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| Name | How to work out the chemical formula of a CFC using its number |
| Video Uploader | Video From Karina Adcock |
| Upload Date | This Video Uploaded At 05-07-2017 16:33:42 |
| Video Discription | CFC numbering system This video is part of a playlist: The Ozone Hole https://www.youtube.com/playlist?list=PLVe64sIb7fSYa-rr9cbSOigAtjRNwpuXv Video Script: CFC stand for chlorofluorocarbons and these are compounds that contain chlorine, fluorine and carbon. They have a carbon chain with chlorines and fluorines attached. There are many different kinds of CFCs with different numbers of carbons chlorines and fluorines. These three examples are the three most common CFCs, CFC-11, CFC-12 and CFC-113. CFCs have a special numbering system to identify them. You can work out the chemical formula from the CFCs number and this video is going to show you two different methods of doing this. The same numbering system is also used for HCFCs which are hydrochlorofluorocarbons and contain hydrogen as well as chlorine, fluorine and carbon. So for the first method you need to assume that each CFC has a three digit numerical code. And the first number is the number of carbons plus 1, the second number is the number of hydrogens minus 1 and the third number is the number of fluorines. Then because carbons in CFCs have four bonds, they are bonded to four other atoms and so from this the number of chorines can be worked out. Also for CFCs with only two numbers you have to assume that the first number is zero. However this system is considered to be overly complicated and another method exists where you add 90 to whatever the CFC number is. This will always produce a three digit number. And the first number will be the number of carbons and the second number will be the number of hydrogens and the third number will be the number of fluorines and then you can work out the chlorines from there. The first method and the second method give the same results and you can use either one of theses methods to work out the chemical formula of any CFC using its number. [BDfl_xjsJ6Q] |
| Category | Science & Technology |
| Tags | CFC | CFCs | chlorofluorocarbons | CFC numbering system | HCFC numbering system | CFC code | CFC chemical formula | CFC numbers | halocarbon numbering system |
