Galvanic cell setup Flashcards
Define: galvanic cell
type of cell in which chemical energy is converted to electrical energy
is a galvanic cell a type of primary cell?
yes
can galvanic cells be either portable or fixed?
yes
Define: electrode
solid conductor in each half cell, in which oxidation or reduction occurs.
Define: anode
electrode in which oxidation occurs
Define: cathode
electrode in which reduction occurs
Define: half cell
beakers containing electrodes, and a solution. It contains a conjugate redox pair, and often spectator ions in the solution.
Describe the 3 main types of solutions
Metal electrode inert electrode (platinum/graphite)
Describe gas electrode
porous inert electrode in a glass tube, in which gas is pumped.
What are inert electrodes used for?
for conjugate redox pairs that don’t have metals Br2(l)/Br-(aq) and Fe3+(aq)/Fe2+(aq)
Gas electrode:
Can Fe have an equation that does involve a solid, and one that doesn’t?
YES
What electrode has negative polarity?
Where the electrons comes rom
Define: external wiring
Wiring connecting the 2 electrodes
Direction of electron flow?
From the anode (oxidised so loses electrons) to cathode (reduced so gains electrons)
Define: voltmeter
instrument that measures the potential difference between two points in a circuit
Define: salt bridge
filter paper soaked with ions that are freely moving, and relatively unreactive in that they don’t form precipitates (usually KNO3)
purpose of the salt bridge?
o Salt bridge prevents charges from accumulating in the electrodes, as this would prevent the reaction from continuing. Positive cations flow towards the cathode, which gains electrons and becomes more negative. Hence charges are prevented from accumulating.
Galavanic cell is aka
voltaic cell
Define: battery
combination of cells connected in a series
