The heat capacity of an object depends on its mass and its composition. The heat capacity of one gram of a substance is called the Specific Heat. That is , specific heat is the amount of heat required to produce a change of 1ºC in exactly 1 g of substance. Liquid water has one of the highest specific heats known, 1 cal/g ºC or 4.184 J /g ºC . This specific heat, for example, is about 5 times as great as that of aluminum metal. Thus 1 cal of heat will increase the temperature of 1 g of aluminum by 5º C , but it raises the temperature of water by only 1ºC.
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.
The heat capacity of an object depends on its mass and its composition. The heat capacity of one gram of a substance is called the Specific Heat. That is , specific heat is the amount of heat required to produce a change of 1ºC in exactly 1 g of substance. Liquid water has one of the highest specific heats known, 1 cal/g ºC or 4.184 J /g ºC . This specific heat, for example, is about 5 times as great as that of aluminum metal. Thus 1 cal of heat will increase the temperature of 1 g of aluminum by 5º C , but it raises the temperature of water by only 1ºC.
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