3. Thermite welding is an exothermic reaction, which produces molten iron that permanently binds metals as it cools. The process does not require heat or electricity. Aluminum powder is simply mixed with ferric oxide powder. The reaction is accompanied by a release of heat, and produces aluminum oxide and molten iron. The equation shows: 2 Al + Fe2O3 ®A2O3 + 2 Fe If 55.0 grams of aluminum powder is mixed with 75.0 grams of ferric oxide, which of the two substances is the limiting reagent? The excess reagent? How many grams of molten iron (Fe) will be produced?
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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