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.
![Chapter 13
Predicting relative forward and reverse rates of reaction in a dynamic equilibrium
Hydrogen and chlorine react to form hydrogen chloride, like this:
H₂(9)+Cl₂(g) → 2 HCl(g)
Imagine 113. mmol of HCI are added to an empty flask, and then answer the following questions.
What is the rate of the reverse
reaction before any HCI has been
added to the flask?
What is the rate of the reverse
reaction just after the HCI has been
added to the flask?
Greater than zero, but less than the rate of the forward reaction.
Greater than zero, and equal to the rate of the forward reaction.
Greater than zero, and greater than the rate of the forward reaction.
Zero.
Greater than zero, but less than the rate of the forward reaction.
Greater than zero, and equal to the rate of the forward reaction.
Greater than zero, and greater than the rate of the forward reaction.
None.
Some, but less than 113. mmol.
113. mmol.
More than 113. mmol.
Using Le Chatelier's Principle to predict the result of changing concentration
What is the rate of the reverse
reaction at equilibrium?
Zero.
O Greater than zero, but less than the rate of the forward reaction.
O Greater than zero, and equal to the rate of the forward reaction.
Greater than zero, and greater than the rate of the forward reaction.
Zero.
How much HCI is in the flask at
equilibrium?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F15dd0064-ce6b-47fd-b50b-da84a4b84795%2F5ee09a7f-8acd-439b-a5f9-5027756090ac%2Fod23pm_processed.jpeg&w=3840&q=75)
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