Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![When a bond breaks, what is happening with the energy?
A
B
Energy may be released or absorbed depending
on the circumstances
с
Energy is neither released nor absorbed because
energy can neither be created nor destroyed
D
Energy is released to the surroundings
Energy is absorbed from the surroundings](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F97f79685-17c1-4ea0-ad56-64cb0ad81962%2Fb2df9bda-d735-44e8-9a9a-d1f26afb54b3%2Fhc3xx6w_processed.jpeg&w=3840&q=75)
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For breaking a bond energy is required.
That is bond breaking is an endothermic process.
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