2) An unknown piece of metal weighing 75.00 g is heated to 100.0 °C and dropped into 250.0 g of water at room temperature (25.0 °C). When equilibrium is reached, the temperature of the water and the piece of metal is 32.0 °C. Determine the specific heat of the metal and speculate on its identity. What will be the direction of the heat flow when the metal is dropped into the water? How will the direction of heat flow affect the metal? How will it affect the water? Which sample loses heat and which sample gains heat? How does the amount of heat gained by one sample compare to the amount of heat lost by the other in magnitude and in sign? Use this knowledge to calculate the specific heat of the metal.
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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