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Sagot :
Sure, let's analyze the effect of different conditions on the change in free energy ([tex]\(\Delta G\)[/tex]) for the reaction [tex]\( A + B \rightleftharpoons C + D \)[/tex].
1. Coupling with ATP hydrolysis:
- ATP hydrolysis is a highly exergonic reaction (it releases a large amount of free energy).
- When a reaction is coupled with ATP hydrolysis, the overall free energy change ([tex]\(\Delta G\)[/tex]) becomes more negative (since the free energy change of ATP hydrolysis is very negative).
- Hence, coupling the reaction with ATP hydrolysis will decrease [tex]\(\Delta G\)[/tex].
2. Decreasing [tex]\([C]\)[/tex] and [tex]\([D]\)[/tex]:
- The reaction quotient ([tex]\(Q\)[/tex]) is given by [tex]\( Q = \frac{[C][D]}{[A][B]} \)[/tex].
- Decreasing the concentrations of products [tex]\( [C] \)[/tex] and [tex]\( [D] \)[/tex] will decrease the value of [tex]\( Q \)[/tex].
- According to the equation [tex]\(\Delta G = \Delta G^\circ + RT \ln Q\)[/tex], a decrease in [tex]\( Q \)[/tex] will lead to a decrease in the term [tex]\( RT \ln Q \)[/tex].
- Therefore, decreasing [tex]\([C]\)[/tex] and [tex]\([D]\)[/tex] will decrease [tex]\(\Delta G\)[/tex].
3. Adding a catalyst:
- A catalyst speeds up the reaction by lowering the activation energy, but it does not affect the thermodynamic properties of the reaction.
- The catalyst does not change the standard free energy change ([tex]\(\Delta G^\circ\)[/tex]) or the reaction quotient ([tex]\(Q\)[/tex]).
- Thus, adding a catalyst will have no effect on [tex]\(\Delta G\)[/tex].
4. Decreasing [tex]\([A]\)[/tex] and [tex]\([B]\)[/tex]:
- Decreasing the concentrations of reactants [tex]\( [A] \)[/tex] and [tex]\( [B] \)[/tex] will increase the reaction quotient [tex]\( Q \)[/tex].
- As [tex]\( Q \)[/tex] increases, the term [tex]\( RT \ln Q \)[/tex] becomes more positive.
- According to the equation [tex]\(\Delta G = \Delta G^\circ + RT \ln Q\)[/tex], an increase in [tex]\( Q \)[/tex] will increase [tex]\(\Delta G\)[/tex].
- Therefore, decreasing [tex]\([A]\)[/tex] and [tex]\([B]\)[/tex] will increase [tex]\(\Delta G\)[/tex].
In summary:
- Coupling with ATP hydrolysis: decrease [tex]\(\Delta G\)[/tex]
- Decreasing [tex]\([C]\)[/tex] and [tex]\([D]\)[/tex]: decrease [tex]\(\Delta G\)[/tex]
- Adding a catalyst: no effect on [tex]\(\Delta G\)[/tex]
- Decreasing [tex]\([A]\)[/tex] and [tex]\([B]\)[/tex]: increase [tex]\(\Delta G\)[/tex]
This classification is based on how each condition affects the change in free energy [tex]\((\Delta G)\)[/tex] for the reaction [tex]\( A + B \rightleftharpoons C + D \)[/tex].
1. Coupling with ATP hydrolysis:
- ATP hydrolysis is a highly exergonic reaction (it releases a large amount of free energy).
- When a reaction is coupled with ATP hydrolysis, the overall free energy change ([tex]\(\Delta G\)[/tex]) becomes more negative (since the free energy change of ATP hydrolysis is very negative).
- Hence, coupling the reaction with ATP hydrolysis will decrease [tex]\(\Delta G\)[/tex].
2. Decreasing [tex]\([C]\)[/tex] and [tex]\([D]\)[/tex]:
- The reaction quotient ([tex]\(Q\)[/tex]) is given by [tex]\( Q = \frac{[C][D]}{[A][B]} \)[/tex].
- Decreasing the concentrations of products [tex]\( [C] \)[/tex] and [tex]\( [D] \)[/tex] will decrease the value of [tex]\( Q \)[/tex].
- According to the equation [tex]\(\Delta G = \Delta G^\circ + RT \ln Q\)[/tex], a decrease in [tex]\( Q \)[/tex] will lead to a decrease in the term [tex]\( RT \ln Q \)[/tex].
- Therefore, decreasing [tex]\([C]\)[/tex] and [tex]\([D]\)[/tex] will decrease [tex]\(\Delta G\)[/tex].
3. Adding a catalyst:
- A catalyst speeds up the reaction by lowering the activation energy, but it does not affect the thermodynamic properties of the reaction.
- The catalyst does not change the standard free energy change ([tex]\(\Delta G^\circ\)[/tex]) or the reaction quotient ([tex]\(Q\)[/tex]).
- Thus, adding a catalyst will have no effect on [tex]\(\Delta G\)[/tex].
4. Decreasing [tex]\([A]\)[/tex] and [tex]\([B]\)[/tex]:
- Decreasing the concentrations of reactants [tex]\( [A] \)[/tex] and [tex]\( [B] \)[/tex] will increase the reaction quotient [tex]\( Q \)[/tex].
- As [tex]\( Q \)[/tex] increases, the term [tex]\( RT \ln Q \)[/tex] becomes more positive.
- According to the equation [tex]\(\Delta G = \Delta G^\circ + RT \ln Q\)[/tex], an increase in [tex]\( Q \)[/tex] will increase [tex]\(\Delta G\)[/tex].
- Therefore, decreasing [tex]\([A]\)[/tex] and [tex]\([B]\)[/tex] will increase [tex]\(\Delta G\)[/tex].
In summary:
- Coupling with ATP hydrolysis: decrease [tex]\(\Delta G\)[/tex]
- Decreasing [tex]\([C]\)[/tex] and [tex]\([D]\)[/tex]: decrease [tex]\(\Delta G\)[/tex]
- Adding a catalyst: no effect on [tex]\(\Delta G\)[/tex]
- Decreasing [tex]\([A]\)[/tex] and [tex]\([B]\)[/tex]: increase [tex]\(\Delta G\)[/tex]
This classification is based on how each condition affects the change in free energy [tex]\((\Delta G)\)[/tex] for the reaction [tex]\( A + B \rightleftharpoons C + D \)[/tex].
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