Question 2 Select the processes listed below that are endothermic. Indicate all that apply. (Hint: In each case, the italicized item is the system.) Ice cream melting. Water vapor condenses on grass to form dew. ✔ Solid ammonium nitrate is dissolved, causing the solution to become cool. > Gasoline is combusted in a car engine. Question 3 Which of the following variables represents a thermodynamic state function? Select all that apply. q W E H
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.
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