Half-equations and ionic equations Quiz
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5 questions, one answer each
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1. Which half-equation shows reduction?
- A. Fe²⁺ → Fe³⁺ + e⁻
- B. 2I⁻ → I₂ + 2e⁻
- C. Cl₂ + 2e⁻ → 2Cl⁻
- D. Zn → Zn²⁺ + 2e⁻
2. How many electrons are needed in MnO₄⁻ + 8H⁺ + ?e⁻ → Mn²⁺ + 4H₂O?
- A. 5
- B. 3
- C. 4
- D. 7
3. Fe²⁺ → Fe³⁺ + e⁻ is combined with Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O. How many Fe²⁺ ions react with each dichromate ion?
- A. 3
- B. 6
- C. 1
- D. 14
4. Which is the correct ionic equation for zinc and copper(II) ions?
- A. Zn + Cu → Zn²⁺ + Cu²⁺
- B. Zn²⁺ + Cu → Zn + Cu²⁺
- C. Zn + 2Cu²⁺ → Zn²⁺ + 2Cu
- D. Zn + Cu²⁺ → Zn²⁺ + Cu
5. What must be done to the half-equations before they are added?
- A. Multiply to give equal numbers of electrons
- B. Add H⁺ to each
- C. Remove all the water
- D. Write them in the same direction as the oxidation numbers