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A reaction occurs spontaneously when free energy is negative, ie the disorder of the system is increasing

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Q: What is the connection between spontaneous reactions and free energy?
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Are anabolic pathways spontaneous?

You would expect a catabolic reaction to be spontaneous because this type of reaction involves the release of energy. You would expect reactions that require energy (anabolic reactions) not to be spontaneous due to the need for an input of energy.


How can an endothermic reaction be spontaneous at room temperature?

Exothermic, as endothermic reactions require activation energy.


On what conditions does a spontaneous reaction become spontaneous?

For some non-spontaneous reactions, you can change the temperature. For other non-spontaneous reactions, there is nothing you can do to make it spontaneous. Nature favors reactions that increase a system's entropy (disorder) and nature favors reactions that are exothermic (they release enthalpy). Any reaction that does both of these things is spontaneous at all temperatures. Any reaction that does neither of these things is never spontaneous. As far as this question is concerned, the interesting reactions are endothermic reactions that increase entropy and exothermic reactions that decrease entropy. Whether these reactions are spontaneous depends on the temperature. The first variety (endothermic, increase entropy) will be spontaneous at high temperatures; the second (exothermic, decrease entropy) will be spontaneous at low temperatures. To find the temperature at which a reaction becomes spontaneous, one may apply the Gibbs equation: DG = DH - TDS where capital Ds stand for the Greek capital delta.


What does it mean when are reaction is spontaneous?

The reaction happens by itself.


What allows cells to produce energy through aerobic metabolism?

The chemical reactions of metabolism are organized into metabolic pathways, in which one chemical is transformed through a series of steps into another chemical, by a sequence of enzymes. Enzymes are crucial to metabolism because they allow organisms to drive desirable reactions that require energy and will not occur by themselves, by coupling them to spontaneous reactions that release energy.

Related questions

Why do energy absorbing reactions react spontaneous?

it doesn't its energy releasing reaction


Are anabolic pathways spontaneous?

You would expect a catabolic reaction to be spontaneous because this type of reaction involves the release of energy. You would expect reactions that require energy (anabolic reactions) not to be spontaneous due to the need for an input of energy.


Which reaction released energy?

An exothermic reaction (often a spontaneous one)


How can an endothermic reaction be spontaneous at room temperature?

Exothermic, as endothermic reactions require activation energy.


What does the term spontaneous mean in chemical reactions?

This is a very fast reaction.


On what conditions does a spontaneous reaction become spontaneous?

For some non-spontaneous reactions, you can change the temperature. For other non-spontaneous reactions, there is nothing you can do to make it spontaneous. Nature favors reactions that increase a system's entropy (disorder) and nature favors reactions that are exothermic (they release enthalpy). Any reaction that does both of these things is spontaneous at all temperatures. Any reaction that does neither of these things is never spontaneous. As far as this question is concerned, the interesting reactions are endothermic reactions that increase entropy and exothermic reactions that decrease entropy. Whether these reactions are spontaneous depends on the temperature. The first variety (endothermic, increase entropy) will be spontaneous at high temperatures; the second (exothermic, decrease entropy) will be spontaneous at low temperatures. To find the temperature at which a reaction becomes spontaneous, one may apply the Gibbs equation: DG = DH - TDS where capital Ds stand for the Greek capital delta.


Is it true that non spontaneous process never happens in universe?

non spontaneous process happen in the universe but energy has to be provided to them . the free energy change of such processes are positive . the amount of temperature has to be increased to carry out such reactions


What is the difference between spontaneous and stimulated emission of light?

stimulated emission causes due to the energy difference between the higher and lower energy level state, but it doesn't depends in the case of spontaneous emission . spontaneous emission causes without any stimulation .In stimulated emission energy transfer is twice the energy transfer of spontaneous emission.


What is the difference between spontaneous emission and stimulated emission?

stimulated emission causes due to the energy difference between the higher and lower energy level state, but it doesn't depends in the case of spontaneous emission . spontaneous emission causes without any stimulation .In stimulated emission energy transfer is twice the energy transfer of spontaneous emission.


Difference between endothermic and endergonic?

Endergonic means "absorbing energy in the form of work." Endergonic reactions are not spontaneous. An exergonic reaction is a chemical reaction where the change in the free energy is negative, indicating a spontaneous reaction.


What is the connection between the suns energy and the wind?

Describe the connection between the sun's energy and the wind.


What is the difference between a reaction that happens spontaneously and a reaction that doesn't?

The difference can be clarified by entropy (the second rule of thermodynamics).The reaction is more spontaneous with higher entropy, for the reactions that occur spontaneously the entropy is higher than for the ones that do not.