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Yes, they can occur spontaneously. This can be explained by entropy (measure of randomness/dispersion in a chemical system).
For example;
NH4NO3(s) + aq --> NH4+(aq) + NO3-(aq).
The solid ammonium nitrate is converted to liquid ions. Therefore, the entropy increases, so the reaction can take place spontaneously.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoPhotosynthesis does not occur spontaneously because it's Gibbs free energy constant will always be positive. However, if a reaction increases entropy, and if temperature is high enough, its Gibbs free energy constant will be negative.
Wiki User
∙ 10y agoSpontaneous at 25 degrees C and 1 ATM, I have found the answer to be "Yes" -- does anyone know exactly why this is??
Wiki User
∙ 9y agoa.)When ΔSreaction > 0
b.)When ΔSsurroundings > 0
c.)When ΔSuniverse > 0
d.)None of the above
Wiki User
∙ 14y agoSome of them are.
Wiki User
∙ 10y agoyes which means it is endergonic
Wiki User
∙ 12y agoNo, except in the cores of stars.
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Definition of endothermic?
an endothermic reaction is any chemical reaction that absorbs heat from its environment.
Any reaction that absorbs 150 kcal of energy can be classified as?
Endothermic. Any reaction that ABSORBS energy is classified as endothermic.
What Defines an Endothermic Reaction?
An endothermic reaction need heat to begin.
What is the opposite of exothermic?
The opposite of exothermic is endothermic. Exothermic reactions are those which give off energy in the form of heat. Endothermic reactions require energy.
Effects of temperature and pressure on exothermic and endothermic reaction?
An increase in temperature favours an endothermic reaction over an exothermic one as an endothermic reaction takes in the energy from the higher temperature more easily than the exothermic reaction gives out even more energy to the surroundings. Therefore an increase in temperature increases the level of completion and viability of an endothermic reaction, and the opposite for an exothermic reaction. An increase in pressure favours any reaction that forms fewer molecules from more molecules. It does not necessarily favour an exothermic or an endothermic reaction as it depends on the number of molecules on either side of the reaction. An endothermic reaction involves the breaking of bonds to a greater extent than an exothermic reaction, so an increase in pressure would, in a lot of cases, favour the exothermic reaction more than the endothermic reaction.
Definition of endothermic?
an endothermic reaction is any chemical reaction that absorbs heat from its environment.
What is is endothermic?
if any reaction requires heat to proceed itself than the reaction is called endothermic reaction..
Any reaction that absorbs 150 kcal of energy can be classified as?
Endothermic. Any reaction that ABSORBS energy is classified as endothermic.
What is a chemical reaction that absorbs heat?
An endothermic reaction absorbs heat, an exothermic reaction releases heat.
A chemical reaction that absorbs free energy?
Can be called endothermic.
A reaction that absorbs energy is called?
Endothermic-take in Heat, as opposed to exothermic which gives off heat-like a fire or explosion.
A chemical reaction that requires a net input of energy?
"Activation Energy reactions"; Endothermic reactions require energy.
What is a non-example of an exothermic reaction?
Any endothermic reaction, for instance photosynthesis.
Chemical reaction in which heat is absorbed?
It is an endothermic reaction. An example is thermal decomposition.
Is water gas reaction endothermic?
yes it is a endothermic reaction
What kind of reaction is photosynthesis?
Photosynthesis is a Endergonic/Endothermic reaction.
What happens in an endothermic reaction?
An endothermic reaction need heat to occur.
