When Solid cacla was mixed and dissolved the temper ature went from 25.0c initiall tew seeond , What ty pe Of reaction 1s this? in a test tube with water to 38,0°C at tr a endo ther mic, exothermic, or Lom bustion?
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.
Reactions undergo classification as endothermic or exothermic based on the heat evolution/absorption. In the former, heat is getting absorbed while in the latter heat is getting released. Whereas, the reaction of any species with O2 is named as "combustion".
Given:
The initial temperature is 25 ᴼC.
The final temperature is 38 ᴼC.
Calcium chloride is an ionic compound.
It is given that when CaCl2 is dissolved in water the temperature gets increased from 25 ᴼC to 38 ᴼC.
It shows that heat is being released in the dissolution which is responsible for that temperature increase.
Hence, this reaction is characterized as an exothermic process.
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