Polyhalogen Compounds
Chapter Name : Haloalkanes And Haloarenes |
Sub Topic Code : 102_12_10_07_05 |
Topic Name : Polyhalogen Compounds |
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Sub Topic Name : Freons |
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Introduction
1.The chlorofluorocarbon compounds of methane and ethane are collectively known as Freon's. 2.They are extremely stable, nonreactive, non-toxic, non-corrosive and easily liquefiable gases. 3.Freon 12 (CCl2F2) is one of the most common Freon's in industrial use. It is manufactured from tetrachloromethane by Swart's reaction. 4.These are usually produced for aerosol propellants, refrigeration and air conditioning purposes. 5.By 1974, total Freon production in the world was about 2 billion pounds annually. 6.Most Freon, even that used in refrigeration, eventually makes its way into the atmosphere where it diffuses unchanged into the stratosphere. 7.In stratosphere, Freon is able to initiate radical chain reactions that can upset the natural ozone balance.
Pre-Requisites:
Elements, compounds
Activity:
Freon's are usually produced for aerosol propellants, refrigeration and air conditioning purposes.
Real Life Question:
Which gas is used in air conditioners?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Polyhalogen compounds | Carbon compounds containing more than one halogen atom are called poly halogen compounds. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| air conditioners | These are usually produced for aerosol propellants, refrigeration and air conditioning purposes. |
Real life uses :
Freon's are usually produced for aerosol propellants, refrigeration and air conditioning purposes.
Places to visit :
Departmental store
Practical examples around us
| Examples | Explainations |
|---|---|
| Perfume bottle | Carbon tetra-chloride is produced in large quantities for use in the manufacture of refrigerants and propellants for aerosol cans. |
What you learn in Theory:
1.The chlorofluorocarbon compounds of methane and ethane are collectively known as Freon's. 2.They are extremely stable, nonreactive, non-toxic, non-corrosive and easily liquefiable gases. 3.Freon 12 (CCl2F2) is one of the most common Freon's in industrial use. It is manufactured from tetrachloromethane by Swart's reaction. 4.These are usually produced for aerosol propellants, refrigeration and air conditioning purposes. 5.By 1974, total Freon production in the world was about 2 billion pounds annually. 6.Most Freon, even that used in refrigeration, eventually makes its way into the atmosphere where it diffuses unchanged into the stratosphere. 7.In stratosphere, Freon is able to initiate radical chain reactions that can upset the natural ozone balance.
What you learn in Practice:
Polyhalogen compounds have a variety of uses