Oxygen and Oxidation Essay

1569 Words Nov 3rd, 2010 7 Pages
OXIDATION AND REDUCTION
Oxygen makes up only about 20% of the air, yet is the essential component for so many reactions. Without it fuels would not burn, iron would not rust and we would be unable to obtain energy from our food molecules through respiration. Indeed animal life on the planet did not evolve until a certain concentration of oxygen had built up in the atmosphere over 600 million years ago. The term oxidation has been in use for a long time to describe these and other reactions where oxygen is added. Oxidation, though, is only half of the story, as it is always accompanied by the opposite process reduction, which was originally thought of in terms of loss of oxygen. Later, however the terms widened to include a much broader
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Oxides

Basic or metallic oxides = They are formed by the combination of a metal with oxygen. metal + oxygen Metal oxide (basic oxide) 2 Cu + O2 2 CuO Na2O - sodium oxide , CaO - calcium oxide --------------------------------------------------------------------------------------------------------------------------------Acid or non-metallic oxides = They are formed by the combination of a non-metal with oxygen. non-metal + oxygen Non-metal oxide (acid oxide) C + O2 CO2 N2O - dinitrogen oxide , N2O5 - dinitrogen pentaoxide Also called Bases = They are formed by the combination of a basic oxide (metallic) with water (H2O). basic oxide + water Hydroxide Hg2O + H2O 2 HgOH (Radical OH is always bond to the metal in the formula) NaOH - sodium hydroxide , Ca(OH)2 - calcium hydroxide Hydride = They are formed by the combination of hydrogen with metals from groups 1 and 2. metal + hydrogen Hydride 2 K + H2 2 KH (Hydrogen always has a negative -1 valence). NaH - sodium hydride , CaH2 - calcium hydride Hydracids = They are formed by the combination of hydrogen with a non-metal (it doesn’t have Oxygen in the molecule). non- metal + hydrogen Hydracid

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