Questions and Answers
What are coupled reactions?
Where a spontaneous exergonic reaction is used to drive a non-spontaneous endergonic reaction by coupling together.
Give an example of a coupled reaction.
The coupling of the exergonic hydrolysis of ATP with the endergonic reaction of glucose to lactic acid.
Change in G is the maximum ______ that can be obtained from a chemical reaction.
work
Change in G is the driving force for ______.
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If Change in G is zero, the system is at equilibrium.
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What are the equations for Change in G?
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Study Notes
Coupled Reactions
- Coupled reactions combine a spontaneous exergonic reaction with a non-spontaneous endergonic reaction, enabling the latter to proceed through energy transfer.
Example of a Coupled Reaction
- The hydrolysis of ATP, an exergonic process, can be coupled with the endergonic reaction of glucose converting into lactic acid, maintaining a negative change in Gibbs free energy (ΔG).
ΔG and Work
- ΔG represents the maximum amount of work obtainable from a chemical reaction, providing insights into the efficiency and spontaneity of the reaction.
ΔG as Driving Force
- Change in Gibbs free energy (ΔG) serves as the driving force behind both physical and chemical transformations, indicating whether a process can occur spontaneously.
Equilibrium Condition
- When ΔG equals zero, the system is in a state of equilibrium, meaning there is no net change occurring in the concentration of reactants and products.
Equations for ΔG
- Two key formulas for calculating ΔG include:
- ΔG = ΔG° + RT ln Q
- ΔG = -RT ln K
- These equations relate standard Gibbs free energy change to reaction quotients (Q) and equilibrium constants (K).
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Description
This quiz covers the concept of coupled reactions in biochemistry, where a spontaneous exergonic reaction drives a non-spontaneous endergonic reaction. Explore examples, like the hydrolysis of ATP coupled with glucose metabolism. Test your understanding of these crucial biochemical processes.
