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

A student connects two identical cells in series. What happens to the total emf and the available current (assuming internal resistances are small)?

A student compares an H2–O2 fuel cell with a hydrogen combustion engine. Which correct environmental advantage does the pure H2–O2 fuel cell have?

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

Which statement about catalyst use in fuel cells is correct?

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?

Standard hydrogen electrode (SHE) is used as the reference electrode with potential defined as 0.00 V. Which half-reaction is used for SHE?

In a hydrogen fuel cell using a polymer electrolyte membrane, what is the role of the membrane?

Which statement about fuel cells is correct?

A hydrogen fuel cell is used to power a device; if the hydrogen feed is contaminated with carbon monoxide (CO), what is a likely effect?

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

Which fuel cell type typically requires a platinum catalyst and operates at relatively low temperatures (e.g., ~80 °C)?