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SS2: CHEMISTRY - 1ST TERM

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  1. Periodicity and Periodic Table I | Week 1
    5 Topics
    |
    1 Quiz
  2. Quantum Numbers Orbitals & Electrical Structure | Week 2
    6 Topics
    |
    1 Quiz
  3. Periodicity and Periodic Table II | Week 3
    12 Topics
    |
    1 Quiz
  4. Periodicity and Periodic Properties III | Week 4
    11 Topics
    |
    1 Quiz
  5. Periodicity and Periodic Properties IV | Week 5
    5 Topics
    |
    1 Quiz
  6. Mass-Volume Relationship in Reaction | Week 6
    8 Topics
    |
    1 Quiz
  7. Types of Reactions: Oxidation and Reduction | Week 7 & 8
    7 Topics
    |
    1 Quiz
  8. Oxidation – Reduction Reaction II | Week 9
    3 Topics
    |
    1 Quiz
  9. Electrode Potential and Electrochemical Cells I | Week 10
    6 Topics
    |
    1 Quiz
  10. Electrode Potential and Electrochemical Cells II | Week 11
    5 Topics
    |
    1 Quiz
  11. Electrolysis I | Week 12
    8 Topics
    |
    1 Quiz
  12. Electrolysis II | Week 13
    8 Topics
    |
    1 Quiz



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Topic Content:

  • Meaning of Lead Acid Accumulator
  • Lead Accumulator Discharging
  • Lead Accumulator Recharging
  • Difference between Primary and Secondary Cell

The lead acid accumulator is used in car batteries. It is also called a storage cell because it must be charged by passing current through it.

In a lead storage battery, the anode is metallic lead and the cathode is lead(IV) oxide. The electrolyte is dilute tetraoxosulphate(VI) acid solution. When the two electrodes are connected to an external circuit, it produces electricity by discharging.

Lead Accumulator Discharging:

At the Anode (Discharging):

When in use as a source of direct current the accumulator discharges:- The Lead atoms release two electrons each to be oxidized to Lead(II) ions, Pb2+, which combine with tetraoxosulphate(VI) ions [SO42- ], in the electrolyte to become deposited on the anode as lead(II) tetraoxosulphate (IV), PbSO4

Pb(s)  → Pb2+(aq) + 2e

Pb2+(aq) +   SO42(aq)  → PbSO4(s)

The electrons released pass round an external circuit as an electric current and can be used in: 

  • starting the engine of vehicle,
  • lighting up of car lamps before arriving at the cathode.

At the Cathode (Discharging):

The electrons are accepted at the cathode, lead(IV) oxide and the hydrogen ions from the electrolyte undergo redox reaction as follows:

 

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