Ozone- mind map 1

Can't actually fit all the info on this mid map and make it readable when printed out so gonna do some more on ozone. This one is more about oxone itself and related chemicals.

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  • Ozone
    • Ozone destroyers
      • NO reacts with ozone
        • NO + O3 -> O2 +NO2
        • NO2 + O -> NO + O2
        • The NO is reformed -> another chain reaction
        • The increased use of fertilisershas lead to an increase in NO2 concentration.
    • Chlorine Reservoir Molecules
      • A substance that stores chlorine in the stratosphere
      • Methane reacts with chlorine radicals to form HCl
        • CH4 + Cl -> CH3 + HCl
        • Most methane is oxidised in the troposphere but some reaches the stratosphere.
      • Some CRMs get carried down to the troposphere, dissolve in water and get removed from the atmosphere as rain.
      • Some can react with each other forming Cl, forming Cl radicals again.
        • This is particularly a problem at the Antarctic.
          • HCl and ClONO2 adsorb (stick to the surface) of solid particlesin the polar stratospheric clouds and react.
            • The HNO3 dissolves into the ice particles but Cl2 gas enters the stratosphere getting trapped in the isolated core of the Atlantic vortex.
            • The Cl2 photodissociates into Cl radicals. Cl2 + hv -> Cl + Cl
    • About ozone
      • Formed in troposphere
      • Secondary pollutant
      • Irritant, toxic gas- high concentrations detrimental to human health.
    • How is ozone formed?
      • Oxygen molecules in the stratosphere absorb energy in the form of ultraviolet radiation.
        • O2 + hv _> O + O
          • Endothermic
          • 498 kJmol of energy is absorbed
          • Oxygen biradicals
          • These highly reactive oxygen radicals then react with oxygen molecules.
            • O + O2 -> O3
    • How is ozone destroyed?
      • Oxygen radicals can react with ozone molecules.
        • O + O3 -> O2 + O2
          • This is exothermic, releasing 392 kHmol of heat energy into the stratosphere.
      • O3 + hv -> O2 + O
      • Ozone molecules absorb UV radiation and split into oxygen radicals.
  • HCl + ClONO2 -> Cl2 + HNO3
    • HCl and ClONO2 adsorb (stick to the surface) of solid particlesin the polar stratospheric clouds and react.
      • The HNO3 dissolves into the ice particles but Cl2 gas enters the stratosphere getting trapped in the isolated core of the Atlantic vortex.
      • The Cl2 photodissociates into Cl radicals. Cl2 + hv -> Cl + Cl

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