Electrochem

Question 1

List Positives of Fuel cells

Answer 1

More efficient than direct combustion
Low RUNNING costs
Less emissions of S and N containing compounds
Quiet

Question 2

List Negatives of Fuel cells

Answer 2

Storage and safety of fuel
Expensive to MANUFACTURE
Potentially less efficient/convenient than batteries

Question 3

What Voltage required to recharge a secondary cell

Answer 3

The V generated by the power supply must be greater than the potential difference for the 2 reactions. However not too high or other side reactions will occur.

Question 4

H2 storage considerations

Answer 4

Low ignition point + highly flammable
Colourless and odourless = difficult to detect
Must undergo considerable compression and withstand the extreme pressures required

Question 5

What is the purpose of the electrolyte?

Answer 5

Balance a build of charge within the cell.

Question 6

What can impact the cells function

Answer 6

Change in temperature
Higher or lower than 1M
Conditions and experimental design

Question 7

Potential impacts of changes

Answer 7

Rate too slow = not observe
Another product may form at electrode
Different voltage produced