unit 3 Test - Energy in Which statement about the change in bond energy of this reaction is correct? * Reaction CH4+4C2-CCL+4HCI Reactants Products Bonds Present 4 H-C 4 C-CI 4 CHCI 4 H-CI Energy of Bonds Broken (Reactants) / Formed (Products) 4x 411 kJ/mol 4x 327 kJ/mol 4 x 242 kJ/mol 4 x 427 kJ/mol The reaction is endothermic because the total bond energy of the reactants is greater than the total bond energy of the products. The reaction is endothermic because the energy of each bond in the reactants is less than the energy of a bond in the products. The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products. The reaction is exothermic because the energy of each bond in the reactants is greater than the energy of a bond in 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.
Reaction :-
CH4 + 4Cl2 ------> CCl4 + 4HCl
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