Chemical Cells And Fuel Cells (chemistry Only) (GCSE Chemistry)

A car fuel cell stack gives lower voltage under heavy load. Which reason explains the drop?

Which advantage of a hydrogen fuel cell (using H2 and O2) compared with burning hydrogen in an engine is correct?

In a fuel cell using an alkaline electrolyte, which ions move through the electrolyte from the cathode to the anode?

Which change to a galvanic cell will NOT alter the equilibrium cell potential (E°) but can change the measured terminal voltage under load?

Which half-equation correctly represents the oxidation that occurs at the anode in a hydrogen–oxygen fuel cell (acid electrolyte)?

A simple electrochemical cell notation is: Zn(s) | Zn2+(aq) || Cu2+(aq) | Cu(s). Which electrode is the cathode?

Which statement about internal resistance in a cell is true?

Which statement about fuel cells is correct?

Which calculation correctly gives the electrical energy (in joules) delivered by a cell of emf 1.2 V supplying 2.0 A for 30 s?

A fuel cell produces 150 kJ of electrical energy for each 200 kJ of chemical energy in the hydrogen fuel consumed. What is the efficiency (electrical energy output / chemical energy input) expressed as a percentage?

A student places a voltmeter across a fuel cell and observes 0.65 V under load, but the open-circuit voltage (no load) is 0.75 V. Which is the most likely cause of the 0.10 V difference?