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.
![a. Use the arrows on the structure on the top left to help you derive the first resonance form. The first
resonance form should only show the electron movements indicated. Do NOT add any electron.
movements of your own. Then, draw TWO copies of this first resonance form in Box 1 AND Box 2. Each
box has the framework of the molecule pre-drawn for you.
b.
To the structure in Box 2, show TWO electron movements (2 arrows) needed to create a second
DIFFERENT resonance form. Then, draw the second resonance structure in Box 3.
Note: Your structures must show formal charges, if they are present. You are not required to show C-H
bonds, but drawing these may help you to avoid incorrect structures. The electron source for each
arrow MUST be clearly shown.
Box 3
CH₂
i
+ OH
OH
Box 1
t
CH₂
OH
Box 2
tel
OH](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F781a06bc-cf99-46ea-ba78-46177735ec7b%2F3f853cc6-38ea-42f9-b8a0-f33ed3c2f877%2Fqgvyhnk_processed.jpeg&w=3840&q=75)
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Resonance structures are the collection of Lewis structures which indicate the distribution of electrons in the polyatomic molecule or ion.
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