EGEE 420 ALL 2027 TEST SET ANSWERS AND
QUESTIONS SET A+
✔✔What is the cell potential difference (E) of the Daniell cell (at 2C) if activities of An
and Cu are, respectively, 0.1 and 0.01? - ✔✔1.072
E=Eo-(RT/nF)ln(ai/aj)
✔✔Estimate the standard Gibbs energy, (delta,r,G) of reaction of decomposition of
liquid water to gaseous H and O at 25C and 1 bar. - ✔✔+237.141 kJ/mol
✔✔Oxidation is____.
-release of e- in half-rxn
-gathering of electrons in half-rxn
-release of p+ in half-rxn - ✔✔release of electrons in half-rxn
✔✔activity of a solute in an aqueous solution is defined as:
-activity coeff times partial pressure
-activity coeff times mole fraction
-activity coeff time molality - ✔✔activity coefficient time molality
✔✔a galvanic electrochemical cell produces:
-chemicals using electricity
-electricity using chemicals
-either chemicals or electricity - ✔✔electricity using chemicals
✔✔Based on the IUPAC recommendation, the potential difference of the cell
Cu(s)|CuSO4||ZnSO4|Zn|Cu should be calculated as: - ✔✔E = (RT cell) - (LFT cell)
E = E(Zn2+/Zn) - E(Cu2+/Cu)
✔✔Calculate the standard electrode potential difference (Eo) of the Daniell cell (25C) if
pressure is 500MPa. - ✔✔>Find. deltaV.r.o & deltaG.r.o
>Eo = G.r.o/(vF)
, 1.099V
✔✔Using the handbook data, calculate the standard electrode potential of the O2 gas
electrode at 1.014 bar and 100C - ✔✔1.167 V
✔✔In a galvanic cell, the electric potential____.
-of the cathode is the same as the electric potential of the anode
-of the anode is more positive than the electric potential of the cathode
-of the cathode is more positive than the electric potential of the anode - ✔✔of the
cathode is more (+) than the electric potential of the anode
✔✔What is the electron number in an electrochemical rxn written H2(g) +O2(g) =
2H2O(l)? - ✔✔4
✔✔The galvanic cell anode is___.
-the negative electrode
-either positive or negative electrode
-the positive electrode - ✔✔the negative electrode
✔✔H2=2H+ (+) 2e- is:
-an oxidation
-reduction
-both - ✔✔oxidation
✔✔The IUPAC convention is that the cell potential difference is:
-the right-hand potential minus the left-hand potential
-the left-hand potential minus the right-hand - ✔✔the right-hand potential minus the left-
hand potential
✔✔The Nernst's equation the standard electrode potential depends on:
-temperature
-concentration scales chosen for activities
-both of these - ✔✔both of these
✔✔What's the standard electrode potential of the Zn/Zn2+ electrode? - ✔✔- 0.762 V
✔✔Calculate the standard electrode potential difference (Eo) of the Daniell cell (1 bar) if
T=473.15K - ✔✔1.088 V
✔✔Using Handbook data, calculate the standard electrode potential difference (Eo) of a
fuel cell, which consumes hydrogen and oxygen and produces gaseous water at 1000 K
and 1 bar. - ✔✔0.998 V
QUESTIONS SET A+
✔✔What is the cell potential difference (E) of the Daniell cell (at 2C) if activities of An
and Cu are, respectively, 0.1 and 0.01? - ✔✔1.072
E=Eo-(RT/nF)ln(ai/aj)
✔✔Estimate the standard Gibbs energy, (delta,r,G) of reaction of decomposition of
liquid water to gaseous H and O at 25C and 1 bar. - ✔✔+237.141 kJ/mol
✔✔Oxidation is____.
-release of e- in half-rxn
-gathering of electrons in half-rxn
-release of p+ in half-rxn - ✔✔release of electrons in half-rxn
✔✔activity of a solute in an aqueous solution is defined as:
-activity coeff times partial pressure
-activity coeff times mole fraction
-activity coeff time molality - ✔✔activity coefficient time molality
✔✔a galvanic electrochemical cell produces:
-chemicals using electricity
-electricity using chemicals
-either chemicals or electricity - ✔✔electricity using chemicals
✔✔Based on the IUPAC recommendation, the potential difference of the cell
Cu(s)|CuSO4||ZnSO4|Zn|Cu should be calculated as: - ✔✔E = (RT cell) - (LFT cell)
E = E(Zn2+/Zn) - E(Cu2+/Cu)
✔✔Calculate the standard electrode potential difference (Eo) of the Daniell cell (25C) if
pressure is 500MPa. - ✔✔>Find. deltaV.r.o & deltaG.r.o
>Eo = G.r.o/(vF)
, 1.099V
✔✔Using the handbook data, calculate the standard electrode potential of the O2 gas
electrode at 1.014 bar and 100C - ✔✔1.167 V
✔✔In a galvanic cell, the electric potential____.
-of the cathode is the same as the electric potential of the anode
-of the anode is more positive than the electric potential of the cathode
-of the cathode is more positive than the electric potential of the anode - ✔✔of the
cathode is more (+) than the electric potential of the anode
✔✔What is the electron number in an electrochemical rxn written H2(g) +O2(g) =
2H2O(l)? - ✔✔4
✔✔The galvanic cell anode is___.
-the negative electrode
-either positive or negative electrode
-the positive electrode - ✔✔the negative electrode
✔✔H2=2H+ (+) 2e- is:
-an oxidation
-reduction
-both - ✔✔oxidation
✔✔The IUPAC convention is that the cell potential difference is:
-the right-hand potential minus the left-hand potential
-the left-hand potential minus the right-hand - ✔✔the right-hand potential minus the left-
hand potential
✔✔The Nernst's equation the standard electrode potential depends on:
-temperature
-concentration scales chosen for activities
-both of these - ✔✔both of these
✔✔What's the standard electrode potential of the Zn/Zn2+ electrode? - ✔✔- 0.762 V
✔✔Calculate the standard electrode potential difference (Eo) of the Daniell cell (1 bar) if
T=473.15K - ✔✔1.088 V
✔✔Using Handbook data, calculate the standard electrode potential difference (Eo) of a
fuel cell, which consumes hydrogen and oxygen and produces gaseous water at 1000 K
and 1 bar. - ✔✔0.998 V
