Oxidation Number
Chapter Name : Redox Reactions |
Sub Topic Code : 102_11_08_03_04 |
Topic Name : Oxidation Number |
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Sub Topic Name : Displacement Reactions |
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Introduction
In a displacement reaction, an ion (or an atom) in a compound is replaced by an ion (or an atom) of another element.
Pre-Requisites:
Metal displacement, Displacement Reactions, Non-metal displacement
Activity:
The reaction between iron nails and copper sulphate solution.
Real Life Question:
How is the chemical reactivity of metals linked with their position in the electrochemical series?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Metal displacement | A metal in a compound can be displaced by another metal in the uncombined state. |
| Non-metal displacement | The non-metal displacement redox reactions include hydrogen displacement and a rarely occurring reaction involving oxygen displacement. |
| Displacement Reactions | In a displacement reaction, an ion (or an atom) in a compound is replaced by an ion (or an atom) of another element. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Test tube and chemicals | If a strip of magnesium metal is placed in copper sulphate solution, the blue colour of copper sulphate disappears and the magnesium metal turns brown as the displaced copper is deposited on it. In the reactivity series, the position of magnesium is above that of copper. So it is more reactive than copper and it would displace copper from copper sulphate solution. |
Real life uses :
Halogen recovery.
Places to visit :
Chemistry lab.
Practical examples around us
| Examples | Explainations |
|---|---|
| Iron nails and copper sulphate solution | Change in colour of solution after adding nails. |
What you learn in Theory:
Metals that can displace the other metals from salt solutions.
What you learn in Practice:
In a displacement reaction, an ion (or an atom) in a compound is replaced by an ion (or an atom) of another element.