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What could make G become negative at a given enthalpy and entropy?
Changing the temperature
Is an exothermic reaction always spontaneous?
No, an exothermic reaction is not always spontaneous. The spontaneity of a reaction depends on factors such as temperature, pressure, and the entropy change of the system.
Is the change in entropy, delta S, positive or negative for a spontaneous reaction?
For a spontaneous reaction, the change in entropy (delta S) is typically positive.
What does a negative deltaH tell about a reaction?
the reaction is exothermic
What can be said about a reaction with H -890 kJmol and S -0.24 kJ(mol K)?
The reaction is exothermic because the enthalpy change is negative (-890 kJ/mol). The reaction may be spontaneous at low temperatures due to the negative entropy change (-0.24 kJ/(mol K)), which decreases the overall spontaneity of the reaction.
When a chemical reaction has a negative delta G is the reaction exothermic or endothermic?
When a chemical reaction has a negative delta G, the reaction is exothermic because delta G is the change in energy of a system and the change in its entropy. If the effect of a reaction is to reduce G, the process will be spontaneous so delta G is negative. Hope this helps :)
What could make G become negative at a given enthalpy and entropy?
Changing the temperature
Is an exothermic reaction always spontaneous?
No, an exothermic reaction is not always spontaneous. The spontaneity of a reaction depends on factors such as temperature, pressure, and the entropy change of the system.
Is the change in entropy, delta S, positive or negative for a spontaneous reaction?
For a spontaneous reaction, the change in entropy (delta S) is typically positive.
Select all the conditions below that are most likely to result in a spontaneous chemical reaction or process?
Exothermic reaction Decrease in entropy Increase in entropy Positive change in free energy Negative change in free energy
How do enthalpy and entropy affect the spontaneity of a reaction?
Enthalpy and entropy are key factors in determining the spontaneity of a reaction, as described by Gibbs free energy (ΔG = ΔH - TΔS). A reaction is spontaneous when ΔG is negative, which can occur if the enthalpy change (ΔH) is negative (exothermic) or if the entropy change (ΔS) is positive (increased disorder). High temperatures can also enhance the effect of entropy, making reactions with positive ΔS more likely to be spontaneous. Thus, both ΔH and ΔS contribute to the overall favorability of a reaction.
Under what conditions will a low temperature make a reaction spontaneous apex?
A low temperature can make a reaction spontaneous when it is exothermic, meaning it releases heat, and has a negative change in enthalpy (ΔH < 0). Additionally, if the reaction has a positive change in entropy (ΔS > 0), the Gibbs free energy change (ΔG = ΔH - TΔS) will be negative at low temperatures, favoring spontaneity. Conversely, if the reaction is endothermic (ΔH > 0) and has a negative entropy change (ΔS < 0), it will not be spontaneous at low temperatures.
What kind of reaction occurs when the entropy change of an endothermic reaction is negative?
The reaction is exothermic
What does a negative deltaH tell about a reaction?
the reaction is exothermic
What is always true if a reaction has a negative enthalpy?
If a reaction has a negative enthalpy change (ΔH < 0), it indicates that the reaction releases heat to the surroundings, making it exothermic. This typically means that the products of the reaction have lower energy than the reactants. Additionally, a negative enthalpy change often suggests that the reaction is more favorable and can occur spontaneously under certain conditions, although spontaneity also depends on entropy changes and temperature.
What can be said about a reaction with H -890 kJmol and S -0.24 kJ(mol K)?
The reaction is exothermic because the enthalpy change is negative (-890 kJ/mol). The reaction may be spontaneous at low temperatures due to the negative entropy change (-0.24 kJ/(mol K)), which decreases the overall spontaneity of the reaction.
How can an endothermic reaction be spontaneous at room temperature?
An endothermic reaction can be spontaneous at room temperature if the increase in entropy of the system is large enough to overcome the energy input required for the reaction. This can happen if the products of the reaction have higher entropy than the reactants. As a result, the overall change in free energy can be negative even though the reaction is endothermic.
