electrolysis P1

    Cards (18)

    • define electrolysis
      the breaking down of a substance using electricity
    • what is an anode
      a positive electrode
    • what is a cathode
      a negative electrode
    • which ions move to the cathode
      cations move to the cathode
    • which ions move to the anode
      anions move to the anode
    • define reduction
      gain of electrons
    • define oxidation
      loss of electrons
    • define aqueous
      a substance disolved in water
    • why must the rods not touch in this experiment
      it would produce a short circuit if they did
    • what voltage would you use in this experiement and why would you not use a higher one
      low voltage is used to avoid overheating
    • what would happen when you place blue limes paper next to the anode and what does this mean
      it becomes bleached
      proves that gas is chlorine
    • what is an industrial use for electrolysis
      purification of metals like copper
    • why is purification of metals like copper important
      important for producing pure metals for electrical wiring
    • when electrolysis is used to extract metals from their ores why must the positive electrode be replaced
      the anode wears away overtime because it reacts and breaks down during electrolysis meaning it gradually gets used up and must be replaced
    • positive electrode with solution copper chloride
      observation: bubbles formed
      element formed: chlorine
      state: gas
    • negative electrode with solution copper chloride
      observation: bubbles formed + faint fizzing
      element formed: hydrogen
      state: gas
    • positive electrode with solution sodium chloride
      observation: bubbles formed + smell of chlorine
      element formed: chlorine
      state: gas
    • negative electrode with solution sodium chloride
      observation: reddish brown solid forms
      element formed: copper
      state: gas