electrode potentials Flashcards
1
Q
conditions if a cell is connected to a standard hydrogen electrode ?
A
temp- 298k
all conc- 1moldm^3
all pressure- 100kpa
2
Q
if there is a large voltage what does it mean for the equilib
A
RIGHT
3
Q
if small voltage what mean for equilib
A
LEFT
4
Q
why is KNO3 a suitable salt bridge?
A
KNO3 is unreactive
has ions free to move so can carry current
5
Q
whats voltage of standard hydrogen half cell
A
0
6
Q
the only thing to effect the e.m.f
A
conc of reactants
pressure
temp
7
Q
in acidic solutions whats not going to be in any equation
A
H+
8
Q
half equations in hydrogen-oxygen fuel cell
A
- at the anode - H2(g) => 2H+(aq) + 2e-
- at the cathode O2(aq) + 4H+(aq) + 4e- => 2H2O(l)
9
Q
all the species on the left of the arrow are ?
A
oxidising agents
10
Q
all species on the right of the arrow are ?
A
reducing agents
11
Q
y might a current produced by a cell fall to zero after some time?
A
all the reactants are used up
