CHY 103 Lecture Notes - Lecture 9: Octet Rule, Lewis Acids And Bases, Covalent Bond
6 Jun 2019
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The formation of covalent bonds is not only about sharing electrons. Strengths of covalent bonds there is an energy advantage to forming bonds. In order to judge bond strength we introduce the concept of _______________________________, s the energy required to break 1 mole of bonds in the gas phase. For diatomic molecules (such as cl2) it is fairly easy to determine the bond enthalpy. However for polyatomic molecules determining the bond enthalpy requires averaging, e. g. , In methane the heat of atomization is equal to the total bond enthalpies of the four c-h bonds. Energy is always required to break a bond. The energy of a particular bond will vary depending on its environment. The enthalpy for a reaction can be estimated by taking the sum of the bond energies broken and the bond energies formed. Calculate the bond enthalpy for the following reaction: The ______________________is defined as the distance between the nuclei of the atoms involved in the bond.
