SS2: CHEMISTRY - 1ST TERM
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Periodicity and Periodic Table I | Week 15 Topics|1 Quiz
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Quantum Numbers Orbitals & Electrical Structure | Week 26 Topics|1 Quiz
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Periodicity and Periodic Table II | Week 312 Topics|1 Quiz
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Periodic Table and Atomic Properties
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Melting and Boiling Point
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Electrical and Thermal Conductivities
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Atomic Size [Radius]
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Ionic Size [Radius]
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Atomic Volume
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Ionization Energy
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Electron Affinity
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Electronegativity
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Differences between Ionization Energy and Electron Affinity
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Summary of Trends of Atomic Properties
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Theory Questions - Periodicity and Periodic Table II
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Periodic Table and Atomic Properties
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Periodicity and Periodic Properties III | Week 411 Topics|1 Quiz
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Periodicity and Periodic Properties IV | Week 55 Topics|1 Quiz
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Mass-Volume Relationship in Reaction | Week 68 Topics|1 Quiz
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Types of Reactions: Oxidation and Reduction | Week 7 & 87 Topics|1 Quiz
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Oxidation – Reduction Reaction II | Week 93 Topics|1 Quiz
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Electrode Potential and Electrochemical Cells I | Week 106 Topics|1 Quiz
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Electrode Potential and Electrochemical Cells II | Week 115 Topics|1 Quiz
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Electrolysis I | Week 128 Topics|1 Quiz
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Electrolysis II | Week 138 Topics|1 Quiz
Electroplating
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 corrosionCorrosion is defined as a natural process that causes the transformation of pure metals into undesirable substances when they react with substances like water or air. This reaction causes damage and... More.
In electroplating a material (spoon, car, bumper, etc) to be plated is made the cathodeA cathode is the electrode from which a conventional current leaves the electrolyte. It is the negative part of the cell where reduction takes place. More while the anodeAn anode is an electrode of a polarized electrical device through which conventional current enters the device. It is the positive part of electrolytes where oxidation takes place. More is the metal to be coated on the material, and the electrolyteAn electrolyte is a substance that dissociates in water into charged particles called ions. Positively charged ions are called cations. Negatively charged ions are called anions. Simply, an electrolyte is a... More 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 aqueousA solution in which the solvent is water. is called an aqueous solution. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a... More AgNO3
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.