Are exothermic reactions always spontaneous?

Are all exothermic reactions spontaneous? No, but all reactions that are spontaneous at standard state (interpreted to mean that at standard state, equilibrium lies in the forward direction, i.e. K > 1 and ΔrG∘<0) are either exothermic (ΔrH∘<0) or show a positive standard entropy of reaction (ΔrS∘>0), or both.

Are exothermic reactions always thermodynamically favored?

If a reaction’s ΔH is negative, and ΔS is positive, the reaction is always thermodynamically favored. It is an exothermic reaction, releasing heat, therefore ΔH must also be negative.

What type of reaction is always spontaneous?

A reaction which is exothermic (ΔH negative) and results in an increase in the entropy of the system (ΔS positive) will always be spontaneous.

Why are exothermic reactions 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 does thermodynamically spontaneous mean?

In thermodynamics, a spontaneous process is a process which occurs without any external input to the system. Because spontaneous processes are characterized by a decrease in the system’s free energy, they do not need to be driven by an outside source of energy.

Is combustion spontaneous at all temperatures?

Reactions are favorable when they result in a decrease in the enthalpy and an increase in the entropy of the system. When both of these conditions are met, the reaction is said to be spontaneous at all temperatures. Combustion reactions, such as this fire, are spontaneous reactions.

What does it mean for a reaction to be thermodynamically favored?

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.

Can exothermic reactions be spontaneous?

An exothermic reaction is a chemical reaction that releases energy. If the exothermic reaction increases in entropy, then it is always spontaneous. If the exothermic reaction has a decrease in entropy, then it is possible for to be not spontaneous, depending on the system temperature.

Which type of reaction is always thermodynamically spontaneous?

An exothermic reaction is always thermodynamically spontaneous. Justify. Login Remember Register Test JEE NEET Home Q&A Unanswered Categories Ask a Question Learn Ask a Question An exothermic reaction is always thermodynamically spontaneous. Justify. ← Prev QuestionNext Question → +1vote 741views

Are exothermic reactions thermodynamically favored to proceed rapidly?

An exothermic reaction is thermodynamically favored to proceed, but that doesn’t mean it WILL proceed rapidly. There may be a high energy transition state that blocks it from proceeding.

What is the use of free energy in thermodynamics?

Gibbs free energy calculates whether a certain reaction is thermodynamically spontaneous or not as it takes account of temperature and entropy in addition to enthalpy. However, most exothermic reactions can be spontaneous as exothermic reaction releases energy to the surroundings.