Question

what element is undergoing oxidation in the following reaction Zn(s)+2AgNO3(aq)->Zn(NO3)2(aq)+2Ag(s)

Answer 1

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First break down any aqueous reactants and products into ions.
Next remove the spectator ions (things that are on both side of the arrow)

Now you have the net ionic equation.
You can see which of the 2 elements is undergoing oxidation because with oxidation, the element loses electrons

You can also write down the half equations to see which one loses electrons.
An oxidation halfreaction would look like this: reductant \(\to\) product + \(e^-\)