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20 Cards in this Set
- Front
- Back
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Wavelength absorbed by Ozone
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330nm or less
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Stronger bonds require....
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lower wavelength light
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Why are chlorine free radicals dangerous to levels of ozone
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Radicals act as a catalyst to convert oxygen and ozone into O2
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Wavelength absorbed by oxygen
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240nm or less
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Which bond is stronger? The one in oxygen or the one in ozone
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The one in oxygen, as it is a double bond, whereas ozone has a bond order of one and a half.
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What is the reaction for the photo-dissociation of NO2 in the presence of uv light?
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NO2(g) + hv --> NO(g) + O.(g)
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What bond is broken when CCl2F2 reacts with hv?
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The C-Cl bond because it is weaker
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cause of ozone delpetion over the poles
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The formation of ice crystals that act as surface catlaysts. Due to the frigid temperatures during the early spring month
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What process breaks C-Cl bonds in CFC's
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Homolysis through presence of uv light - the breakdown into two equal pieces
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Why is ozone depletion more catastrophic in polar regions?
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The very cold temperatures traps air at the pole and any water turns into ice crystals. These act as surface catalyst where ozone depleting reactions take place to produce chlorine, when the sun comes out chlorine is photo=dissociated w/UV light to produce free radical chlorine, which catalyze ozone destruction.
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What is formed when ice crystals combine with pollutants?
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reactive chemicals like Cl2
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What happens when NO2 reacts with hv?
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NO and O. is formed
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How is the ozone depletion naturally reversed
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The diffusion of warmer ozone containing air from lower altitudes
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Why is ozone depletion milder in polar spring?
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The temperatures increase and the ice crystals melt, so they cannot act as catalysts. New air flow replaces destroyed ozone
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why is nitrogen monoxide present in the atmosphere?
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NO is formed by the high temperature reaction between nitrogen and oxygen gases in supersonic aircraft engines
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What pollutants act as a catalyst for ozone depletion?
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Nitrogen oxide and Cholorfluorocarbons (CFCs)
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what does hf and hv stand for?
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The energy in a quantum of light
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NO2 undergoes...
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...photo-dissociation in the presence of uv light.
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What wavelength is needed to break an ozone molecule?
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330nm
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What wavelength is needed to break an oxygen molecule?
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220nm
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