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Oxidation, reduction and half-equations

12th grade (Year 13 in England) · 16 questions · Common Core: NGSS.HS-PS1-2 · England: GCSE Chemistry: Chemical changes (oxidation and reduction in terms of electrons, Higher)

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  1. Question 1

    Complete the half-equation at the cathode: Fe³⁺ + ? e⁻ → Fe. How many electrons are needed?

    Answer

  2. Question 2

    Magnesium is added to a solution containing silver ions and displaces the silver. Which species is oxidised?

    • A. magnesium atoms
    • B. silver ions

  3. Question 3

    Redox: which statement is NOT true?

    • A. Oxidation is the loss of electrons.
    • B. Reduction always means gaining oxygen.
    • C. Oxidation and reduction always happen together.
    • D. Reduction is the gain of electrons.

  4. Question 4

    Complete the half-equation at the cathode: Fe³⁺ + ? e⁻ → Fe. How many electrons are needed?

    Answer

  5. Question 5

    Zinc is added to a solution containing copper ions and displaces the copper. Which species is reduced?

    • A. zinc atoms
    • B. copper ions

  6. Question 6

    Redox: which statement is NOT true?

    • A. In a displacement reaction, the more reactive metal is oxidised.
    • B. Reduction is the gain of electrons.
    • C. Oxidation and reduction always happen together.
    • D. At the anode, ions gain electrons.

  7. Question 7

    Complete the half-equation at the cathode: Al³⁺ + ? e⁻ → Al. How many electrons are needed?

    Answer

  8. Question 8

    Zinc is added to a solution containing silver ions and displaces the silver. Which species is reduced?

    • A. zinc atoms
    • B. silver ions

  9. Question 9

    Redox: which statement is NOT true?

    • A. Oxidation and reduction always happen together.
    • B. Oxidation is the loss of electrons.
    • C. At the anode, ions gain electrons.
    • D. Reduction is the gain of electrons.

  10. Question 10

    Complete the half-equation at the cathode: Pb²⁺ + ? e⁻ → Pb. How many electrons are needed?

    Answer

  11. Question 11

    Copper is added to a solution containing silver ions and displaces the silver. Which species is oxidised?

    • A. copper atoms
    • B. silver ions

  12. Question 12

    Redox: which statement is NOT true?

    • A. Oxidation and reduction always happen together.
    • B. Reduction is the gain of electrons.
    • C. At the anode, ions gain electrons.
    • D. In a displacement reaction, the more reactive metal is oxidised.

  13. Question 13

    Complete the half-equation at the cathode: Na⁺ + ? e⁻ → Na. How many electrons are needed?

    Answer

  14. Question 14

    Iron is added to a solution containing silver ions and displaces the silver. Which species is reduced?

    • A. iron atoms
    • B. silver ions

  15. Question 15

    Redox: which statement is NOT true?

    • A. Oxidation is the loss of electrons.
    • B. Reduction is the gain of electrons.
    • C. Reduction always means gaining oxygen.
    • D. Oxidation and reduction always happen together.

  16. Question 16

    Complete the half-equation at the cathode: Ag⁺ + ? e⁻ → Ag. How many electrons are needed?

    Answer

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  1. 3
  2. magnesium atoms
  3. Reduction always means gaining oxygen.
  4. 3
  5. copper ions
  6. At the anode, ions gain electrons.
  7. 3
  8. silver ions
  9. At the anode, ions gain electrons.
  10. 2
  11. copper atoms
  12. At the anode, ions gain electrons.
  13. 1
  14. silver ions
  15. Reduction always means gaining oxygen.
  16. 1