Identifying oxidation and reduction

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How to identify if elements are oxidized or reduced

1. Identify the reactant oxidized and reactant reduced in each of the following reactions:

(a). Pb(s)+Cu(NO3)2(aq)→Cu(s)+Pb(NO3)2(aq)

(b). 2Mg(s)+O2(g)→2MgO(s)         

oxidation and reduction reactions

 

MgO oxidation and reductuion

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