because it has a higher tendency to lose electrons

Which of the following is reduced?

Cu → Cu²⁺ Fe³⁺ → Fe²⁺ O²⁻ → O Zn → Zn²⁺

What happens to the mass of the cathode during copper electroplating?

Decreases Increases Stays the same Turns green

Which ionic half-equation shows oxidation?

2H⁺ + 2e⁻ → H₂ Cl₂ + 2e⁻ → 2Cl⁻ Cu²⁺ + 2e⁻ → Cu Zn → Zn²⁺ + 2e⁻

Xinyi filled a beaker with aqueous CuSO₄ for electrolysis and she used inert carbon electrodes. She labels the cathode A and the anode B.
- She observed the following: Bubbles forming at electrode B.
- Red-brown solid forming on electrode A.
Which option correctly identifies the reactions at the electrodes?

A: 2H⁺ + 2e⁻ → H₂; B: Cl⁻ → Cl₂ + e⁻ A: Cu → Cu²⁺ + 2e⁻; B: 4OH⁻ → O₂ + 2H₂O + 4e⁻ A: Cu²⁺ + 2e⁻ → Cu; B: 4OH⁻ → O₂ + 2H₂O + 4e⁻ A: Cu²⁺ → Cu + 2e⁻; B: 2OH⁻ + 2e⁻ → H₂O

What is the correct half-equation at the anode?

H⁺ + e⁻ → ½H₂ H₂ → 2H⁺ + 2e⁻ H₂O → ½O₂ + 2H⁺ + 2e⁻ O₂ + 4e⁻ → 2O²⁻

Quiz: Chemistry - Redox Chemistry