n Section 5.6, we learned that triple bonds are stronger and shorter than single bonds. For example, a C-C single bond has an average bond energy of 347 kJ/mole, while a C = C triple bond has an average bond energy of 837 kJ/mole. Use valence bond theory to explain why a triple bond is not simply three times as strong as a single bond. O The C C triple bond is an exception. According to valence bond theory, a triple bond is generally three times as strong as a single bond. O Because according to valence bond theory, a triple bond is actually composed of two different kinds of bonds, one σ and two . O Because according to valence bond theory, a triple bond is the sharing of four electron pairs. tv AO @ X Aa
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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