Podcast
Questions and Answers
Which of the following statements correctly describes the relationship between Gibbs free energy and spontaneity?
Which of the following statements correctly describes the relationship between Gibbs free energy and spontaneity?
- A Gibbs free energy change of zero indicates a process that is at equilibrium. (correct)
- A positive Gibbs free energy change (ΔG) indicates a process that is at equilibrium.
- A positive Gibbs free energy change (ΔG) indicates a spontaneous process.
- A negative Gibbs free energy change (ΔG) indicates a non-spontaneous process.
What is the Gibbs free energy change (ΔG) at equilibrium?
What is the Gibbs free energy change (ΔG) at equilibrium?
- Always negative
- Always positive
- Zero (correct)
- Can be either positive or negative
In the Gibbs free energy formula, ΔG = ΔH - TΔS, what does the symbol 'T' represent?
In the Gibbs free energy formula, ΔG = ΔH - TΔS, what does the symbol 'T' represent?
- Change in enthalpy
- Change in entropy
- Temperature in Kelvin (correct)
- Equilibrium constant
How does Gibbs free energy play a role in biological systems?
How does Gibbs free energy play a role in biological systems?
A reaction with a negative Gibbs free energy change (ΔG) will proceed in which direction?
A reaction with a negative Gibbs free energy change (ΔG) will proceed in which direction?
Which of the following is NOT a characteristic of Gibbs free energy?
Which of the following is NOT a characteristic of Gibbs free energy?
What is the relationship between Gibbs free energy (ΔG) and enthalpy (ΔH) in a reaction that is spontaneous at all temperatures?
What is the relationship between Gibbs free energy (ΔG) and enthalpy (ΔH) in a reaction that is spontaneous at all temperatures?
In a biochemical reaction, what does a negative Gibbs free energy change (ΔG) indicate?
In a biochemical reaction, what does a negative Gibbs free energy change (ΔG) indicate?
Flashcards
Gibbs Free Energy (G)
Gibbs Free Energy (G)
A thermodynamic property measuring energy available for work at constant temperature and pressure.
ΔG
ΔG
Change in Gibbs free energy, important for determining spontaneity of a process.
Gibbs Free Energy Formula
Gibbs Free Energy Formula
ΔG = ΔH - TΔS, where ΔH is enthalpy change, T is temperature, and ΔS is entropy change.
Equilibrium and ΔG
Equilibrium and ΔG
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Spontaneous Reaction
Spontaneous Reaction
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Non-spontaneous Reaction
Non-spontaneous Reaction
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ΔG and Reaction Direction
ΔG and Reaction Direction
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Gibbs Free Energy in Biology
Gibbs Free Energy in Biology
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Study Notes
Gibbs Free Energy Definition
- Gibbs free energy (G) is a thermodynamic property that measures the energy available to do work at constant temperature and pressure.
- It is a state function, meaning that only the change in Gibbs free energy (ΔG) is important, not the absolute value.
Gibbs Free Energy Formula
- The Gibbs free energy change (ΔG) is calculated using the following formula: ΔG = ΔH - TΔS
- Where:
- ΔH is the change in enthalpy (heat content)
- T is the temperature in Kelvin
- ΔS is the change in entropy (a measure of disorder or randomness)
Gibbs Free Energy and Equilibrium
- At equilibrium, the Gibbs free energy change (ΔG) is zero.
- A negative ΔG indicates a spontaneous process, meaning it will proceed on its own.
- A positive ΔG indicates a non-spontaneous process, meaning it will not proceed on its own.
- A ΔG of zero indicates equilibrium, where the forward and reverse reactions are occurring at the same rate.
Gibbs Free Energy and Reactions
- ΔG can be used to predict the spontaneity of a reaction.
- A negative ΔG indicates that the reaction will proceed from left to right (forward direction).
- A positive ΔG indicates that the reaction will proceed from right to left (reverse direction).
- ΔG can also be used to calculate the equilibrium constant (K) of a reaction.
Gibbs Free Energy and Biological Systems
- Gibbs free energy plays a crucial role in biological systems, where it is used to drive chemical reactions and maintain cellular processes.
- In biochemistry, ΔG is often used to study the energetics of enzyme-catalyzed reactions and metabolic pathways.
Gibbs Free Energy Definition
- Gibbs free energy (G) measures the energy available to do work at constant temperature and pressure.
- It's a state function, meaning only the change in Gibbs free energy (ΔG) is important.
Gibbs Free Energy Formula
- ΔG = ΔH - TΔS is the formula to calculate the Gibbs free energy change.
- ΔH is the change in enthalpy (heat content).
- T is the temperature in Kelvin.
- ΔS is the change in entropy (a measure of disorder or randomness).
Gibbs Free Energy and Equilibrium
- At equilibrium, ΔG is zero.
- A negative ΔG indicates a spontaneous process.
- A positive ΔG indicates a non-spontaneous process.
- A ΔG of zero indicates equilibrium, where forward and reverse reactions occur at the same rate.
Gibbs Free Energy and Reactions
- ΔG predicts the spontaneity of a reaction.
- A negative ΔG indicates the reaction will proceed from left to right (forward direction).
- A positive ΔG indicates the reaction will proceed from right to left (reverse direction).
- ΔG can calculate the equilibrium constant (K) of a reaction.
Gibbs Free Energy and Biological Systems
- Gibbs free energy drives chemical reactions and maintains cellular processes in biological systems.
- In biochemistry, ΔG studies the energetics of enzyme-catalyzed reactions and metabolic pathways.
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Description
Learn about Gibbs free energy, a thermodynamic property that measures energy available to do work at constant temperature and pressure, and how to calculate it using the formula ΔG = ΔH - TΔS
