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When H and S are both positive
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Under what condition is delta G for a reaction always positive?
Delta G (Gibbs free energy change) for a reaction is always positive when the reaction is non-spontaneous under the given conditions. This typically occurs when the system is at equilibrium or when the enthalpy change (ΔH) is positive and the entropy change (ΔS) is negative, leading to a situation where the temperature multiplied by ΔS (TΔS) is not sufficient to drive the reaction forward. Additionally, when the reactants are more stable than the products, or when the reaction requires external energy input to proceed, delta G will also be positive.
When Under what conditions is G for a reaction always positive apex?
The Gibbs free energy change (ΔG) for a reaction is always positive when the reaction is non-spontaneous under the given conditions. This typically occurs at high temperatures for exothermic reactions (where ΔH is negative and ΔS is positive) or when the entropy change (ΔS) is negative while ΔH is positive. In such cases, the term TΔS is not large enough to overcome the positive ΔH, resulting in a positive ΔG.
What determine whether a reaction took place?
Use the following equation: delta G = delta H - T*deltaS. A reaction is spontaneous if delta G is negative. A reaction will always be spontaneous (under any temperature) only if the change in enthalpy (delta H) is negative and the change in entropy (delta S) is positive. If this is not the case, the reaction will only be spontaneous (negative delta G) for a range of temperatures (or could be always non-spontaneous)
What does a positive value of delta G mean for a reaction?
A positive value of delta G (ΔG) indicates that a reaction is non-spontaneous under standard conditions, meaning it requires an input of energy to proceed. In this case, the products have higher free energy than the reactants, suggesting that the reaction is unfavorable in its current direction. Therefore, the reaction is more likely to occur when coupled with a spontaneous process or under different conditions that favor the formation of products.
How does the entropy change in the reaction 2C3H6 (g) plus 9O (g) 6CO2(g)?
The entropy increase in this reaction.
Under what condition is delta G for a reaction always positive?
Delta G (Gibbs free energy change) for a reaction is always positive when the reaction is non-spontaneous under the given conditions. This typically occurs when the system is at equilibrium or when the enthalpy change (ΔH) is positive and the entropy change (ΔS) is negative, leading to a situation where the temperature multiplied by ΔS (TΔS) is not sufficient to drive the reaction forward. Additionally, when the reactants are more stable than the products, or when the reaction requires external energy input to proceed, delta G will also be positive.
According to the Gibbs free energy equation G H - TS when is a reaction always spontaneous?
when H is negative and S is positive
When Under what conditions is G for a reaction always positive apex?
The Gibbs free energy change (ΔG) for a reaction is always positive when the reaction is non-spontaneous under the given conditions. This typically occurs at high temperatures for exothermic reactions (where ΔH is negative and ΔS is positive) or when the entropy change (ΔS) is negative while ΔH is positive. In such cases, the term TΔS is not large enough to overcome the positive ΔH, resulting in a positive ΔG.
Is free energy of cell reaction positive when emf of cell reaction is positive?
No, the free energy of a cell reaction is negative when the emf of the cell reaction is positive. This is because a positive emf indicates that the reaction is spontaneous and capable of performing work, resulting in a negative change in free energy.
What conditions make G always negative?
G is always negative when H is negative and S is positive.
Will this entropy change by positive or negative N2 (g) 3h2 (g) 2nh3 (g)?
The reaction N2 (g) + 3H2 (g) → 2NH3 (g) shows an increase in entropy because it involves an increase in the number of gaseous molecules from 2 to 4. Therefore, the entropy change for this reaction is positive.
Under what conditions is G for a reaction always positive?
When H is positive and S is negative
What conditions make delta G always positive?
G is always positive when enthalpy increases and entropy decreases.
What conditions make G positive?
G is always positive when enthalpy increases and entropy decreases.
A chemical reaction has a positive H value and a positive S value Under what conditions is the reaction spontaneous?
The spontaneity of a reaction is determined by the sign of the Gibbs free energy (ΔG). If both enthalpy (H) and entropy (S) are positive, the reaction can be spontaneous at high temperatures where the TΔS term outweighs the positive ΔH term, resulting in a negative ΔG. This means the reaction will be spontaneous at elevated temperatures.
When will Gibbs free energy always be positive or negative?
Gibbs free energy (G) will always be negative for spontaneous processes at constant temperature and pressure, indicating that the reaction can occur without external input. Conversely, Gibbs free energy will be positive for non-spontaneous processes, suggesting that the reaction requires energy input to proceed. When G is zero, the system is at equilibrium, meaning there is no net change in the concentrations of reactants and products.
What determine whether a reaction took place?
Use the following equation: delta G = delta H - T*deltaS. A reaction is spontaneous if delta G is negative. A reaction will always be spontaneous (under any temperature) only if the change in enthalpy (delta H) is negative and the change in entropy (delta S) is positive. If this is not the case, the reaction will only be spontaneous (negative delta G) for a range of temperatures (or could be always non-spontaneous)
