Lecture 4 - Stoichiometry and Bacterial Energetics

Question 1

oxidation

Answer 1

the removal of electron from a substance

Question 2

reduction

Answer 2

the addition of electrons to a substance

Question 3

reduction potential

Answer 3

the tendency for a substance to become more oxidized or reduced

Question 4

Eo

Answer 4

reduction potential under standard conditions

25 degrees C, 1 atm, and 1 M

Question 5

Eo’

Answer 5

reduction potential under standard conditions
(25 degrees C, 1 atm, and 1 M)

pH 7

Question 6

ΔEo

Answer 6

the difference in reduction potential between two couples

Question 7

ΔGo’

Answer 7

ΔGo’
Gibbs free energy change under standard conditions (25 degrees C, 1 atm, and 1 M)

pH 7

Question 8

redox couple

Answer 8

species on each side of such alf reactions represent a redox couple

2H+/H2
0.5O2/H2O

The OXIDIZED form of the redox couple is on the LEFT.

The REDUCED form of the redox couple is on the RIGHT.

Question 9

What information can be obtained from the Eo’ of a redox couple?

Answer 9

Electrons are transferred from the species on the RIGHT of the DONATING redox couple to the LEFT of the ACCEPTING redox couple.

Question 10

Describe the structure of the electron tower.

Answer 10

Redox couples with more NEGATIVE Eo’ at the top; are good electron DONORS on the RIGHT of couple.

Redox couples with more POSITIVE Eo’ at the bottom; are good electron ACCEPTORS on the LEFT of couple.