I metal oxides and sulfides are only possible because

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I Metal oxides and sulfides are only possible because the relevant enthalpies of lattice formation are extremely negative: O 2 - S 2 - Li + - 2925 - 2296 Be 2+ - 4443 Mg 2+ - 3850 - 3406 Ca 2+ - 3461 - 3119 Al 3+ - 15 916
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Allotropes of oxygen and sulfur Allotropes: two or more different forms of an element Allotropes of oxygen: O 2 , O 3 (ozone) I Ozone is made in electrical discharges, and by photochemical reactions Allotropes of sulfur: rings: S 6 , S 7 , S 8 , S 9 , S 10 , S 11 , S 12 , S 18 , S 20 ; long chains; S 2 I S 8 is the most common solid form (often shown as S in thermodynamic tables or reactions) I S 2 is only observed in the gas phase at high temperatures
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Ozone I Production in the ozone layer (25–35 km above surface): O 2 + h ν O + O O 2 + O + M O 3 + M (M is a third body, i.e. molecule or particle, that carries away the excess energy from this reaction.) I Production at ground level due to NO 2 (from internal combustion engines): NO 2 + h ν NO + O O 2 + O + M O 3 + M I Formation of NO 2 assisted by volatile organic compounds (often uncombusted fuels)
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  • Fall '06
  • Marc
  • Chemistry, Sulfur, Electronic Attraction, Cl degrades ozone

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