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're tasked with verifying whether or not a platinum ring bought from an online store is indeed made of platinum. After checking that the ring is not plated, but a solid piece of metal, you test the specific heat using a calorimeter. You heat up the 15.00 g ring in a water bath which is brought to a boil for 15 minutes. Then, you quickly transfer the ring into your calorimeter which has 100.0 g of water initially at 21.00 degrees Celsius. The ring and the calorimeter equilibriate at a final temperature of 21.69 degrees Celsius. According to your calorimetric test and table 2, what is the identity of the metal in the ring? The specific heat of water is 4.184 J/ (g*C).
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