By: Brian K Chen

Content Intro

Atoms and elements

The natural way

What is the ozone layer

The common perception

Scientific truth

The result

How are CFCs gotten rid of

What’s been done

•What should we do•Interesting facts•Sources

Intro CFC 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

Flourine

Carbon

Chlorine

The natural way Normally, the process of producing ozone is very

balanced

One ozone molecule breaks into two oxygen atoms and one oxygen atom.

The two oxygen atoms joins with one oxygen atom form another ozone molecule

The one oxygen atom joins with two oxygen atoms to form another ozone molecule.

The process is very balanced.

What is the ozone layer The 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 atmosphere

Without 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 from coolants such as refrigerators and air conditioners.

Aerosols like antiseptic sprays

The scientific truth Chloro flouro carbons can be written as CF3Cl

The C is carbon-1 atom

F is Flourine-3 atom

Cl is Chlorine-1 atoms

After ultraviolet radiation from the sun, one chlorine atom breaks off we have CF3+Cl

The single Chlorine atom is the most dangerous.

3 3CFCl CF Cl

The scientific truth The 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 truth After 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 result The 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 dangerous The problem is how long it takes for a CFC molecule to

leave the stratosphere

Normal physical means cannot get rid of it

On average, one CFC molecule can destroy 100,000 Ozone molecules in its life time

There are only a few ways of getting rid of it

How is the CFC gotten rid of When 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 done There 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 CFC

Do projects like this to raise public awareness

Interesting facts In some urban areas although the ozone layer is

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

This is because of pollution

The carbon dioxide and smog in the air actually helps to block the ultra-violet radiation!!!

Sources Wikipedia

Collins advanced science chemistry

http://answers.ask.com/Science/Nature/where_do_cfc_come_from

Thanks for watching

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