Electrochemistry Flashcards
describe faraday’s constant
electric charge carried by one mole of electrons
charge on one electron
1.6 x 10-19 C
describe electrode potential
difference in potential between metal/metal ion system and hydrogen standard electrode in volts
describe standard cell potential
potential difference between two half cells under standard conditions ( - )
what are the standard conditions
1 atm
298K
solutions being 1mol/dm^3
gases 101kpa
purpose of salt bridge
allow ionic balance but no electrons move
what does the electrolyte need to be
inert
which element is at the negative terminal
element with more negative electrode potential
the more positive the electrode potential…
the greater tendency to gain electrons, the electrode more likely to go to right
what is the movement of electrons in cell
positive to negative
what is used as electrode for gas
inert platinum
is the electrode potential more -/+ for an oxidising agent?
oxidising agent loses electrons itself, so reaction is to the left, so more negative
movement of electrons when writing electrode potential reactions
move positive on top
clockwise
what happens when you INCREASE concentration of ion in non standard conditions
(Zn2+ + 2e →
Zn)
equilibrium shifts to right to make more product to lower concentration
electrode potential become more positive
what happens when you DECREASE concentration of ion in non standard conditions (Zn2+ + 2e →
Zn)
equilibrium shifts to left to make more reactant and lower concentration
electrode potential becomes more negative
