Electrode Potentials & Electrochemical cells Flashcards
Why is platinum used as an electrode?
As it is inert (unreactive) and electrically conductive
What are the standard conditions of the standard hydrogen electrode?
Concentration - 1moldm-3
Temperature - 298K
Pressure - 100KPa
What side is hydrogen always on a cell diagram?
Left hand side
What will the electrode potential be when the negative electrode is on the left and positive is on the right?
Positive
What will the electrode potential be when the negative electrode is on the right and positive is on the left?
Negative
How is a cell diagram written?
Reduced form|Oxidised form||Oxidised form|reduced form
What does two lines mean on a cell diagram?
Salt bridge
What does one line on a cell diagram mean?
Physical state change
In terms of standard electrode potentials which values are more reactive?
More negative
What does the standard electrode potential show about the position of equilibrium?
The more positive the further it is to the right
What do all feasible reaction have in terms of electrode potentials?
Positive value
What are the three types of commercial cells?
-Non rechargeable (irreversible reaction)
-Rechargeable (reversible reaction)
-Fuel cells (generate electricity)
Give an example of a non rechargeable cell?
Zinc-Carbon cell
What are the advantages & disadvantages of zinc-carbon cells (non-rechargeable cells)?
-cheap to produce
-short life
Give an example of a rechargeable cell?
Lithium ion (Li-ion)
