• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Trouble in the ozone layer - The chlorofluorocarbons (or CFCs for short) have recently received a great deal of attention, and notoriety, as a result of being implicated in the destruction of the ozone layer.

Extracts from this document...

Introduction

Rebecca Kyle

Chemistry, L6M

Trouble in the ozone layer

The chlorofluorocarbons (or CFCs for short) have recently received a great deal of attention, and notoriety, as a result of being implicated in the destruction of the ozone layer. CFCs (also known as Freons) are a family of chemicals based upon hydrocarbon skeletons (most often methane), where some or all of the hydrogens have been replaced with chlorine and/or fluorine atoms. These compounds are non-flammable, tasteless and odourless, and chemically stable. Their other important property is their volatility, having boiling points close to zero degrees Centigrade. These physical properties make them ideal for use as refrigerant gases in air conditioners, freezers and refrigerators. Their low boiling points also make them ideal for blowing agents for foam plastics, allowing the foam to expand as the liquid CFC boils.

Chlorofluorocarbons are regularly blamed for causing damage to our environment.

...read more.

Middle

image00.png

It is the atomic chlorine that does the damage, since it can react with ozone (O3) to form oxygen

image01.png

The developments of compounds such as CFCs and BCF illustrate aspects of the work of chemists which benefit society and the environment. Unwanted fires cause considerable economic and environmental damage.

Often chemists respond tot he needs of society by developing new, safer products. This happened in 1928 when Thomas Midgely was asked to find a safer alternative to the early refrigerants sulphur dioxide and ammonia. He suggested the use of CF Cl  and demonstrated its lack of toxicity of inhaling the gas and blowing out a candle.

In recent years we have learnt that the introduction of CFCs like CF Cl  were not without environmental consequences.

...read more.

Conclusion


Bibliography

http://www.ch.ic.ac.uk/vchemlib/mim/bristol/cfcs/cfc_text.htm

School textbook- Chemistry 1, endorsed by OCR

...read more.

This student written piece of work is one of many that can be found in our GCSE The Earth and Beyond section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE The Earth and Beyond essays

  1. Greenhouse Effect.

    So evidence is mounting that we, mankind are affecting the global climate, and the current warming has exceeded the natural fluctuations. Carbon dioxide (CO2)

  2. AS Chemistry: Chemistry of the Stratosphere

    He detected small concentrations of CFC 11 in rural areas, far away from potential sources. He recognised that such a stable gas would accumulate and move in the atmosphere. Sherwood Rowland and Mario Molina found that when CFCs reached the troposphere they are broken down by the absorption of UV light.

  1. The Greenhouse Effect and the Ozone Layer.

    "Surface temperature has increased from 0.5 to 1.0 degrees since the nineteenth century. So as cold places get warmer, the polar ice caps will melt. Rainfall patterns will change, more rain in some areas and less in others, and severe weather patterns occur more often, meaning more floods, more storms, more hurricanes"(engageevent.gov/enviromental/23j).

  2. Journey to the farthest planet (Pluto).

    Scientists have classified AIDS dependency ratio into 5 clades comprising five main places with most number of AIDS patients. Scientists say that vaccine that work for certain clades could not be use for the other as the virus could be somehow different.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work