CH3CHO + 2H+ + 2e¯ → C2H5OH, with ECH, CHO =-0.19 V NAD+ + H+ + 2e¯ → NADH, with ENAD+ = -0.32 V 1. If acetaldehyde (CH3CHO) and ethanol (C2H5OH) are mixed in the presence of NAD+ and NADH, a chemical reaction starts. Use the information above to determine the balanced chemical equation for the overall reaction th occurs spontaneously. Explain how you know that your reaction proceeds spontaneously in the direction indicated in your chemical equation. 2. In the liver, the enzyme called alcohol dehydrogenase catalyzes the conversion of ethanol to acetaldehyde. If the reaction is allowed to proceed until equilibrium is established, how would the reaction mixture respond to the addition of the enzyme? Explain your reasoning.
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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