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

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

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 reversible Daniell cell is made from a zinc electrode in Zn2+ and a copper electrode in Cu2+. The standard electrode potentials are: Zn2+ + 2e- ? Zn(s) E° = -0.76 V; Cu2+ + 2e- ? Cu(s) E° = +0.34 V. What is the standard emf of the cell (Cu as cathode, Zn as anode)?

Which statement about fuel cells is correct?

Which overall reaction describes a proton exchange membrane (PEM) hydrogen fuel cell using hydrogen and oxygen?

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

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

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

A student needs to identify whether a small cell uses a metal/metal-ion redox pair or a fuel cell using H2/O2. Which simple observation would indicate the cell is a fuel cell (H2/O2)?

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?

Which of the following is a correct disadvantage of fuel cells compared with conventional internal combustion engines?