Ozone research presentation

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Ozone research presentation

  1. 1. Meg Bobo
  2. 2. What Is Ozone?  The formula for ozone is O3  Ozone gas is “an allotrope, or form, of the element oxygen” (McGrath 1).  Ozone is typically located in the stratosphere but can also be found in the troposphere (Tran et al. 1; Kimbrough 8).  Ozone in the stratosphere protects life on Earth from most harmful UV-B radiation and all destructive UV-C radiation (McGrath 3).  Ozone in the troposphere can cause a variety of health problems (Kimbrough 8).
  3. 3. What Is the Chapman Cycle?  The Chapman Cycle is the process by which ozone is naturally formed and destroyed in the ozone layer (Tran et al. 2).  The Chapman Cycle is able to absorb UV radiation because the reactions which make it up are exothermic (McGrath 2).  The Chapman Cycle consists of three primary reactions: an oxygen molecule splits apart, an oxygen atom combines with an oxygen molecule, and an ozone molecule splits apart (Kimbrough 7).
  4. 4. What Is the Chapman Cycle?  Step one:  O22O (Kimbrough 7)  Step two:  O+O2O3 (McGrath 2)  Step three:  O3O2+O (Kimbrough 7)
  5. 5. How Is Ozone Formed in the Troposphere?  Step one:  2O2+N22NO2 (Kimbrough 8)  Step two:  NO2NO+O (Kimbrough 8)  Step three:  O+O2O3 (Kimbrough 8)
  6. 6. What Is Ozone Depletion?  When CFCs are released into the atmosphere, they gradually float up into the stratosphere (McGrath 3).  Then, the CFCs are broken apart by sunlight into individual chlorine, fluorine, and carbon atoms (McGrath 3). This reaction is a decomposition reaction.  Finally, chlorine steals an oxygen atom from an ozone molecule, creating chlorine monoxide and an oxygen molecule (McGrath 3). This reaction is a single replacement reaction.  Cl+O3ClO+O2
  7. 7. Why Should You Care About Ozone?  Ozone in the stratosphere absorbs harmful UV radiation (Kimbrough 8).  Ozone depletion in the stratosphere could be catastrophic for the earth’s ecosystems: skin cancer, cataracts, snow blindness, and reduced immunity in humans, reduced photosynthesis in plants and plankton, and developmental problems in fish (Kimbrough 9).  On the other hand, an increase in ozone in the troposphere could lead to serious lung problems (Kimbrough 9).
  8. 8. Works Cited  Kimbrough, Doris R. "Ozone--Molecule with a Split Personality." ChemMatters Sept. 2001: 7-9. ACS. Web. 6 Apr. 2014. <http://www.acs.org/content/dam/acsorg/education/resources/ highschool/chemmatters/chemmatters-september-2001.pdf>.  McGrath, Jane. "How the Ozone Layer Works" 29 April 2008. HowStuffWorks.com. <http://science.howstuffworks.com/environmental/green- science/ozone-layer.htm> 06 April 2014.  Tran, Caroline, et al. "Depletion of the Ozone Layer." UC Davis ChemWiki. U of California Davis, n.d. Web. 6 Apr. 2014. <http://chemwiki.ucdavis.edu/Physical_Chemistry/Kinetics/Cas e_Studies%3A_Kinetics/Depletion_of_the_Ozone_Layer>.

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