Question

Which is an example of a spontaneous exergonic reaction?
A. protein synthesis occurring in cells
B. marshmallows catching fire
C Photosynthesis

Answer 1

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Answer 2

An exergonic reaction is a chemical reaction where the variation of Gibbs free energy is negative [1]. This tells us the direction that the reaction will follow. At constant temperature, constant pressure an exergonic reaction is signified by condition:


which describes a chemical reaction that releases energy in the form of heat, light, etc. Exergonic reactions are a form of exergonic processes in general or spontaneous processes and the opposite is called an endergonic reaction. Exergonic reactions are said to occur spontaneously but this does not imply that the reaction will take place unconstrained. For instance the reaction between hydrogen and oxygen is very slow and not observed in absence of a suitable catalyst. It has been suggested to replace the term spontaneous with eager [2].


[edit] Key points
The concepts exothermic and its opposite number endothermic relate to the enthalpy change in a any process not just a chemical reaction
the conceptually related endotherm and exotherm are concepts in Animal physiology.
Exergonic reactions are chemical reactions where the chemical products of the reaction have less energy than the starting materrials. For example when wood or a match burns in a fire, the wood which is mainly cellulaose has a lot of chemical energy. But the products of burning, mainly carbon dioxide and water have much less energy, the nbalance of the energy having been given off as light and heat.

Answer 3

Source: http://answers.yahoo.com/question/index?qid=20061215202220AAzPnII