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Strength of Covalent Bonding Chapter 8.8

Strength of Covalent Bonding Chapter 8.8. Leo Peter. Strengths of Covalent Bonds. The stability of a molecule is dependent on the strength of the covalent bonds The bond strength is determined by how much energy is required to break the bond

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Strength of Covalent Bonding Chapter 8.8

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  1. Strength of Covalent BondingChapter 8.8 Leo Peter

  2. Strengths of Covalent Bonds • The stability of a molecule is dependent on the strength of the covalent bonds • The bond strength is determined by how much energy is required to break the bond • Less energy required to break the bond = Weaker bond • The more bonds between two atoms, the closer they are together • The closer the atoms are together, the stronger the bonding • Ex:http://wps.prenhall.com/esm_brown_chemistry_9/2/667/170886.cw/index.html

  3. Bond Enthalpy and Enthalpies of Reactions • Bond enthalpy is the energy needed to break the bond between atoms • The more bonds, the higher the bond enthalpy • When a bond is made – exothermic • When a bond is broken – endothermic

  4. Enthalpies of Reactions • Cl-Cl bond energy = 242 kJ/molH-H bond energy = 436 kJ/molH-Cl bond energy = 431 kJ/mol

  5. Bond Enthalpy • Bond enthalpy = the enthalpy change = ΔH of a mole of single bonds • Ex: http://wps.prenhall.com/esm_brown_chemistry_9/2/666/170666.cw/index.html

  6. Bond Enthalpy and Bond Length • Bond length - the distance between the nuclei of the atoms involved in the bond • With an increase in the number of bonds between atoms, the bond enthalpy increases and the bond length decreases • The bond length decreases because the atoms are being held closer together

  7. Work Cited • Brown, LeMay, Bursten, Chemistry: The Central Science, Upper Saddle River, New Jersey: Pearson Education Inc., 2003 • http://www.simplechemconcepts.com/chemistry-question-energy-changes-exoendo-bond-energy/ • http://wps.prenhall.com/esm_brown_chemistry_9/2/666/170666.cw/index.html • http://wps.prenhall.com/esm_brown_chemistry_9/2/667/170886.cw/index.html

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