CH-1690
Simple cells
Chemistry · Secondary 4 · Hard · Simple cells
In an experiment, dilute sulfuric acid is electrolysed using two identical graphite electrodes. The bulb in the circuit glows brightly. The student then replaces one graphite electrode with a strip of copper metal. The bulb now glows dimmer. Which statement best explains this change?
- The copper electrode decreases the potential difference, so less current flows.
- The copper electrode increases the resistance of the circuit, so more current flows.
- The copper electrode removes all ions from solution, so no current flows.
- The copper electrode doubles the ion concentration, so the bulb should be brighter.
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