When is something thermodynamically favored?

Last Update: April 20, 2022

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Asked by: Jorge Schulist
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If a reaction's ΔH is negative, and ΔS is positive, the reaction is always thermodynamically favored. If a reaction's ΔH is positive, and ΔS is negative, the reaction is always thermodynamically disfavored.

What is more thermodynamically favored?

Re: What does it mean for a reaction to be "thermodynamically favored?" Reactions that do not require energy are seen as more favorable. Since exothermic reactions release energy and endothermic reactions require energy, exothermic reactions are more favorable.

What temperature is thermodynamically favored?

Mathematically, ΔG will become positive only when T is greater than 313K. Because of this, the reaction is thermodynamically favorable at any temperature less than 313K (since ΔG will be negative), but is not thermodynamically favorable at any temperature greater than 313K (since ΔG will be positive).

What determines thermodynamic stability?

Thermodynamic stability depends on whether or not the reaction is spontaneous. This depends on the change in free energy (ΔG). A thermodynamically stable reaction is one that basically does not react. As a result, it is independent of the pathway between reactants and products.

Under which of the following conditions is the reaction thermodynamically favored?

The reaction is thermodynamically favorable only at temperatures above 25°C. At 25°C, ∆G° for the reaction is positive.

Spontaneous (Thermodynamically Favorable) Signs

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How do you tell if an equation is thermodynamically favored?

If a reaction's ΔH is negative, and ΔS is positive, the reaction is always thermodynamically favored. If a reaction's ΔH is positive, and ΔS is negative, the reaction is always thermodynamically disfavored.

How do you know if a reaction is spontaneous?

If ΔH is negative, and –TΔS positive, the reaction will be spontaneous at low temperatures (decreasing the magnitude of the entropy term). If ΔH is positive, and –TΔS negative, the reaction will be spontaneous at high temperatures (increasing the magnitude of the entropy term).

Which product is thermodynamically more stable?

Thermodynamic products contain an internal double bond and the reaction is reversible. Also, when reactions are carried out, thermodynamic products are more stable than kinetic products because they are more substituted.

What is thermodynamically unstable?

A system is called thermodynamically unstable when there exists a state where the system will have lower energy than it currently has. A dispersion can be thermodynamically unstable, but can still be kinetically stable.

Why emulsion is thermodynamically unstable?

Emulsion, from a thermodynamics point of view, is considered unstable because there is a natural tendency for a liquid or a liquid system to separate and reduce its interfacial area and, hence, its interfacial energy.

What does Entropically favored mean?

(S) (en'trŏ-pē) That fraction of heat (energy) content not available for the performance of work, usually because (in a chemical reaction) it has been used to increase the random motion of the atoms or molecules in the system; thus, a measure of randomness or disorder.

Can a reactant favored reaction be forced to occur?

Reactant favored processes (∆G + or E -) can be forced to occur with an external source of energy like a wall outlet or a battery.

Is higher or lower entropy favored?

Reactions can happen when enthalpy is transferred to the surroundings. A reaction is favored if entropy increases: There is also a bias in nature toward increasing entropy in a system. Reactions can happen when entropy increases.

What is thermodynamically favored reaction?

Thermodynamically favored processes or reactions are those that involve both a decrease in the internal energy of the components (ΔH° < 0) and an increase in entropy of the components (ΔS° > 0). These processes are necessarily “thermodynamically favored” (ΔG° < 0) or negative.

Why is thermodynamically favorable?

"Thermodynamically favourable" means from high energy to low energy, or, put another way, from less stable to more stable. Understanding the relative stability of molecules can be important for predicting relative reactivity of starting materials and the relative yields of potential products.

What is a thermodynamically stable reaction?

Thermodynamic stability occurs when a system is in its lowest energy state, or in chemical equilibrium with its environment. This may be a dynamic equilibrium in which individual atoms or molecules change form, but their overall number in a particular form is conserved.

What does thermodynamically possible mean?

Thermodynamically feasible = according to all that we know about energy and entropy changes in reactions it is reasonable to suppose that it can happen. TLDR. possible. Also does electron releasing mean it's a reducing agent - yes. 0.

What is a stable product?

An example of stable is a product that has a steady and unchanging price.

Why colloids are thermodynamically unstable?

Colloidal dispersions are thermodynamically unstable owing to their high surface free energy and are irreversible systems in the sense that they are not easily reconstituted after phase separation.

How do you tell if a product is kinetic or thermodynamic?

A simple definition is that the kinetic product is the product that is formed faster, and the thermodynamic product is the product that is more stable.

Which of the following is the most stable carbocation?

Therefore $C{H_3}\mathop C\limits^ \oplus {H_2}$ is the most stable carbocation from among the given carbocations.

Is kinetic control reversible?

Kinetic control: A reaction in which the product ratio is determined by the rate at which the products are formed. This E2 reaction is irreversible.

Which reaction is most spontaneous?

Most spontaneous chemical reactions are exothermic - they release heat and warm up their surroundings: for example: burning wood, fireworks, and alkali metals added to water. When a radioactive atom splits up, it releases energy: this is a spontaneous, exothermic nuclear reaction.

Why Gibbs free energy is negative?

Gibbs free energy is a derived quantity that blends together the two great driving forces in chemical and physical processes, namely enthalpy change and entropy change. ... If the free energy is negative, we are looking at changes in enthalpy and entropy that favour the process and it occurs spontaneously.

Why is negative Gibbs free energy spontaneous?

A mathematical combination of enthalpy change and entropy change allows the change in free energy to be calculated. A reaction with a negative value for ΔG releases free energy and is thus spontaneous.