Electrochemistry

Question 1

Electrolyte

Answer 1

Compound that will conduct an electric current when it is in aqueous solution is in molten sate

Question 2

Strong electrolyte

Answer 2

Fully ionised in an aqueous solution (all ionic compounds are strong electrolytes)

Question 3

Weak electrolytes

Answer 3

Partially ionises in an aqueous solution (H₂O, NH₃, most organic acids and bases)

Question 4

Factors affecting electrode potential

Answer 4

• Temperature
• Concentration of ions in aqueous solution
• Partial pressure of any gas involved in reaction

Question 5

E^ϴ, standard electrode potential

Answer 5

E^ϴ of a half cell is the emf, measured at 298K, between the half cell and the S.H.E. in which the concentration of any reacting species in the solution is 1 moldm³, and any gaseous species is at pressure of 1 bar

Question 6

ΔG formula

Answer 6

ΔG = -nFE

n = no. of electrons transfer
F = 96500 (Faraday’s constant)
E = E cell

Question 7

Q formula

Answer 7

Q = It

Q = charge in C
I = current in A
t = time in seconds

Question 8

Q formula

Answer 8

Q = n_eF

n_e = amount of electrons in mol
F = 96500 (Faraday’s constant)

Question 9

F formula

Answer 9

F = Le

F = 96500 (Faraday’s constant)
e = charge on an electron