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4s4 electrolysis( Part 1)
 

4s4 electrolysis( Part 1)

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    4s4 electrolysis( Part 1) 4s4 electrolysis( Part 1) Presentation Transcript

    • ELECTROCHEMISTRY
      • Electrolyte Vs Non-electrolyte
      • Conductor Vs electrolyte
      • Electrolysis
      • Electrolytic cell
      30/06/2010
    • Learning outcomes
      At the end of the lesson, you should able to:
      state the meaning of electrolyte.
      Differentiate between the conductor and electrolyte.
      classify substances into electrolytes and non-electrolytes.
      relate the presence of freely moving ions to electrical conductivity.
    • Electrolyte in daily life
      Why the athletes drink 100-plus drinks or other electrolyte drinks
      after their vigorous training?
      What is the function of electrolyte to the body?
       
      Sweating is the way in which the body maintains its core temperature at 37°C. This results in the loss of body fluid and electrolytes (minerals such as chloride, calcium, magnesium, sodium and potassium) and if unchecked will lead to dehydration and eventually circulatory collapse and heat stroke.
      Electrolytes, especially sodium and potassium, in a drink will reduce urine output, enable the fluid to empty quickly from the stomach, promote absorption from the intestine and encourage fluid retention.
    • Experiment
      Previous
      C. To Investigate the Electrical Conductivity of Compounds
      Title:
      To compare the properties of ionic and covalent compounds
      Problem statement:
      Do electrical conductivity of ionic compounds and covalent compounds differ in solid state and molten state?
    • Carbon
      electrodes
      Molten NaCl conducts electricity
    • NaCl solution
      NaCl solution conducts electricity
    • Electrical conductivity
      MoltenNaCl,
      NaClsolution
      They can conduct electricity
      - due to
      the presence of free moving / mobile ions
      in the electrolytes
      are electrolytes
    • -
      -
      +
      Electrolytes can conduct electricity
      • due to the presence of
      free moving ions in the electrolytes
      Eg.: NaCl solution
      +
      electrolyte
      -
      _ _ _ _ _ _ _ _ _
      +
      -
      _ _ _ _ _ _ _ _
      +
      _ _ _ _ _ _ _ _ _
      -
      +
      _ _ _ _ _ _ _ _
      -
      _ _ _ _ _
      +
      _ _ _ _
    • Electrolyte Vs Non-electrolyte
    • Molten
      Melted in high temperature.
      A metal in its liquid state.
    • Think……
      Electricitycan passes through a Cu wire but there is NO chemical reaction taking place.
      Do you classify Cu wire as an electrolyte?
      Answer: No. Copper wire is not an electrolyte. It is a conductor.
      Because copper wire is in solid state and it does not undergo chemical reaction.
    • Conductor Vs Electrolyte
      Conductor Electrolyte
    • Electrolyte ? Non-electrolyte ?
      Electrolyte
      HClsolution
      NH3solution
      Glucose solution
      Molten lead, Pb
      AgClsolution
      Tetrachloromethane, CCl4
      Zinc wire
      Copper penny
      Non-electrolyte
      Non-electrolyte
      Non-electrolyte
      Electrolyte
      Non-electrolyte
      Conductor
      Conductor
    • Explanation
    • Electrolysis
      A process whereby a compound
      in molten or aqueous state
      are broken down into its constituent elements by passing electricity through an electrolyte.
    • Electrolytic cell
      Battery
      Ammeter(A device used to measure current) / Light bulb
      Wire
      Switch
      Electrodes (Carbon / metal)
      - a conductor in the form of wire, rod or plate which carries electric current in and out of the electrolyte during electrolysis.
      Electrolyte
    • Cations & Anions
      Cations are pawsitive.
      or
      = positive
      Cations are + ve.
      AnionisaNegative ion
    • C-
      A+
    • Cations Cathode
      (+ve ions)
      Anions Anode
      (-ve ions)
    • Form 5
      “AnOX chases a Red CAT “
      (Reduction-Cathode)
      (Anode-Oxidation)
      or
      (both start with vowels)
      (both start with consonants).
    • Oxidation Vs Reduction:
      Form 5
      “ L E O goes G E R ”
      (lose electron-oxidation, gain electron-reduction)
      “O I L R I G ”
      (Oxidation is Losing e-, Reduction is Gaining e- )
      “ ELMO”
      (Electron Loss Means Oxidation )
      “LEO the lion. GER! “ or “ LEO says GER”
      (Losing Electrons Oxidation, Gaining Electrons Reduction)
    • Why can only conduct electricity in molten state? But not in solid state?
      Molten Lead (II) bromide
      Solid Lead (II) bromide
      * Please watch the video clip that I have posted in FB...
    • Popular Q
      Why can only conduct electricity in molten state? But not in solid state?
      Lead (II) bromide, PbBr2 is an ionic compound.
      It consists of +ve Pb2+ ions and –ve Br- ions.
      In solid PbBr2,
      these ions do not move freely
      but are held in fixed positions in lattice.
      When PbBr2 melts (When in molten state), the ions are free to move.
      Hence, it can conduct electricity in molten state.
    • Summary
      Have you understood these?
      • Conductor
      • Electrolyte
      • Non-electrolyte
      • Electrolysis
      • Cations
      • Anions
      • Cathode
      • Anode