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Half equations: electrolysis

Quiz by Oak National Academy: GCSE Combined Science OCR Higher

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6 questions
Show answers
  • Q1
    What does a half-equation describe?
    What happens to all reactants in a reaction.
    What happens to one reactant in a reaction.
    What happens to the products in a reaction.
    30s
  • Q2
    What do half-equations show?
    Balanced charges and balanced atoms
    Only the atoms
    Only the charges
    30s
  • Q3
    When an atom gains electrons we say it has been ...
    oxidised.
    thermally decomposed.
    reduced.
    30s
  • Q4
    In an electrolysis cell, where does oxidation occur? why?
    At the anode, because positive ions gain electrons.
    At the cathode, because negative ions lose electrons.
    At the cathode, because positive ions gain electrons.
    At the anode, because negative ions lose electrons.
    30s
  • Q5
    What are spectator ions?
    Ions that are formed as a result of the reaction.
    Ions that do not take part in the reaction.
    Ions that react during the reaction.
    30s
  • Q6
    In the electrolysis of molten zinc chloride, the ionic equation is Zn²⁺(l) + 2Cl⁻(l) → Zn(s) + Cl₂(g). Which of the following is correct?
    H⁺ and OH⁻ are spectator ions.
    Zn²⁺ is a spectator ion.
    There are no spectator ions.
    30s

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