During an exothermic reaction… A) heat released and products are lower in potential energy than reactants B) heat released and products are higher in potential energy than reactants C) heat absorbed and products are lower in potential energy than reactants D) heat absorbed and products are higher in potential energy than reactants
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.
During an exothermic reaction…
A) heat released and products are lower in potential energy than reactants
B) heat released and products are higher in potential energy than reactants
C) heat absorbed and products are lower in potential energy than reactants
D) heat absorbed and products are higher in potential energy than reactants
E) no heat transform and products are the same in potential energy with reactants
Option A is correct.
In exothermic reaction, the reaction process release an amount of heat when reactants convert to products.
Every reaction have some potential energy barrier which is needed to overcome in the process to convert from reactants to products. Both reactant and product have potential energy and the position of the their state in the energy profile diagram determine the type of reaction undergoing.
In endothermic reaction, heat absorbed from the surrounding to go from one state to another and the potential energy of the product is always higher in energy than the reactant.
In case of exothermic reaction, the potential energy of the product is lower than the reactant. Thus, the product is much stable than the reactant. The difference in energy is the heat released end of the reaction.
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