Oxidation Number
Chapter Name : Redox Reactions |
Sub Topic Code : 102_11_08_03_03 |
Topic Name : Oxidation Number |
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Sub Topic Name : Decomposition Reactions |
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Introduction
Decomposition is a type of chemical reaction and it may be defined as the
reaction in which a single compound splits into two or more simple substances
under suitable conditions.
Pre-Requisites:
Decomposition Reaction, Thermal decomposition reaction, Electrolytic decomposition reaction,
Activity:
The breakdown of glucose by respiration is a
form of decomposition
Real Life Question:
What happens during breakdown of a substance..?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Decomposition Reaction | In a decomposition reaction, the substance breaks into new substances. |
| Thermal decomposition reaction | Thermal decomposition is a chemical reaction where a single substance breaks into two or more simple substances when heated. |
| Electrolytic decomposition reaction | Electrolytic decomposition may result when electric current is passed through an aqueous solution of a compound. A good example is the electrolysis of water. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Test tube and chemicals | Decomposition of sodium chloride: On passing electricity through molten sodium chloride, it decomposes into sodium and chlorine. |
Real life uses :
The digestion of food in our body is accompanied by a
number of decomposition reactions. The major constituents of our food such as
carbohydrates, fats proteins, etc., decompose to form a number of simpler
substances. These substances further react, releasing large amounts of
energy, which keeps our body working.
Places to visit :
Chemistry
lab
Practical examples around us
| Examples | Explainations |
|---|---|
| Electrolysis of water | 2 H2O ? 2 H2 + O2 Electrolysis of water to make oxygen and hydrogen gas. |
What you learn in Theory:
Decomposition is a type of chemical reaction and it
may be defined as the reaction in which a single compound splits into two or
more simple substances under suitable conditions. It is just the opposite of
the combination reaction.
What you learn in Practice:
In a combination reaction, a substance is formed as
a result of chemical combination, while in a decomposition reaction, the
substance breaks into new substances.