The following two reduction reactions for aluminum oxide and iron (III) oxide can be combined to produce a highly exothermic redox reaction called the thermite reaction. The thermite reaction is a method of preparing molten iron from iron ore. First, balance these reactions, calculate the change in enthalpy for each and then rearrange them to produce the thermite reaction. Then use Hess’s law to determine the change in enthalpy for the thermite reaction. Al2O3(s) --> Al(s) + O2(g) ΔH = _____ kJ/rxn Fe2O3(s) --> Fe(s) + O2(g) ΔH = ____ kJ/rxn
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 following two reduction reactions for aluminum oxide and iron (III) oxide can be combined to produce a highly exothermic
Al2O3(s) --> Al(s) + O2(g) ΔH = _____ kJ/rxn
Fe2O3(s) --> Fe(s) + O2(g) ΔH = ____ kJ/rxn
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