CFCs (chlorofluorocarbons) are man-made substances that were formerly used in aerosols and refrigerants. CFCs deplete the ozone layer by breaking ozone molecules into oxygen when exposed to ultraviolet radiation. A single CFC molecule can destroy 100,000 ozone molecules in its lifetime. An international agreement called the Montreal Protocol was implemented to phase out CFC production and allow the ozone layer to recover. While CFCs are being eliminated, continued monitoring is important to ensure protection of the ozone layer.

1. By: Brian K Chen

2. ContentIntroAtoms and elements The natural wayWhat is the ozone layerThe common perceptionScientific truthThe resultHow are CFCs gotten rid ofWhat’s been doneWhat should we do

3. Interesting facts

4. SourcesIntroCFC is short for ChloroFluoro Carbon.It is a man mad substance and is harmful to the environment, more specifically, the ozone layer.It is emitted through many daily appliances, at first, people didn’t even know that it was bad.Nowadays, steps are being made to correct things.

5. Atoms and elements Oxygen -1 oxygen atom is not very important -2 oxygen atoms=the oxygen in the air we breathe -3 oxygen atoms=an ozone moleculeFlourineCarbonChlorine

6. The natural wayNormally, the process of producing ozone is very balancedOne ozone molecule breaks into two oxygen atoms and one oxygen atom. The two oxygen atoms joins with one oxygen atom form another ozone moleculeThe one oxygen atom joins with two oxygen atoms to form another ozone molecule.The process is very balanced.

7. What is the ozone layerThe ozone layer is part of the stratosphere and is made mostly by one element, oxygen.Ozone itself is a substance. One ozone molecule is made of 3 oxygen molecules.The Ozone layer is part of the stratosphere which is one section of the atmosphereWithout the ozone layer, we would be exposed to ultra-violet radiation from the sun.This would cause widespread skin cancer and other problems

8. What is the common perception

10. Where do CFCs come fromcoolants such as refrigerators and air conditioners.Aerosols like antiseptic sprays

11. The scientific truth Chloroflouro carbons can be written as CF3ClThe C is carbon-1 atomF is Flourine-3 atomCl is Chlorine-1 atomsAfter ultraviolet radiation from the sun, one chlorine atom breaks off we have CF3+ClThe single Chlorine atom is the most dangerous.

12. The scientific truthThe single chlorine atom will, after it has broken off, combine with ozone molecule and break it into 1 oxygen atom and one oxygen molecule with two atoms.Then it will combine with one of the oxygen atoms.

13. The scientific truthAfter wards, the combination will combine with an oxygen atom and break down into another oxygen molecule.The following word equations explains this

14. The result The process was balanced but now the CFCs are causing ozone molecules to be destroyed faster than they are being createdThat is real bad

15. Why is the CFC so dangerousThe problem is how long it takes for a CFC molecule to leave the stratosphereNormal physical means cannot get rid of itOn average, one CFC molecule can destroy 100,000 Ozone molecules in its life timeThere are only a few ways of getting rid of it

16. How is the CFC gotten rid ofWhen the chlorine atom collides with other molecules such as hydrocarbons, it forms hydrogen chloride which can leave the atmosphere dissolved in water.Other way is to let the atom slowly drift out

17. What has been doneThere is the Montreal protocol -It links countries together -In this agreement, they all set aims together to cut producing of CFCs -Singapore is included -It has been changed many times to improve it

18. What should we do?????We should check if the goods we buy such as refrigerators don’t have CFCDo projects like this to raise public awareness

19. Interesting factsIn some urban areas although the ozone layer is thinner, there is actually less Ultra-violet radiation reaching the groundThis is because of pollutionThe carbon dioxide and smog in the air actually helps to block the ultra-violet radiation!!!

20. SourcesWikipediaCollins advanced science chemistryhttp://answers.ask.com/Science/Nature/where_do_cfc_come_from