When potassium hydroxide is combined with _______, the chemical reaction promotes current flow in the presence of an applied voltage.

Question

BlackTom AI · Accepted Answer

In electrochemical systems, an electrolyte like potassium hydroxide (KOH) enables ions to move between electrodes, allowing current to flow when an external voltage is applied.
Option considered: 'nickel and cadmium plates'. In a nickel-cadmium (NiCd) battery, the electrodes are nickel and cadmium, and the electrolyte is typically a concentrated KOH solution. This combination supports the redox reactions at the electrodes and permitting electron flow through the external circuit when a voltage is applied.
To understand why this pairing works: the electrolyte provides charge carriers (ions) to balance charge as reactions occur at the electrode surfaces, while the electrode materials determine the specific redox couples and potential differences driving the current.
If we imagined alternative, non-existent options in this question, they would be evaluated similarly by asking whether the electrolyte (KOH) with the given electrode materials would support ion conduction and electron transfer under an applied voltage; however, since the question provides nickel and cadmium plates as the pairing, this setup aligns with a classic NiCd battery configuration that uses KOH as the electrolyte to promote current flow when voltage is applied.

When potassium hydroxide is combined with _______, the chemical reaction promotes current flow in the presence of an applied voltage.单项选择题

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