What is used to measure the voltage of a simple cell?
High resistance galvinometer
Prevents the flow of current
What is used if there is no solid compound to used as an electrode
Why are platinum electrodes used?
- Good eletrical conductivity
What is the purpose of the salt bridge?
Completes the circuit
What is the setup of the standard hydrogen electrode?
How do fuel cells work?
- Uses hydrogen and oxygen
- Hydrogen split into protons and electrons and electrons flow around the circuit
- At the other side, proton join with oxygen and electrons to form water
What are the benefits of fuel cells?
- They don't need recharging
- Only produce water
What are the downsides to fuel cells?
- Energy is needed to produce hydrogen and oxygen, usually from fossil fuels
- Hydrogen is explosive, creating safety issues with transportation and storage
What is the order of the electrodes in a cell diagram?
Anode || Cathode
SHE || Other electrode
What is the order of the species in a cell diagram?
Least oxidised | Most oxidised || Most oxidised | Least oxidised
How can the direction of a reaction be determined from Eº values?
The couple with the most positive Eº goes as a reduction
A reaction is spontaneous if
Ecell > 0