3. a) What do you understand by the specific heat capacity of a substance? b) A lump of pure ice of mass 20 g and at a temperature of 0.0 °C is dropped into a well-insulated calorimeter (of negligible specific heat capacity) containing 210 g of alcohol at a temperature of 23.0 °C. After stirring properly, the mixture attains an equilibrium temperature of 8.4 °C. (i) State one similarity between the molecular properties of ice and alcohol (liquid). (ii) Determine the specific heat capacity of the alcohol.
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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