Calculate the heat released by the reaction, qrxn: If all the heat released by the reaction was absorbed by the solution then the value of qrxn and qsolution will be the same but the sign will be opposite. A positive value for q means heat was absorbed (an endothermic process) and a negative value for q means heat was released (an exothermic process). qrxn = - Asolution What is the value of qrxn if the qsolution = 332 cal? O a. 100 cal O b. -100 cal O c. 332 cal O d. -332 cal In the previous question the qrxn was -332 cal. What does the negative sign indicate? O a. The reaction absorbed heat and was exothermic. O b. The reaction absorbed heat and was endothermic. O c. The reaction released heat and was exothermic. O d. The reaction released heat and was endothermic.
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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