**Does combustion have a negative entropy or positive**

This example problem demonstrates how to calculate the change in entropy of a system's and surroundings following a chemical reaction at constant temperature and pressure. Calculate the entropy of the surroundings for the following reaction. a.) C2H8(g) + 5 O2(g) â†’ 3 CO2(g) + 4H2O(g) Î”H = -2045 kJ, the reaction takes place at 25^oC This reaction is an exothermic reaction. The negative sign... yes, in some local regions of your considered problem, you can find negative values of entropy generation. But when you calculate the overall local entropy generation it should has positive value.

**How to Calculate Entropy Change Sciencing**

The entropy change from a reaction, or S reaction, is a measure of the dispersal of energy and matter that takes place during a reaction. As far as identifying an increase in dispersal of matter, there are two things that indicate an increase in entropy:... In Tutorial 6 we learned that the entropy of a system can be changed by reversible heating or cooling: So for a closed system (control mass): Question: Is the entropy change of a control mass due to reversible heat transfer always positive, always negative, or can it be either positive or negative?

**Can the change of entropy be negative at any conditions**

When enthalpy is negative, the reaction is exothermic, which means it releases energy into the surroundings. If the system is losing energy, shouldnâ€™t the entropy of the system always decrease? I understand mathematically that $\mathrm{d}S = \mathrm{d}Q/T$, and if there is heat exchange, then entropy can be positive. But intuitively, if energy is taken away from the system, shouldnâ€™t the... The entropy term is therefore subtracted from the enthalpy term when calculating G o for a reaction. Because of the way the free energy of the system is defined, G o is negative for any reaction for which H o is negative and S o is positive.

**Entropy and Information Gain UniPD**

Negative delta S ($\Delta S <0$) is a decrease in entropy in regard to the system. For physical processes the entropy of the universe still goes up but within the confines of the system being studied entropy decreases.... If the question involves interest in what does negative entropy mean for Clausiusâ€™ original, real, thermodynamic entropy definition of S=Q/T, then the answer is that reversible Carnot engines all have two calculations of thermodynamic entropy. One is when the heat enters the engine. The other is when the unused heat exist the engine. In the first case the calculation is a positive solution

## How To Find If Entropy Is Positive Or Negative

### Can the change of entropy be negative at any conditions

- Spontaneous Reactions Enthalpy and Entropy Chemistry Tutorial
- AP Chemistry chapter 19 Flashcards Quizlet
- Are there any reactions that have a positive enthalpy
- AP Chemistry chapter 19 Flashcards Quizlet

## How To Find If Entropy Is Positive Or Negative

### We find the S by subtracting the entropy of the reactant from the entropy of the product: The change in entropy for this reaction is negative. The disorder of the system decreases because the number of particles decreases as two moles of gas reactant are converted to one mole of gas product.

- (Original post by matt_copas) I'm confused about exothermic reactions having a positive entropy change of the system If something is exothermic, the system gives out heat, ie cools so the entropy change must be negative right?
- It really depends, but most likely a positive entropy. If the number of gas molecules increases during a process, the change in entropy will be positive.
- As described above, the change in entropy of the protein as it folds is negative, so the "â€“TÎ”S" term is positive. However, in addition to entropic effects there are enthalpic contributions to protein folding. These include hydrogen bonding, ionic salt bridges, and Van der Waals forces. An input of thermal (heat) energy is required to disrupt these forces, and conversely when these
- When Î”H is positive and Î”S is negative, Î”G will not be negative at any temperature. There would be no spontaneous reaction. There would be no spontaneous reaction.

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