AP Chemistry
9.9 Cell Potential and Free Energy
9.8 Galvanic (Voltaic) and Electrolytic Cells
Strips of four different unknown metals, \(W\text{(s)}\), \(X\text{(s)}\), \(Y\text{(s)}\), and \(Z\text{(s)}\), were cleaned and placed into separate test tubes containing \(1.0 \text{ M}\) aqueous nitrate solutions of each metal ion at \(298 \text{ K}\). The observations are recorded in the table below.
Based on the experimental data, which of the following correctly ranks the metal ions from weakest to strongest oxidizing agent and identifies the electrodes of a standard galvanic cell constructed from these half-cells that will produce the greatest positive cell potential, \(E^\circ_{\text{cell}}\)?
| Metal strip | \(W^{2+}\text{(aq)}\) | \(X^{2+}\text{(aq)}\) | \(Y^{2+}\text{(aq)}\) | \(Z^{2+}\text{(aq)}\) |
|---|---|---|---|---|
| \(W\text{(s)}\) | — | Reaction | Reaction | Reaction |
| \(X\text{(s)}\) | No reaction | — | No reaction | Reaction |
| \(Y\text{(s)}\) | No reaction | Reaction | — | Reaction |
| \(Z\text{(s)}\) | No reaction | No reaction | No reaction | — |
Based on the experimental data, which of the following correctly ranks the metal ions from weakest to strongest oxidizing agent and identifies the electrodes of a standard galvanic cell constructed from these half-cells that will produce the greatest positive cell potential, \(E^\circ_{\text{cell}}\)?
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