The table lists the specific heat values of several substances. Substance Specific heat (cal/g.°C) An unknown substance has a mass of 11.5 g. The emperature of the substance increases by 12.5 °C when 13 cal of heat is added to the substance. lead 0.031 silver 0.058 сорper 0.092 iron 0.107 aluminum 0.216 What is the most likely identity of the substance? water 1.000 silver aluminum lead iron water сорper
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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