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CHEE 477 test 2 Questions and
Answers (100% Correct Answers)
Already Graded A+
change in gibs free energy delta G Ans: change in amount of
energy available for work in a reaction at constant P & T
© 2026 Assignment
-Negative: release of free (exergonic)
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Expert
-Postive: Input of free energy (endergonic)
change in enthalpy (delta H) Ans: change in heat content
reacting system, H reflects number and kinds of chemical
bonds
-Negative: release of heat (exothermic)
-Positive: input of heat (endothermic)
change in entropy (delta S) Ans: change in randomness, by
definition an increase in entropy is positive
-Negative: decrease of entropy (increase order)
-Positive: increase of entropy (order decreases)
For the reaction:
aA + bB → cC + dD
, 2
which equation below is the correct expression for the
equilibrium constant?
A)
([A]a × [B]b)/([C]c × [D]d)
B)
(c × [C] × d × [D])/(a × [A] × b × [B])
© 2026 Assignment
C)
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Expert
([C]c × [D]d)/([A]a × [B]b) Ans: C)
([C]c × [D]d)/([A]a × [B]b)
Which term below refers to an Endergonic system? Ans:
Positive delta G
Which term below refers to an Exothermic system? Ans:
Negative delta H
The degree symbol used with the Gibbs free energy change,
refers to what? Ans: standard conditions
gases are set at 1 atm
solids assigned 1
The prime symbol used with the Gibbs free energy change,
refers to what? Ans: biological conditions
H2O= 55.5 M
, 3
The standard change in Gibbs free energy can be calculated
from the energy of formations of compounds according to
which expression Ans: ΔG° = Σ Gf°products - Σ Gf°reactants
What is the standard change in Gibbs free energy for the
reaction
H2 + NO3- → NO2- + H2O
where the energy of formation is 0, -111.46, -37.7 and -237.19
© 2026 Assignment
kJ/mol for H2, NO3-, NO2- and H2O, respectively Ans: -
163.43
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If the reaction of A +B → C +D, has a standard Gibbs free
Expert
energy change of -10 kJ/mol and C+D → E has a standard
Gibbs free energy change of -20 kJ/mol C, which of the
following is true? Ans: The conversion of A + B to E is -30
kJ/mol A
If the reaction of A +B → C +D, has a standard Gibbs free
energy change of -10 kJ/mol, what is the standard change in
Gibbs free energy of and C+D → A + B? Ans: 10 kJ/mol
when calculating the K°', is it correct to use terms for H2O and
H+concentrations in the expression? Ans: no
Half reactions can be summed as long as? Ans: They each
have been written to the same amount of electron equivalents
(eeq)
Which symbol below refers to an actual change in Gibbs free
energy? Ans: ΔG'
Which reaction below is a feasible reaction? Ans: ΔG'= -100
kJ/mol
CHEE 477 test 2 Questions and
Answers (100% Correct Answers)
Already Graded A+
change in gibs free energy delta G Ans: change in amount of
energy available for work in a reaction at constant P & T
© 2026 Assignment
-Negative: release of free (exergonic)
Guru01 - Stuvia
Expert
-Postive: Input of free energy (endergonic)
change in enthalpy (delta H) Ans: change in heat content
reacting system, H reflects number and kinds of chemical
bonds
-Negative: release of heat (exothermic)
-Positive: input of heat (endothermic)
change in entropy (delta S) Ans: change in randomness, by
definition an increase in entropy is positive
-Negative: decrease of entropy (increase order)
-Positive: increase of entropy (order decreases)
For the reaction:
aA + bB → cC + dD
, 2
which equation below is the correct expression for the
equilibrium constant?
A)
([A]a × [B]b)/([C]c × [D]d)
B)
(c × [C] × d × [D])/(a × [A] × b × [B])
© 2026 Assignment
C)
Guru01 - Stuvia
Expert
([C]c × [D]d)/([A]a × [B]b) Ans: C)
([C]c × [D]d)/([A]a × [B]b)
Which term below refers to an Endergonic system? Ans:
Positive delta G
Which term below refers to an Exothermic system? Ans:
Negative delta H
The degree symbol used with the Gibbs free energy change,
refers to what? Ans: standard conditions
gases are set at 1 atm
solids assigned 1
The prime symbol used with the Gibbs free energy change,
refers to what? Ans: biological conditions
H2O= 55.5 M
, 3
The standard change in Gibbs free energy can be calculated
from the energy of formations of compounds according to
which expression Ans: ΔG° = Σ Gf°products - Σ Gf°reactants
What is the standard change in Gibbs free energy for the
reaction
H2 + NO3- → NO2- + H2O
where the energy of formation is 0, -111.46, -37.7 and -237.19
© 2026 Assignment
kJ/mol for H2, NO3-, NO2- and H2O, respectively Ans: -
163.43
Guru01 - Stuvia
If the reaction of A +B → C +D, has a standard Gibbs free
Expert
energy change of -10 kJ/mol and C+D → E has a standard
Gibbs free energy change of -20 kJ/mol C, which of the
following is true? Ans: The conversion of A + B to E is -30
kJ/mol A
If the reaction of A +B → C +D, has a standard Gibbs free
energy change of -10 kJ/mol, what is the standard change in
Gibbs free energy of and C+D → A + B? Ans: 10 kJ/mol
when calculating the K°', is it correct to use terms for H2O and
H+concentrations in the expression? Ans: no
Half reactions can be summed as long as? Ans: They each
have been written to the same amount of electron equivalents
(eeq)
Which symbol below refers to an actual change in Gibbs free
energy? Ans: ΔG'
Which reaction below is a feasible reaction? Ans: ΔG'= -100
kJ/mol
