CHEM 1120 Exam 4 Study Guide – Complete Review (ECU Chemistry 2026)
Electrochemistry - correct answer ✔✔the study of redox reactions that produce or require an
electric current
Electrochemical Cell - correct answer ✔✔chemical energy is converted to electrical energy
Where do spontaneous redox reactions take place? - correct answer ✔✔voltaic (or galvanic) cell
OIL RIG - correct answer ✔✔oxidation is loss, reduction is gain
Oxidation number - correct answer ✔✔the charge an atom would have if electrons where
transferred completely
Oxidation number rules - correct answer ✔✔1. Free elements = 0
2. Monatomic ions have a state equal to their charge
How to balance Redox reactions - correct answer ✔✔first balance elements other than H and O
add H2O where O is needed
Add H+ where H is needed
if the reaction is done in a base, add OH- to neutralize H+
balance charge by adjusting electrons
balance electrons between half reactions
Cell Potential (Ecell) - correct answer ✔✔difference in electrical potential energy between
anode and cathode
depends on nature, concentration, and temperature of the electrodes and ions in solution
, E0 - correct answer ✔✔standard reduction potential at 1 M and where pressure is 1 atm
don't multiply by stoichiometry
Cathode - correct answer ✔✔more positive E0 value, will be reduced
Anode - correct answer ✔✔more negative E0 value, will be oxidized
Predicting Spontaneity of Redox Reactions - correct answer ✔✔when E0 is positive, it's
spontaneous
when E0 is negative, it's nonspontaneous
ΔG0 - correct answer ✔✔= -nFE0cell
=-RTlnK
n- number of moles
F- Faraday constant 96500 C/ mol e-
E0cell= - correct answer ✔✔RT/nF(lnK)
R- gas constant 8.314 J/ mol K
E0cell, ΔG0, and K - correct answer ✔✔for a spontaneous reaction,
ΔG is negative
E0 is positive
Electrochemistry - correct answer ✔✔the study of redox reactions that produce or require an
electric current
Electrochemical Cell - correct answer ✔✔chemical energy is converted to electrical energy
Where do spontaneous redox reactions take place? - correct answer ✔✔voltaic (or galvanic) cell
OIL RIG - correct answer ✔✔oxidation is loss, reduction is gain
Oxidation number - correct answer ✔✔the charge an atom would have if electrons where
transferred completely
Oxidation number rules - correct answer ✔✔1. Free elements = 0
2. Monatomic ions have a state equal to their charge
How to balance Redox reactions - correct answer ✔✔first balance elements other than H and O
add H2O where O is needed
Add H+ where H is needed
if the reaction is done in a base, add OH- to neutralize H+
balance charge by adjusting electrons
balance electrons between half reactions
Cell Potential (Ecell) - correct answer ✔✔difference in electrical potential energy between
anode and cathode
depends on nature, concentration, and temperature of the electrodes and ions in solution
, E0 - correct answer ✔✔standard reduction potential at 1 M and where pressure is 1 atm
don't multiply by stoichiometry
Cathode - correct answer ✔✔more positive E0 value, will be reduced
Anode - correct answer ✔✔more negative E0 value, will be oxidized
Predicting Spontaneity of Redox Reactions - correct answer ✔✔when E0 is positive, it's
spontaneous
when E0 is negative, it's nonspontaneous
ΔG0 - correct answer ✔✔= -nFE0cell
=-RTlnK
n- number of moles
F- Faraday constant 96500 C/ mol e-
E0cell= - correct answer ✔✔RT/nF(lnK)
R- gas constant 8.314 J/ mol K
E0cell, ΔG0, and K - correct answer ✔✔for a spontaneous reaction,
ΔG is negative
E0 is positive
