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According to the Gibbs free energy equation G H - T S when could a high temperature make a reaction that was nonspontaneous at low temperature spontaneous?
A high temperature could make a reaction spontaneous that was nonspontaneous at low temperature when the increase in entropy due to the reaction outweighs the increase in enthalpy. At higher temperatures, the TΔS term in the Gibbs free energy equation becomes more dominant, leading to a positive ΔG becoming negative, thus making the reaction spontaneous.
Is spontaneous reaction exo or endo?
Reactions are described by this equation: GD = HD - TDS where D = delta for change in values. GD < 0 spontaneous HD < 0 exothermic ; HD > 0 endothermic The first equation is Gibbs free energy. When G is negative, the reaction is spontaneous. In contrast, a positive number G is non spontaneous. The interesting thing is that spontaneous reactions can be EITHER exothermic and endothermic. Lets look at this: lets assume HD has a value of 100. This means TDS would have to be bigger than 100 in order to make GD a negative number. An endothermic reaction which has a positive H can still be exothermic. Here's another way to pose your question: Is an exothermic reaction spontaneous? Always. Is an endothermic reaction spontaneous? This can be either.
What could make G become negative at a given enthalpy and entropy?
Changing the temperature
What would form a spontaneous reaction at 298 K?
deltaH=28 kJ/mol, deltaS=0.109 kJ(molK)
What is a method that could be used to test the effect of temperature on the rate of reaction of a cellulase?
One method could be to set up multiple reaction vessels with the same concentration of cellulase and substrate, but at different temperatures. Measure the rate of reaction by monitoring a specific parameter (e.g., substrate concentration over time) for each reaction vessel. Plotting the data will allow you to observe how temperature affects the rate of reaction of the cellulase.
According to the Gibbs free energy equation G H - T S when could a high temperature make a reaction that was nonspontaneous at low temperature spontaneous?
A high temperature could make a reaction spontaneous that was nonspontaneous at low temperature when the increase in entropy due to the reaction outweighs the increase in enthalpy. At higher temperatures, the TΔS term in the Gibbs free energy equation becomes more dominant, leading to a positive ΔG becoming negative, thus making the reaction spontaneous.
Ask us anythingAccording to the Gibbs free energy equation G H - TS when could a high temperature make a reaction that was nonspontaneous at low temperature spontaneous?
A reaction that is nonspontaneous at low temperatures can become spontaneous at high temperatures if the entropy change (ΔS) is positive and the enthalpy change (ΔH) is either positive or less negative. In the Gibbs free energy equation (G = H - TS), as temperature (T) increases, the term -TS becomes more negative, which can lower the Gibbs free energy (G). If the increase in entropy at high temperatures outweighs the enthalpic costs, G can turn negative, indicating spontaneity.
What is a synonym for spontaneous?
For a reaction, synonyms could include automatic, reflexive, or instinctive. For a spontaneous person : impulsive, impetuous, or extemporaneous.
What is the French Revoultion?
A spontaneous reaction to a bankrupt, inept and unresponsive government that could not provide bread or hope.
When is rxn non spontaneous?
A reaction is considered non-spontaneous when the Gibbs free energy change (ΔG) is positive, indicating that the reaction requires an input of energy to occur. This could happen when the reactants have high energy relative to the products or when the reaction conditions do not favor the formation of 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)
Is spontaneous reaction exo or endo?
Reactions are described by this equation: GD = HD - TDS where D = delta for change in values. GD < 0 spontaneous HD < 0 exothermic ; HD > 0 endothermic The first equation is Gibbs free energy. When G is negative, the reaction is spontaneous. In contrast, a positive number G is non spontaneous. The interesting thing is that spontaneous reactions can be EITHER exothermic and endothermic. Lets look at this: lets assume HD has a value of 100. This means TDS would have to be bigger than 100 in order to make GD a negative number. An endothermic reaction which has a positive H can still be exothermic. Here's another way to pose your question: Is an exothermic reaction spontaneous? Always. Is an endothermic reaction spontaneous? This can be either.
What could make G become negative at a given enthalpy and entropy?
Changing the temperature
Is water temperature could affect the reaction of table salt?
Yes.
The half-reaction at the cathode in an electrochemical cell is given below. What other half-reaction would most likely occur at the anode to produce a spontaneous reaction?
To produce a spontaneous reaction in an electrochemical cell, the half-reaction at the anode must involve the oxidation of a species. If the cathode half-reaction is a reduction, such as the reduction of a metal ion to its elemental form, the corresponding anode half-reaction could be the oxidation of that metal to its ion. For example, if the cathode reaction is ( \text{Cu}^{2+} + 2e^- \rightarrow \text{Cu} ), the anode reaction could be ( \text{Zn} \rightarrow \text{Zn}^{2+} + 2e^- ), where zinc is oxidized to provide electrons for the reduction at the cathode.
Blobs in the bottle affect the water temperature the reaction?
Blobs in the bottle could potentially hinder the transfer of heat in the reaction, affecting the water temperature by either trapping or releasing heat. This could lead to an inaccurate measurement of the reaction's temperature or alter the rate of the reaction. It's important to ensure the bottle is free of any obstructions to obtain reliable results.
What does it mean when are reaction is spontaneous?
The reaction happens by itself.
