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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:

  • Electroplating
  • Advantages of Electroplating

Electroplating is a method of coating the surface of one metal with another metal. e.g. copper, silver, chromium, nickel, or gold by means of electrolysis for decoration or protection against corrosion.

In electroplating a material (spoon, car, bumper, etc) to be plated is made the cathode while the anode is the metal to be coated on the material, and the electrolyte is a solution of soluble salt of the metal to be plated on the material.

For example in silver plating a spoon cathode is the spoon and the anode is a silver rod 

Electrolyte is aqueous AgNO3

Electrolysis-And-Electroplating

When the current is passed through the cell, the silver rod dissolves at the anode and the ions produced migrate to the cathode where they are discharged and deposited as a layer on the spoon 

At cathode:

\( \scriptsize Ag_{(aq)} \: + \: e^- \rightarrow Ag_{(s)} \)

At anode:

\( \scriptsize Ag_{(l)} \: – \: e^- \rightarrow Ag_{(aq)} \)

Advantages of Electroplating:

1. Electroplating prevents rusting of iron

2. It increases the attractiveness of the object plated 

3. It gives thickness to the object plated 

Examples of electroplated objects: door handles chromium-plated, hospital equipment, silver-plated cutlery, and tin-plated cans.