1 / 10

Ozone Depletion

Ozone Depletion. E.4.1:. When ODS substances reach the ozone layer the UV rays from the sun break them down and release molecules that destroy the ozone molecules. E.4.1:. E.4.1:. CFCl3 + UV Light ==> CFCl2 + Cl Cl + O3 ==> ClO + O2 ClO + O ==> Cl + O2

laurel
Télécharger la présentation

Ozone Depletion

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ozone Depletion

  2. E.4.1: • When ODS substances reach the ozone layer the UV rays from the sun break them down and release molecules that destroy the ozone molecules.

  3. E.4.1:

  4. E.4.1: • CFCl3 + UV Light ==> CFCl2 + ClCl + O3 ==> ClO + O2ClO + O ==> Cl + O2 • The free chlorine atom is then free to attack another ozone molecule • Cl + O3 ==> ClO + O2ClO + O ==> Cl + O2 • and again ... • Cl + O3 ==> ClO + O2ClO + O ==> Cl + O2 • and again... for thousands of times.

  5. E.4.1 • http://www.bom.gov.au/lam/Students_Teachers/ozanim/ozoanim.shtml

  6. E.4.2: • Examples of Ozone Depleting Substances arechlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons, methyl bromide, carbon tetrachloride, and methyl chloroform.

  7. E.4.2:

  8. E.4.3: • Chlorofluorocarbons (CFCs) are compounds containing chlorine, fluorine and carbon. CFCs have many uses such as aerosoland refrigerants.

  9. E.4.3: • In order to replace CFCs attempts have been made to develop compounds that have less ozone depleting potential(ODP). • Hydrochloroflourocarbons -Although they break down more quickly in the atmosphere, and have less potential for destroying the ozone they could still damage it if they are overused. • Hydrofluorocarbons-They have no chlorine and therefore won’t break down ozone molecules however, their toxicity is unsafe. • Hydrocarbons-They are cheap and won’t damage the ozone however they are poisonous and flammable.

  10. Fin.

More Related