What is CFC and why do we use it?
A CFC is a compound containing the elements Carbon , Fluorine and Chlorine. CFCs were developed for use as refrigerants, propellants for aerosols and also a gas to generate foamed plastics such as expanded polystyrene. The compound was so great for all of the above mentioned uses because it was non-flammable (I wouldn't cause fire easily) and also it was non-toxic (It will not harm when inhaled).
Although , the CFCs seem perfect for commercial use there is a downside. The CFCs can punch holes through the ozone layer, this happens when carbon to chlorine bonds break high up in the atmosphere to create chlorine radicals(radicals are very reactive indeed). These radicals then go and catalyse the conversion of the ozone(O3) into oxygen (O2) therefore creating holes quickly in the ozone layer. Holes in the ozone layer can allow for harmful UV rays to enter the earth and may potentially damage so people by causing skin cancer. A small amount of CFCs are still used to this day but only with simple alkanes such as Butane (a four carbon chained alkane). An explanation of the harmful parts of CFCs is show in the video below:
Naming compounds from numbered CFCs?
Many CFC codes have been seen several times before but the actual molecular compound of the numbered and coded molecule is unknown. A way to work out the molecular formula from the numbered CFC you have to break up the three last digits into 3 parts; a , b and c (if there is only two digits a = 0). For example 'CFC-011' a is equalled to 0 in this case and a is also always the number of carbon atoms -1. Moreover , b follows a similar principle where its the number of hydrogen atoms plus one. Lastly, c is simply the number of chlorine atoms.