Apply Hess' Law to the chemical reactions in question 2 above: Arrange equations A-C so that when they are added together, they add up to the combustion of magnesium metal to form magnesium oxide, equation D. а. Equation A: mgss +2HCI caa) → mg Clz (aa) + H2(g) Equation B: mgOis)+2HCI (aq). → mgc1 zca9) +HzO(i) Equation C: 2 f) +$0219) H2O () Equation D: b. Write an equation, using variables and not numbers, showing how the AH values for equations A-C can be combined to equal the AH value for the combustion of magnesium metal.
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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