What is the difference between endothermic and endergonic

Science Biology library Energy and enzymes Free energy. Gibbs free energy and spontaneous reactions. Endergonic, exergonic, exothermic, and endothermic.

Next lesson. Current timeTotal duration Google Classroom Facebook Twitter. Video transcript - [Voiceover] So we have some words here that relate the different reactions and whether they absorb or release different types of energy.

So the first word here, exothermic. Exothermic the root of the word is therm which relates to heat and these word indeed means a reaction that releases heat. Releases, it releases heat. And one way to think about it if you're thinking about constant pressures or change in enthalpy it can be viewed as your, how much heat you absorb or release.

So a negative change in enthalpy means that you're releasing heat. One way to think of, if you view enthalpy as heat content you have less heat content after the reaction than before it was meant you release heat.

Which means you're change in enthalpy is going to be less than zero so these all mean the same thing. Well, this is true. You're releasing heat. This is a same thing as releasing heat if you talk about constant pressure. Constant pressure which is a reasonable assumption if you're doing something in a beaker that's open to the air or if you're thinking about a lot of different biological systems.

Now based on that logic what do you think this word means, endothermic. Well endothermic, therm same root and now your prefix is endo so this is a process that absorbs heat. Absorbs heat. Or if you're thinking of a constant pressure, you can say your enthalpy after the reaction is gonna be higher than the enthalpy before the reaction. So your delta H is going to be greater than zero. All right, fair enough.

Now let's look at these two characters over here. Exergonic and endergonic so exergonic the root here is ergon and you might not be as familiar with that as you are with therm but you might have heard the word ergonomic.

Say, hey that's a nice ergonomic desk. That means it's a desk that's good to do work at or it's a nice ergonomic chair. An ergon does indeed come from the Greek for work. And so exergonic is a reaction that releases work energy or at least that's what the word implies. It is always spontaneous. It is never spontaneous. An example is the endothermic decomposition of calcium carbonate.

An example is the exothermic synthesis of ammonia. Related questions Why is burning wood exothermic? I thought the wood is taking in heat to burn, therefore How can an exothermic reaction be identified? Why is freezing an exothermic process? Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance.

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Thanks to works by von Helmholtz , van't Hoff , Boltzmann and others we may do. Reactions may be classified according to reaction enthalpy, reaction entropy, free reaction enthalpy -- even simultaneously -- always favouring an exergonic reaction:.

After all, please keep in mind this is about thermodynamics, and not kinetics. There are also indications of spontaneity of a reaction. Both exergonic and exothermic reactions release energy, however, the energies released have different meanings as follows:.

In summary, whereas, an exergonic reaction means that a reaction is spontaneous, an exothermic reaction has nothing to do with spontaneity, but that an energy is released to the surrounding. In Exothermic and Endothermic reactions we are mostly talking about the changes in potential energy, these changes tend to manifest themselves as the flow of heat under constant pressure conditions circa the first law of thermodynamics.

This is a very useful metric for predicting what compounds will form under certain conditions and the TOTAL potential energy changes however.. So there is no such imposition that a reaction has to be exothermic if it is exergonic or vice versa.

Yes, all exergonic reactions are exothermic. Consider a reaction occurring spontaneously we know that energy would be released i. Therefore, if enthalpy change is negative and change in free energy is negative, they are both respectively exothermic and exergonic. The same applies for endothermic and endergonic. Sign up to join this community. The best answers are voted up and rise to the top.