QUESTION ONE (a) What are concentration cells? Describe and discuss an electrolyte
concentration cell without transference
1101
(b) Calculate the EMF of the electrode concentration cell
121
PL Halpu). HCI. Hapa): Pt at 25°C if p = 600 torr and p2 = 400 torr
(c) Predict whether the following reaction would proceed spontaneously as
written at 298 K
Cd(s)
Fe (aq)
Cd2(aq)
Fe(s)
Given that [Cd?'y = 0.15M and [Fe2+] = 0.68M
The standard reduction potentials of cadmium and iron are -0.403 and -0.447
volts respectively
[3]
(d) Explain reversible cell? Name the different types of reversible cell (5)

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.