Chapter 12 - Electrochemistry

Question 1

Do galvanic cells have pos or neg free energy / electromotive force?

Answer 1

∆G = negative
EMF = positive

Question 2

What direction does current flow?

Answer 2

Cathode to anode

e- from anode to cathode

Question 3

What is the difference between galvanic and electrolytic cells?

Answer 3

Electrolytic:
- nonspontaneous
- electrolysis (external voltage source)
-

Question 4

Électrodéposition equation

Answer 4

Moles of Metal, It (is) Not Fun

Mol M = It/nF

Question 5

Concentration cells , what is they?

Answer 5

Type of galvanic cell
[ ] gradients result in potential difference

V= 0 when [ ] are equal

Calculated using Nernst

**resting membrane potential calculations

Question 6

EquATION FOR STANDARD EMF

Answer 6

Ecell = Ered, cat - Ered,anode

Question 7

Equation to related free energy and emf

Answer 7

∆Gº = -nFEºcell

Question 8

When do you use Nernst ?

Answer 8

When conditions deviate from standard conditions

Ecell = Eºcell - RT/nF (lnQ)

Question 9

What is the simplified MCAT style Nernst equation?

Answer 9

Ecell = Eºcell - (0.0592/n)logQ

Question 10

Fwhat is the relationship between Keq and Eºcell?

Answer 10

Keq > 1 , + Ecell
Keq < 1, - Ecell
Keq = 0 Ecell = 0