Download
strength of covalent bonding chapter 8 8 n.
Skip this Video
Loading SlideShow in 5 Seconds..
Strength of Covalent Bonding Chapter 8.8 PowerPoint Presentation
Download Presentation
Strength of Covalent Bonding Chapter 8.8

Strength of Covalent Bonding Chapter 8.8

151 Views Download Presentation
Download Presentation

Strength of Covalent Bonding Chapter 8.8

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  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