2. s) In 1819, French physicists Dulong and Petit found experimentally that for many solids at room temperature, c≈ 3R (R = gas constant in SI units). Show that Dulong-Petit's rule is in agreement with the specific heat capacities of metals in the table. Explain why the specific heat capacity of magnesium is roughly twice as large as the one of titanium, and why the specific heat capacities of lead and gold are nearly identical. 3. Write the net ionic equation for the reaction between hydro- chloric acid and aqueous sodium hydroxide reaction. How would the temperature change and the calculated heat of neutralization vary if the concentration of the acid and the base used in this experiment will double? Explain.
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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