Redox reactions

Redox reactionsways to identifyredox reactionsoxidation statesoxidation numbersloss of electronsgain of oxygenincrease in oxidation stateoxidationgain of electronsloss of oxygendecrease of oxidation statereductionterm used when electrons are transferred,strictly used for ionic compoundsloss of electronsoxidation has occurredgain in electronsreduction has occurredoxidation state has increasedoxidation state has decreasedterm used for covalent moleculeswhere electrons are shared in thecovalent bondexamples of molecules where oxidation state is usedHClH2Owhat is oxidation number?a value assigned to a each atom in a compounda measure of the electron control it has, relative to the atomPauling's Scaling of Electronegativityelectronegativitya measure of an atom's abilityto attract electronsincreases from left to rightin the periodic tabledue to the increase innuclear charge, resulting in an increased attraction between nucleus and bond electrons6 rules for assigning oxidation numbers1. atoms in elemental stateatoms in leemental state have an oxidation state of 02. Simple ionsOxidation number is the same as thecharge for simple ions3. addition of all oxidation numbersin a neutral compoundall oxidation numbers in a neutral compoundmust add up to 04. addition of all oxidation numbers in a charged compound addition of all oxidation numbers in a charged compound must add up to the chargeof the compound5. usual oxidation numberfor an elementusual oxidation number of anelement is equal to its charge6. Exceptions to rule 5some elements' oxidation numbers can changedue to the other elements in the compound