A reaction profile (not to scale!) for the reaction 02 + NO2 →03 + NO is shown below: E (kJ) 211 O3 + NO 200 O2 + NO2 Reaction Coordinate Which of the following are true? Choose all that apply. O ae is negative. U The energy of the products is higher than the energy of the reactants. O The reaction is endothermic. The value of Ea in the presence of a catalyst would be lower than 211 kJ. U The value of delta E in the presence of a catalyst would be smaller than 200 kJ.
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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