You see a gold ring in a flea market that you’d like to have, and the price seems right, so you buy it. On the drive home you wonder if it’s really gold. You do a quick experiment and find it takes 38.7 J of heat to raise the temperature of the 6.00 g ring from 25oC to 75oC. You know that the specific heat of gold is 0.128 J/goC; is your ring really made of gold?
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.
You see a gold ring in a flea market that you’d like to have, and the price seems right, so you buy it. On the drive home you wonder if it’s really gold. You do a quick experiment and find it takes 38.7 J of heat to raise the temperature of the 6.00 g ring from 25oC to 75oC. You know that the specific heat of gold is 0.128 J/goC; is your ring really made of gold?
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