By: Brian K Chen

ContentIntroAtoms and elements The natural wayWhat is the ozone layerThe common perceptionScientific truthThe resultHow are CFCs gotten

rid ofWhat’s been done

•What should we do•Interesting facts•Sources

IntroCFC is short for Chloro Fluoro 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.

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 molecule

FlourineCarbonChlorine

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.

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

What is the common perception

Where do CFCs come fromcoolants such as refrigerators and air

conditioners.Aerosols like antiseptic sprays

The scientific truthChloro flouro 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.3 3CFCl CF Cl

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.

3 2Cl O ClO O

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

2ClO O Cl O

The resultThe process was balanced but now the CFCs

are causing ozone molecules to be destroyed faster than they are being created

That is real bad

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

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

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

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

Interesting factsIn some urban areas although the ozone layer

is thinner, there is actually less Ultra-violet radiation reaching the ground

This is because of pollutionThe carbon dioxide and smog in the air

actually helps to block the ultra-violet radiation!!!

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

e_do_cfc_come_from

Thanks for watching

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