use the redox reactions to answer the question.
Zn + 2H+ --> Zn2+ + H2
2Ai + 3Cu2+ --> 2Ai3+ +3cu
Which elements are oxidized?
In the first reaction:
Zn is oxidized from 0 to +2 (it loses two electrons).
In the second reaction:
Cu is oxidized from +2 to +3 (it loses one electron).