QUESTION 4 4.1 Consider the following table of bond length and bond energies. Bond length (pm) Bond Energy (kJ-mol") Bond C: C 134 614 C.C 154 347 Ct - Ct 199 242 266 151 4.1.1 State the definition of bond length. Use the information in the table to answer the following questions. 4.1.2 What is the relationship betwoen bond energy and bond length in a stable molecule? 4.1.3 Explain the relationship referred to in question 4.1.2. 4.1.4 Consider the CEC bond. How will the bond energy of C =C compare to that of C = C? Choose from GREATER THAN, LESS THAN or EQUAL TO. Give a reason for the answer.
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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