Table of Contents
- 1 Does entropy always increase in a spontaneous process?
- 2 Do all reactions increase entropy?
- 3 Is a decrease in entropy spontaneous?
- 4 Can endothermic reactions be spontaneous?
- 5 What does it say about the entropy of spontaneous processes and processes at equilibrium?
- 6 What is the connection between entropy and a spontaneous reaction?
Does entropy always increase in a spontaneous process?
The second law of thermodynamics states that the total entropy of the universe always increases for a spontaneous process. The second law of thermodynamics states that the total entropy of the universe always increases for a spontaneous process.
Do all reactions increase entropy?
Entropy generally increases in reactions in which the total number of product molecules is greater than the total number of reactant molecules. An exception to this rule is when a gas is being produced from nongaseous reactants.
Do all spontaneous reactions lead to increase in entropyof the system justify your answer?
These results lead to a profound statement regarding the relation between entropy and spontaneity known as the second law of thermodynamics: all spontaneous changes cause an increase in the entropy of the universe. All spontaneous changes cause an increase in the entropy of the universe.
Do non spontaneous reactions increase entropy?
If you were to cause a non-spontaneous reaction to occur in this way, in that single reaction, entropy would decrease. However, in doing so, the entropy of the universe will still increase or stay the same BECAUSE, in the process of creating such an artificial interference, entropy is created.
Is a decrease in entropy spontaneous?
If a reaction is exothermic ( H is negative) and the entropy S is positive (more disorder), the free energy change is always negative and the reaction is always spontaneous….
| Enthalpy | Entropy | Free energy |
|---|---|---|
| endothermic, H > 0 | decreased disorder, S < 0 | reaction is never spontaneous, G > 0 |
Can endothermic reactions be spontaneous?
However, endothermic reactions do occur spontaneously, or naturally. There must be another driving force besides enthalpy change which helps promote spontaneous chemical reaction.
Does entropy increase in endothermic reactions?
Thus, an enthalpy change can also have an effect on entropy. In an exothermic reaction, the external entropy (entropy of the surroundings) increases. In an endothermic reaction, the external entropy (entropy of the surroundings) decreases.
How can a reaction be endothermic and spontaneous?
For endothermic reactions, enthalpy usually goes up. However, a spontaneous endothermic reaction can occur when the changes in enthalpy and entropy yield a negative Gibbs free energy. An endothermic reaction can be spontaneous if entropy increases by more than the change in enthalpy.
What does it say about the entropy of spontaneous processes and processes at equilibrium?
According to the Boltzmann equation, the entropy of this system is zero.
What is the connection between entropy and a spontaneous reaction?
The best indicator of spontaneity in a reaction is the change in Entropy (S or DS). The Second Law of Thermodynamics states that for a reaction to be spontaneous, there must be an increase in entropy. Entropy is often defined as a measure of the disorder of a system, this is not a very accurate definition.
Which of the following always increases for spontaneous process?
Reason (R ) : The change in free energy is related to the change in a process must always be positive if its is spontaneous.
Can a spontaneous reaction be endothermic?