Consider a burning candle. Reactants are the chemicals that are present before a reaction occurs while the products are the chemicals that are made by the reaction. Which of the following is true? (MARK ALL THAT APPLY) O More energy is required to start the reaction than is released by the reaction itself. O Less energy is required to start the reaction than is released by the reaction itself. O The more stored energy a substance has the less chemically stable it is. O The more stored energy a substance has the more chemically stable it is. O The reactants have less stored energy than the products. O The reactants have more stored energy than the products. O The reactants are more chemically stable than the products. O The reactants are less chemically stable than the products.
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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