Deck 5: Electrochemical Potential and Free Energy

Question 1

The ter m in th e e lec tro ch em ica l po ten tial th at d es cr ibe s th e c on ce ntr atio n w or k is

A) µ0
B) RT ln C
C) RT C
D) z; ¡ 6x

Answer 1

B

Question 2

At equilibrium

A) 6 G = 0
B) 6 G < 0
C) 6 G = RT ln K
D) 6µ = RT ln C
E) Both A and C are correct

Answer 2

A

Question 3

At 1 a tm pres sur e, the electr och em ical po tential, of a solute in solu tion, µ

A) Is th e G ibb s F re e e ne rg y pe r m ole cu le
B) = RT ln C + z ; ¡ (whe re R is the g as c ons tant, T is tem pera ture, ; is the Faraday and ¡ is th e e lec tric al p ote ntia l)
C) = µ o + RT ln C + z ; ¡
D) Is zero at equilibrium
E) Both A and C are correct

Answer 3

C

Question 4

If a process has 6 G

A) The reverse p rocess will occu r spon taneo usly.
B) It w ill oc cu r s po nta ne ou sly
C) It will not occur spontaneously unless linked to another process with 6 G
D) It will not occur spontaneously unless linked to another process with 6 G
E) It ca n n ev er oc cu r s po nta ne ou sly

Question 5

The "free energy" is

A) The energy liberated upon breaking a chemical bond
B) The en ergy a vailab le to do w ork
C) All energy except thermal energy
D) The energy liberated when a solution is concentrated
E) Zero at equilibrium

Question 6

The units of the electrochem ical potential are

A) Vo lts
B) Joules
C) Jo ule s p er m ole
D) Kcal
E) Both A and C

Question 7

The ter m in th e e lec tro ch em ica l po ten tial th at d es cr ibe s th e e lec tric al w or k is

A) µ0
B) RT ln C
C) RT C
D) z; ¡ 6x

Question 8

A charged solute is subjected to an electric field that accelerates the charge. It soon reaches a ter m ina l ve loc ity, v. If the for ce pe r un it pa rtic le is f, w ha t is th e fin al v elo city?

A) v = D / kT f
B) v = kT C f
C) v = kT / D f
D) v = RTlnC
E) v = -D 6C /6x

Question 9

W hat would happen to the free energy of ATP hydrolysis if the [ADP] and [Pi] concentrations rose ins ide the ce ll?

A) 6 G for AT P hydrolysis would bec om e m ore negative
B) You couldn't tell what would happen because the effects oppose one another
C) 6 G for AT P hydrolysis would bec om e positive
D) 6 G for ATP hydrolysis would become less negative
E) 6 G for AT P hydrolysis would bec om e m ore positive

Question 10

W hen a s olu tion of c ha rg ed pa rtic les is s ub jec t to a n e lec tric field, the force on a charged particle due to th e e lec tric field is (z is the number of charges on the particle; e is the charge on th e elec tron; E is the e lectric fie ld inten sity; k is B oltzm ann 's co nsta nt; T is the te m pera ture; D is th e diffusion coe fficien t; C is the con cen tration; ; is the F arad ay; ¡ is the p oten tial; R is the gas con stan t)

A) zeE
B) kT /D
C) zCe
D) ;d¡ /dx
E) RT ln C

Question 11

If a process has 6 G

A) It will not occur spontaneously unless linked to another process with 6 G
B) It w ill oc cu r s po nta ne ou sly
C) It will not occur spontaneously unless linked to another process with 6 G
D) It will not occur spontaneously unless linked to another process with 6 G
E) It ca n n ev er oc cu r s po nta ne ou sly

Question 12

At equilibrium, for the reaction A + B ·
C , it is possible to calculate 6 G 0 as

A) -RT ln [C] /[A][B]
B) -RT [C] / [A][B]
C) -RT/ ln Keq
D) Ln Keq / RT
E) 6 G 0 is measured, not calculated