Oxidation Number
Chapter Name : Redox Reactions |
Sub Topic Code : 102_11_08_03_01 |
Topic Name : Oxidation Number |
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Sub Topic Name : Oxidation Number |
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Introduction
Oxidation number denotes the oxidation state of an element in a compound.
Pre-Requisites:
Oxidising
agent, reducing agent, oxidation, reduction
Activity:
Rust
is an oxidized form of Iron
Real Life Question:
How
can you tell how many electrons are present in the valence shell of an atom.?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Reducing agent | A reagent which lowers the oxidation number of an element in a given substance. These reagents are also called as reductants. |
| Oxidising agent | A reagent which can increase the oxidation number of an element in a given substance. These reagents are called as oxidants also. |
| Oxidation | Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion. |
| Reduction | Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Daniel cell | In the Daniel cell, copper and zinc electrodes are immersed in a solution of copper(II) sulfate and zinc sulfate respectively. At the anode, zinc is oxidized. At the cathode, copper is reduced. Then calculate the oxidation of both the reactants. |
Real life uses :
In titration: useful where you have to work out reacting
proportions for use in titration reactions where you don't have enough
information to work out the complete ionic equation.
Places to visit :
Chemistry
lab
Practical examples around us
| Examples | Explainations |
|---|---|
| Rust | Oxidized form of Iron |
What you learn in Theory:
Oxidation number represents the degree of oxidation of
an element in a substance. This degree of oxidation (often termed the elements
oxidation state) is with the exception of coordination compounds where a
different definition applies, the imaginary charge on the atom if the substance
were broken down into ions.
What you learn in Practice:
Oxidation state shows the total number of electrons
which have been removed from an element (a positive oxidation state) or added
to an element (a negative oxidation state) to get to its present state.