Your classmate is correct because this reaction illustrates a redox process where zinc (Zn) is oxidized and loses electrons, while copper ions (Cu²⁺) in copper sulfate are reduced and gain electrons to form solid copper (Cu). In a galvanic cell, an oxidation-reduction reaction occurs spontaneously, generating electrical energy. The flow of electrons from the zinc electrode (anode) to the copper electrode (cathode) is what produces the electric current. Additionally, the movement of ions in the electrolyte (copper sulfate solution) supports the overall cell reaction, further illustrating the principles of a galvanic cell

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In this reaction, zinc (Zn) is oxidized, losing electrons, while copper ions (Cu²⁺) are reduced, gaining electrons to form solid copper (Cu). This redox process occurs spontaneously in a galvanic cell, generating electrical energy through the flow of electrons from the zinc anode to the copper cathode. The movement of ions in the copper sulfate electrolyte also contributes to the overall cell reaction.