The heat from a candy bar's Calories can raise the temperature of à 4.50 kg 10 68 C. How many Calories are in the candy bar? A 45 2 gram sample of an unknown metal has 25,533 Joules of heat added to it. If its temperature changes from 4.00°C to 733°C, what is the metal's specific heat capacity? (challenge problem) Gold has a specific heat of 0.129 J/g C. A scientist has been given a 80.0 gram coin and has been told it is pure gold. When she adds 412.8 J of heat to the coin, its temperature rises from 72 F to 144 F Is the coin actually made of gold?
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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