Electrode potentials and Fuel Cells

Question 1

standard electrode potentials of a half cell

Answer 1

the emf of a half cell compared with the standard hydrogen half cell;
Hydrogen with 100kPa of pressure
298K
1moldm^-3 concentration of hydrogen ions

Question 2

what are fuels scientists in the car industry develop?

Answer 2

Hydrogen gas fuel

hydrogen rich fuels

Question 3

What are the limitations of predicting using standard cell potentials

Answer 3

non-standard conditions mean expected results may not occur

reactions may not be feasible If there aren’t standard conditions

Question 4

What are the limitations of predicting using standard cell potentials

Answer 4

non-standard conditions mean expected results may not occur

reactions may not be feasible If there aren’t standard conditions

Question 5

Advantages of using fuel cells to produce energy

Answer 5

H-O only produces water as a product meaning there are no greenhouse pollutions given off although generating the H produces a small amount of CO2 it is a lot less than combustion
fuel cells are around 30% more efficient

Question 6

limitations of fuel cells

Answer 6

hydrogen gas is very flammable with a low boiling point so its difficult to store and to transport
it can be store under high presser or adsorbed on to the surface of a metal but this is expensive
fuel cells use toxic chemicals in their manufacture
fuel cells have a limited life time

Question 7

if cell potentials are kinetically stable what does this mean

Answer 7

the reaction has a high activation energy meaning a reaction occurs very slowly at room temperature