Describe how a fuel cell converts the chemical energy of hydrogen or methanol directly into electricity, and write the half-equations at each electrode in acidic and alkaline electrolytes as well as the overall reaction.
Tę umiejętność sprawdzają 4 zadania wzorowane na arkuszach IB z lat 2023–2026.
Energy can also be produced by a hydrogen-oxygen fuel cell that uses an aqueous solution of sodium hydroxide as the electrolyte. Hydrogen gas is fed to the anode and oxygen gas to the cathode. (i) Deduce the half-equations for the electrode reactions in this…
Which option describes the electrode reactions in a hydrogen fuel cell with an acidic electrolyte? 2 H2(g) + O2(g) → 2 H2O(l) A. Cathode: hydrogen is oxidized; anode: oxygen is reduced B. Cathode: oxygen is reduced; anode: hydrogen is oxidized C.…
A direct formic acid fuel cell generates electricity by oxidizing formic acid, HCOOH, with oxygen at the two electrodes, shown below as separate half-equations. Anode: HCOOH(aq) → CO2(g) + 2 H+(aq) + 2 e− Cathode:…
Hydrogen iodide is an intermediate in some thermochemical cycles that are being researched as a way of obtaining hydrogen from water without using fossil fuels. Explain why there is great interest in producing hydrogen in this way.
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