Electro

    Cards (56)

    • What is electrolysis?
      Decomposition of a liquid electrolyte using electricity
    • What are the electrodes used in electrolysis made of?
      Graphite
    • What are the two types of electrodes in electrolysis?
      Cathode and anode
    • Why are graphite rods used as electrodes?
      They are good conductors and unreactive
    • What is the negative electrode called?
      Cathode
    • What is the positive electrode called?
      Anode
    • What is an electrolyte?
      A liquid or solution that conducts electricity
    • What happens to positive ions during electrolysis?
      They move towards the cathode
    • What happens to negative ions during electrolysis?
      They move towards the anode
    • What occurs at the anode during electrolysis?
      Oxidation occurs
    • What occurs at the cathode during electrolysis?
      Reduction occurs
    • What is the overall equation for the electrolysis of molten lead(II) bromide?
      PbBr₂ → Pb + Br₂
    • What is produced at the cathode during the electrolysis of molten lead(II) bromide?
      Silvery liquid metal
    • What is produced at the anode during the electrolysis of molten lead(II) bromide?
      Brown gas
    • What is the half-equation for the reduction at the cathode during the electrolysis of molten lead(II) bromide?
      Pb²⁺ + 2e⁻ → Pb
    • What is the half-equation for the oxidation at the anode during the electrolysis of molten lead(II) bromide?
      2Br⁻ → Br₂ + 2e⁻
    • What is the overall equation for the electrolysis of molten lithium chloride?
      2LiCl → 2Li + Cl₂
    • What is produced at the cathode during the electrolysis of molten lithium chloride?
      Silvery metal
    • What is produced at the anode during the electrolysis of molten lithium chloride?
      Chlorine gas
    • What is the half-equation for the production of lithium at the cathode during the electrolysis of lithium chloride?
      Li⁺ + e⁻ → Li
    • What is the half-equation for the production of chlorine at the anode during the electrolysis of lithium chloride?
      2Cl⁻ → Cl₂ + 2e⁻
    • What is the overall equation for the electrolysis of dilute sulfuric acid?
      2H₂O → 2H₂ + O₂
    • What is produced at the cathode during the electrolysis of dilute sulfuric acid?
      Hydrogen gas
    • What is produced at the anode during the electrolysis of dilute sulfuric acid?
      Oxygen gas
    • What is the half-equation for the production of hydrogen at the cathode during the electrolysis of dilute sulfuric acid?
      2H⁺ + 2e⁻ → H₂
    • What is the half-equation for the oxidation at the anode during the electrolysis of dilute sulfuric acid?
      4OH⁻ → 2H₂O + O₂ + 4e⁻
    • Why is cryolite used in the extraction of aluminium?
      It lowers the melting point and increases conductivity
    • What happens to the carbon electrodes during the electrolysis of aluminium extraction?
      They wear away and need replacement
    • What is the purified aluminium ore dissolved in before electrolysis?
      Aluminium oxide
    • What is the half-equation for the production of aluminium at the cathode during the extraction of aluminium?
      Al³⁺ + 3e⁻ → Al
    • What is the half-equation for the production of oxygen at the anode during the extraction of aluminium?
      2O²⁻ → O₂ + 4e⁻
    • Why is recycling aluminium important?
      It saves resources, energy, and costs less
    • What is the reaction that proves the presence of iodide?
      Reaction with starch paper turns it blue
    • What is the color of lead(II) iodide precipitate?
      Yellow
    • What is the main reason for the high cost of aluminium extraction?
      High electricity cost and temperature needed
    • What is the role of the aluminium oxide crust during extraction?
      It keeps some heat in, saving money
    • What is the term for the process of breaking down a compound using electricity?
      Electrolysis
    • What is the importance of understanding oxidation and reduction in electrolysis?
      It helps explain electron transfer during reactions
    • How does the presence of impurities in bauxite affect aluminium extraction?
      Impurities must be removed to lower melting point
    • What is the significance of the ions attracted to the electrodes during electrolysis?
      They determine the products formed at each electrode
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