Bubbles will form on wires attached to a 9-volt battery placed in water. Which statements correctly describe what is happening?
I. The wire attached to the (-) battery electrode becomes the cathode, and water is being reduced there to produce hydrogen gas.
II. The wire attached to the (+) battery electrode becomes the anode, and water is being oxidized there to produce oxygen gas.
III. The wire attached to the (-) battery electrode becomes the cathode, and water is being oxidized there to produce oxygen gas.
IV. The wire attached to the (+) battery electrode becomes the anode, and water is being reduced there to produce hydrogen gas.

Question

Quizplus · Accepted Answer

In electrolysis, the cathode is the negative electrode where reduction occurs, producing hydrogen gas. The anode is the positive electrode where oxidation occurs, producing oxygen gas.

Bubbles Will Form on Wires Attached to a 9-Volt Battery