Electrochemistry Flashcards
Which side is the more negative electrode placed on?
The right
How is Ecell calculated?
EL - ER
What is the definition of electrode potential?
The potential difference of an electrode relative to a standard hydrogen electrode under standard conditions.
Why is a platinum electrode used when the electrolyte is a combination of two metal ions?
It is inert
What is the purpose of the salt bridge?
It maintains the ionic balance, and it completes the circuit.
What salt is usually used for the salt bridge?
KNO3 potassium nitrate, as this salt is unreactive.
What is the colour change between Fe2+ and Fe3+?
green to orange/brown
What is the colour change for Cr2O72- to Cr3+?
Orange to green
What is the colour change for Cu2+ to Cu+?
Blue to colourless.
General pros and cons of using cells
+Portable source of electricity
- Issues with waste
Pros and cons of non-rechargeable cells
+Cheap
-Waste issues
Pros and Cons of using rechargeable cells
+Less waste
+Cheaper in the long run
+Lower environmental impact
- Still some waste issues
Using hydrogen fuel cells pros and cons
\+ Only waste product is water \+Do not need recharging \+Very efficient -Need constant fuel supply -Hydrogen is flammable and explosive -Hydrogen is usually made using energy from fossil fuels -Fuel cells are expensive
