Given the reaction that occurs in an electrochemical cell:

Zn (s) + CuSO4 (aq) ZnSO4 (aq) + Cu (s)

During this reaction, the oxidation number of Cu changes from

A) 0 to + 2

B) 0 to - 2

C) + 2 to 0

D) - 2 to 0

Balance the Equation Fe3O4 + O2 = Fe3O4

What is ph of a solution

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